paizaラーニングレベルアップ問題集の「クラス」をやってみた (1)

paizaラーニングレベルアップ問題集の「クラス」をやってみました。

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問題

クラスの作成

コンストラクタ

クラスのメンバの更新

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2問目、3問目は、前問との差分を色付けしています。

---

C

クラスの作成

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

typedef struct {
	int number;
	char name[20];
} Employee;

int getNum(const Employee* employee) {
	return employee->number;
}

const char* getName(const Employee* employee) {
	return employee->name;
}

int main() {
	int N;
	scanf("%d", &N);
	Employee** employees = NULL;
	size_t size = 0;
	while (N--) {
		char s[12];
		scanf("%s", s);
		if (!strcmp(s, "make")) {
			int number;
			char name[20];
			scanf("%d %s", &number, name);
			employees = (Employee**)realloc(employees, sizeof(Employee*) * (size + 1));
			employees[size] = (Employee*) malloc(sizeof(Employee));
			employees[size]->number = number;
			strcpy(employees[size]->name, name);
			size++;
		} else if (!strcmp(s, "getnum")) {
			size_t n;
			scanf("%zu", &n);
			n -= 1;
			printf("%d\n", getNum(employees[n]));
		} else if (!strcmp(s, "getname")) {
			size_t n;
			scanf("%zu", &n);
			n -= 1;
			printf("%s\n", getName(employees[n]));
		}
	}
	while (size) {
		free(employees[--size]);
	}
	free(employees);
	employees = NULL;
	return 0;
}

コンストラクタ

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

typedef struct {
	int number;
	char name[20];
} Employee;

+Employee* create_employee(int num, const char* name) {
+	Employee* employee = (Employee*)malloc(sizeof(Employee));
+	if (employee == NULL) {
+		abort();
+	}
+	employee->number = num;
+	strcpy(employee->name, name);
+	return employee;
+}

int getNum(const Employee* employee) {
	return employee->number;
}

const char* getName(const Employee* employee) {
	return employee->name;
}

+void destroy_employee(Employee* employee) {
+	if (employee != NULL) {
+		free(employee);
+	}
+}

int main() {
	int N;
	scanf("%d", &N);
	Employee** employees = NULL;
	size_t size = 0;
	while (N--) {
		char s[12];
		scanf("%s", s);
		if (!strcmp(s, "make")) {
			int number;
			char name[20];
			scanf("%d %s", &number, name);
			employees = (Employee**)realloc(employees, sizeof(Employee*) * (size + 1));
-			employees[size] = (Employee*) malloc(sizeof(Employee));
-			employees[size]->number = number;
-			strcpy(employees[size]->name, name);
-			size++;
+			employees[size++] = create_employee(number, name);
		} else if (!strcmp(s, "getnum")) {
			size_t n;
			scanf("%zu", &n);
			n -= 1;
			printf("%d\n", getNum(employees[n]));
		} else if (!strcmp(s, "getname")) {
			size_t n;
			scanf("%zu", &n);
			n -= 1;
			printf("%s\n", getName(employees[n]));
		}
	}
	while (size) {
-		free(employees[--size]);
+		destroy_employee(employees[--size]);
	}
	free(employees);
	employees = NULL;
	return 0;
}

クラスのメンバの更新

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

typedef struct {
	int number;
	char name[20];
} Employee;

Employee* create_employee(int num, const char* name) {
	Employee* employee = (Employee*)malloc(sizeof(Employee));
	if (employee == NULL) {
		abort();
	}
	employee->number = num;
	strcpy(employee->name, name);
	return employee;
}

int getNum(const Employee* employee) {
	return employee->number;
}

const char* getName(const Employee* employee) {
	return employee->name;
}

+void setNum(Employee* employee, int num) {
+	employee->number = num;
+}

+void setName(Employee* employee, const char* name) {
+	strcpy(employee->name, name);
+}

void destroy_employee(Employee* employee) {
	if (employee != NULL) {
		free(employee);
	}
}

int main() {
	int N;
	scanf("%d", &N);
	Employee** employees = NULL;
	size_t size = 0;
	while (N--) {
		char s[12];
		scanf("%s", s);
		if (!strcmp(s, "make")) {
			int number;
			char name[20];
			scanf("%d %s", &number, name);
			employees = (Employee**)realloc(employees, sizeof(Employee*) * (size + 1));
			employees[size++] = create_employee(number, name);
		} else if (!strcmp(s, "getnum")) {
			size_t n;
			scanf("%zu", &n);
			n -= 1;
			printf("%d\n", getNum(employees[n]));
		} else if (!strcmp(s, "getname")) {
			size_t n;
			scanf("%zu", &n);
			n -= 1;
			printf("%s\n", getName(employees[n]));
+		} else if (!strcmp(s, "change_num")) {
+			size_t n;
+			int new_num;
+			scanf("%zu %d", &n, &new_num);
+			n -= 1;
+			setNum(employees[n], new_num);
+		} else if (!strcmp(s, "change_name")) {
+			size_t n;
+			char new_name[20];
+			scanf("%zu %s", &n, new_name);
+			n -= 1;
+			setName(employees[n], new_name);
		}
	}
	while (size) {
		destroy_employee(employees[--size]);
	}
	free(employees);
	employees = NULL;
	return 0;
}

---

C++

クラスの作成

#include <iostream>
#include <vector>
using namespace std;

class Employee {
public:
    int number;
	string name;

	int getNum() const {
		return number;
	}

	string getName() const {
		return name;
	}
};

int main() {
	int n;
	cin >> n;
	vector<Employee*> employees;
	while (n--) {
		string s;
		cin >> s;
		if (s == "make") {
			Employee* employee = new Employee();
			cin >> employee->number >> employee->name;
			employees.push_back(employee);
		} else if (s == "getnum") {
			int n;
			cin >> n;
			n -= 1;
			cout << employees[n]->getNum() << endl;
		} else if (s == "getname") {
			int n;
			cin >> n;
			n -= 1;
			cout << employees[n]->getName() << endl;
		}
	}
	for (Employee* employee : employees) delete employee;
	return 0;
}

コンストラクタ

#include <iostream>
#include <vector>
using namespace std;

class Employee {
-public:
    int number;
	string name;

+public:
+	Employee(int num, string name) : number(num), name(name) {}

	int getNum() const {
		return number;
	}

	string getName() const {
		return name;
	}
};

int main() {
	int n;
	cin >> n;
	vector<Employee*> employees;
	while (n--) {
		string s;
		cin >> s;
		if (s == "make") {
-			Employee* employee = new Employee();
-			cin >> employee->number >> employee->name;
-			employees.push_back(employee);
+			int num;
+			string name;
+			cin >> num >> name;
+			employees.push_back(new Employee(num, name));
		} else if (s == "getnum") {
			int n;
			cin >> n;
			n -= 1;
			cout << employees[n]->getNum() << endl;
		} else if (s == "getname") {
			int n;
			cin >> n;
			n -= 1;
			cout << employees[n]->getName() << endl;
		}
	}
	for (Employee* employee : employees) delete employee;
	return 0;
}

クラスのメンバの更新

#include <iostream>
#include <vector>
using namespace std;

class Employee {
	int number;
	string name;

public:
	Employee(int num, string name) : number(num), name(name) {}

	int getNum() const {
		return number;
	}

	string getName() const {
		return name;
	}

+	void setNum(int num) {
+		this->number = num;
+	}

+	void setName(const string& name) {
+		this->name = name;
+	}
}

int main() {
	int n;
	cin >> n;
	vector<Employee*> employees;
	while (n--) {
		string s;
		cin >> s;
		if (s == "make") {
			int num;
			string name;
			cin >> num >> name;
			employees.push_back(new Employee(num, name));
		} else if (s == "getnum") {
			int n;
			cin >> n;
			n -= 1;
			cout << employees[n]->getNum() << endl;
		} else if (s == "getname") {
			int n;
			cin >> n;
			n -= 1;
			cout << employees[n]->getName() << endl;
+		} else if (s == "change_num") {
+			int n, num;
+			cin >> n >> num;
+			n -= 1;
+			employees[n]->setNum(num);
+		} else if (s == "change_name") {
+			int n;
+			string name;
+			cin >> n >> name;
+			n -= 1;
+			employees[n]->setName(name);
		}
	}
	for (Employee* employee : employees) delete employee;
	return 0;
}

---

C#

クラスの作成

using System;
using System.Collections.Generic;

public class Employee
{
    public int number;
    public int GetNum()
    {
        return number;
    }

    public string name;
    public string GetName()
    {
        return name;
    }
}

class Program
{
	public static void Main()
	{
		List<Employee> employees = new List<Employee>();
		for (int i = int.Parse(Console.ReadLine()); i > 0; i--) {
			string[] query = Console.ReadLine().Split();
			if ("make".Equals(query[0])) {
                Employee employee = new Employee();
				employee.number = int.Parse(query[1]);
				employee.name = query[2];
				employees.Add(employee);
			} else if ("getnum".Equals(query[0])) {
				int n = int.Parse(query[1]) - 1;
				Console.WriteLine(employees[n].GetNum());
			} else if ("getname".Equals(query[0])) {
				int n = int.Parse(query[1]) - 1;
				Console.WriteLine(employees[n].GetName());
			}
		}
	}
}

コンストラクタ

using System;
using System.Collections.Generic;

class Employee
{
-	public int number;
-	public int GetNum()
-	{
-		return number;
-	}
+	public int Number { get; }

-	public string name;
-	public string GetName()
-	{
-		return name;
-	}
+	public string Name { get; }

+	public Employee(int num, string name)
+	{
+		Number = num;
+		Name = name;
+	}
}

class Program
{
	public static void Main()
	{
		List<Employee> employees = new List<Employee>();
		for (int i = int.Parse(Console.ReadLine()); i > 0; i--) {
			string[] query = Console.ReadLine().Split();
			if ("make".Equals(query[0])) {
-				Employee employee = new Employee();
-				employee.number = int.Parse(query[1]);
-				employee.name = query[2];
-				employees.Add(employee);
+				int num = int.Parse(query[1]);
+				int name = query[2];
+				employees.Add(new Employee(num, name));
			} else if ("getnum".Equals(query[0])) {
				int n = int.Parse(query[1]) - 1;
-				Console.WriteLine(employees[n].GetNum());
+				Console.WriteLine(employees[n].Number);
			} else if ("getname".Equals(query[0])) {
				int n = int.Parse(query[1]) - 1;
-				Console.WriteLine(employees[n].GetName());
+				Console.WriteLine(employees[n].Name);
			}
		}
	}
}

クラスのメンバの更新

using System;
using System.Collections.Generic;

class Employee
{
-	public int Number { get; }
+	public int Number { get; set; }
-	public string Name { get; }
+	public string Name { get; set; }

	public Employee(int num, string name)
	{
		Number = num;
		Name = name;
	}
}

class Program
{
	public static void Main()
	{
		List<Employee> employees = new List<Employee>();
		for (int i = int.Parse(Console.ReadLine()); i > 0; i--) {
			string[] query = Console.ReadLine().Split();
			if ("make".Equals(query[0])) {
				int num = int.Parse(query[1]);
				int name = query[2];
				employees.Add(new Employee(num, name));
			} else if ("getnum".Equals(query[0])) {
				int n = int.Parse(query[1]) - 1;
				Console.WriteLine(employees[n].Number);
			} else if ("getname".Equals(query[0])) {
				int n = int.Parse(query[1]) - 1;
				Console.WriteLine(employees[n].Name);
+			} else if ("change_num".Equals(query[0])) {
+				int n = int.Parse(query[1]) - 1;
+				int num = int.Parse(query[2]);
+				employees[n].Number = num;
+			} else if ("change_name".Equals(query[0])) {
+				int n = int.Parse(query[1]) - 1;
+				string name = query[2];
+				employees[n].Name = name;
			}
		}
	}
}

---

Go

クラスの作成

package main
import "fmt"

type Employee struct {
	number int
	name   string
}

func (e *Employee) GetNum() int {
	return e.number
}

func (e *Employee) GetName() string {
	return e.name
}

func main() {
	var n int
	fmt.Scan(&n)
	employees := []*Employee{}
	for i := 0; i < n; i++ {
		var s string
		fmt.Scan(&s)
		if s == "make" {
			employee := &Employee{}
			fmt.Scan(&employee.number, &employee.name)
			employees = append(employees, employee)
		} else if s == "getnum" {
			var k int
			fmt.Scan(&k)
			k -= 1
			fmt.Println(employees[k].GetNum())
		} else if s == "getname" {
			var k int
			fmt.Scan(&k)
			k -= 1
			fmt.Println(employees[k].GetName())
		}
	}
}

コンストラクタ

package main
import "fmt"

type Employee struct {
	number int
	name   string
}

+func NewEmployee(num int, name string) *Employee {
+	return &Employee{number: num, name: name}
+}

func (e *Employee) GetNum() int {
	return e.number
}

func (e *Employee) GetName() string {
	return e.name
}

func main() {
	var n int
	fmt.Scan(&n)
	employees := []*Employee{}
	for i := 0; i < n; i++ {
		var s string
		fmt.Scan(&s)
		if s == "make" {
-			employee := &Employee{}
-			fmt.Scan(&employee.number, &employee.name)
-			employees = append(employees, employee)
+			var num int
+			var name string
+			fmt.Scan(&num, &name)
+			employees = append(employees, NewEmployee(num, name))
		} else if s == "getnum" {
			var k int
			fmt.Scan(&k)
			k -= 1
			fmt.Println(employees[k].GetNum())
		} else if s == "getname" {
			var k int
			fmt.Scan(&k)
			k -= 1
			fmt.Println(employees[k].GetName())
		}
	}
}

クラスのメンバの更新

package main
import "fmt"

type Employee struct {
	number int
	name   string
}

func NewEmployee(num int, name string) *Employee {
	return &Employee{number: num, name: name}
}

func (e *Employee) GetNum() int {
	return e.number
}

func (e *Employee) GetName() string {
	return e.name
}

+func (e *Employee) SetNum(num int) {
+	e.number = num
+}

+func (e *Employee) SetName(name string) {
+	e.name = name
+}

func main() {
	var n int
	fmt.Scan(&n)
	employees := []*Employee{}
	for i := 0; i < n; i++ {
		var s string
		fmt.Scan(&s)
		if s == "make" {
			var num int
			var name string
			fmt.Scan(&num, &name)
			employees = append(employees, NewEmployee(num, name))
		} else if s == "getnum" {
			var k int
			fmt.Scan(&k)
			k -= 1
			fmt.Println(employees[k].GetNum())
		} else if s == "getname" {
			var k int
			fmt.Scan(&k)
			k -= 1
			fmt.Println(employees[k].GetName())
+		} else if s == "change_num" {
+			var k, num int
+			fmt.Scan(&k, &num)
+			k -= 1
+			employees[k].SetNum(num)
+		} else if s == "change_name" {
+			var k int
+			var name string
+			fmt.Scan(&k, &name)
+			k -= 1
+			employees[k].SetName(name)
		}
	}
}

---

Java

クラスの作成

import java.util.*;

class Employee {
	public int number;
	public String name;

	public int getNum() {
		return number;
	}

	public String getName() {
		return name;
	}
}

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		ArrayList<Employee> employees = new ArrayList<>();
		for (int i = sc.nextInt(); i > 0; i--) {
			String s = sc.next();
			if ("make".equals(s)) {
				Employee employee = new Employee();
				employee.number = sc.nextInt();
				employee.name = sc.next();
				employees.add(employee);
			} else if ("getnum".equals(s)) {
				System.out.println(employees.get(sc.nextInt()-1).getNum());
			} else if ("getname".equals(s)) {
				System.out.println(employees.get(sc.nextInt()-1).getName());
			}
		}
		sc.close();
	}
}

コンストラクタ

import java.util.*;

class Employee {
-	public int number;
+	private int number;
-	public String name;
+	private String name;

+	public Employee(int num, String name) {
+		this.number = num;
+		this.name = name;
+	}

	public int getNum() {
		return number;
	}

	public String getName() {
		return name;
	}
}

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		ArrayList<Employee> employees = new ArrayList<>();
		for (int i = sc.nextInt(); i > 0; i--) {
			String s = sc.next();
			if ("make".equals(s)) {
-				Employee employee = new Employee();
-				employee.number = sc.nextInt();
-				employee.name = sc.next();
-				employees.add(employee);
+				employees.add(new Employee(sc.nextInt(), sc.next()));
			} else if ("getnum".equals(s)) {
				System.out.println(employees.get(sc.nextInt()-1).getNum());
			} else if ("getname".equals(s)) {
				System.out.println(employees.get(sc.nextInt()-1).getName());
			}
		}
		sc.close();
	}
}

クラスのメンバの更新

import java.util.*;

class Employee {
	private int number;
	private String name;

	public Employee(int num, String name) {
		this.number = num;
		this.name = name;
	}

	public int getNum() {
		return number;
	}

	public String getName() {
		return name;
	}

+	public void setNum(int num) {
+		this.number = num;
+	}

+	public void setName(String name) {
+		this.name = name;
+	}
}

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		ArrayList<Employee> employees = new ArrayList<>();
		for (int i = sc.nextInt(); i > 0; i--) {
			String s = sc.next();
			if ("make".equals(s)) {
				employees.add(new Employee(sc.nextInt(), sc.next()));
			} else if ("getnum".equals(s)) {
				System.out.println(employees.get(sc.nextInt()-1).getNum());
			} else if ("getname".equals(s)) {
				System.out.println(employees.get(sc.nextInt()-1).getName());
+			} else if ("change_num".equals(s)) {
+				employees.get(sc.nextInt()-1).setNum(sc.nextInt());
+			} else if ("change_name".equals(s)) {
+				employees.get(sc.nextInt()-1).setName(sc.next());
			}
		}
		sc.close();
	}
}

---

JavaScript

クラスの作成

class Employee {
	get number() {
		return this._number;
	}

	get name() {
		return this._name;
	}
}

const [N, ...S] = require("fs").readFileSync("/dev/stdin", "utf8").trim().split('\n');
const employees = [];
for (var i = 0; i < Number(N); i++) {
	const query = S[i].split(' ');
	if (query[0] === "make") {
		const employee = new Employee();
		employee._number = Number(query[1]);
		employee._name = query[2];
		employees.push(employee);
	} else if (query[0] === "getnum") {
		const n = Number(query[1]) - 1;
		console.log(employees[n].number);
	} else if (query[0] === "getname") {
		const n = Number(query[1]) - 1;
		console.log(employees[n].name);
	}
}

コンストラクタ

class Employee {
+	constructor(num, name) {
+		this._number = num;
+		this._name = name;
+	}

	get number() {
		return this._number;
	}

	get name() {
		return this._name;
	}
}

const [N, ...S] = require("fs").readFileSync("/dev/stdin", "utf8").trim().split('\n');
const employees = [];
for (var i = 0; i < Number(N); i++) {
	const query = S[i].split(' ');
	if (query[0] === "make") {
-		const employee = new Employee();
-		employee._number = Number(query[1]);
-		employee._name = query[2];
-		employees.push(employee);
+		employees.push(new Employee(Number(query[1]), query[2]));
	} else if (query[0] === "getnum") {
		const n = Number(query[1]) - 1;
		console.log(employees[n].number);
	} else if (query[0] === "getname") {
		const n = Number(query[1]) - 1;
		console.log(employees[n].name);
	}
}

クラスのメンバの更新

class Employee {
	constructor(num, name) {
		this._number = num;
		this._name = name;
	}

	get number() {
		return this._number;
	}

+	set number(value) {
+		this._number = value;
+	}

	get name() {
		return this._name;
	}

+	set name(value) {
+		this._name = value;
+	}
}

const [N, ...S] = require("fs").readFileSync("/dev/stdin", "utf8").trim().split('\n');
for (var i = 0; i < Number(N); i++) {
	const query = S[i].split(' ');
	const employees = [];
	if (query[0] === "make") {
		employees.push(new Employee(Number(query[1]), query[2]));
	} else if (query[0] === "getnum") {
		const n = Number(query[1]) - 1;
		console.log(employees[n].number);
	} else if (query[0] === "getname") {
		const n = Number(query[1]) - 1;
		console.log(employees[n].name);
+	} else if (query[0] === "change_num") {
+		const n = Number(query[1]) - 1;
+		const num = Number(query[2]);
+		employees[n].number = num;
+	} else if (query[0] === "change_name") {
+		const n = Number(query[1]) - 1;
+		const name = query[2];
+		employees[n].name = name;
	}
}

---

Kotlin

クラスの作成

class Employee(
	var number: Int = 0,
	var name: String = ""
)

fun main() {
	val employees = mutableListOf<Employee>()
	repeat (readln().toInt()) {
		val query = readln().split(' ')
		if ("make".equals(query[0])) {
			val num = query[1].toInt()
			val name = query[2]
			val employee = Employee()
			employee.number = num
			employee.name = name
			employees.add(employee)
		} else if ("getnum".equals(query[0])) {
			val n = query[1].toInt() - 1
			println(employees[n].number)
		} else if ("getname".equals(query[0])) {
			val n = query[1].toInt() - 1
			println(employees[n].name)
		}
	}
}

コンストラクタ

class Employee(
-	var number: Int = 0,
+	val number: Int,
-	var name: String = ""
+	val name: String
)

fun main() {
	val employees = mutableListOf<Employee>()
	repeat (readln().toInt()) {
		val query = readln().split(' ')
		if ("make".equals(query[0])) {
			val num = query[1].toInt()
			val name = query[2]
-			val employee = Employee()
-			employee.number = num
-			employee.name = name
-			employees.add(employee)
+			employees.add(Employee(num, name))
		} else if ("getnum".equals(query[0])) {
			val n = query[1].toInt() - 1
			println(employees[n].number)
		} else if ("getname".equals(query[0])) {
			val n = query[1].toInt() - 1
			println(employees[n].name)
		}
	}
}

クラスのメンバの更新

class Employee(
-	val number: Int,
+	var number: Int,
-	val name: String
+	var name: String
)

fun main() {
	val employees = mutableListOf<Employee>()
	repeat (readln().toInt()) {
		val query = readln().split(' ')
		if ("make".equals(query[0])) {
			val num = query[1].toInt()
			val name = query[2]
			employees.add(Employee(num, name))
		} else if ("getnum".equals(query[0])) {
			val n = query[1].toInt() - 1
			println(employees[n].number)
		} else if ("getname".equals(query[0])) {
			val n = query[1].toInt() - 1
			println(employees[n].name)
+		} else if ("change_num".equals(query[0])) {
+			val n = query[1].toInt() - 1
+			val num = query[2].toInt()
+			employees[n].number = num
+		} else if ("change_name".equals(query[0])) {
+			val n = query[1].toInt() - 1
+			val name = query[2]
+			employees[n].name = name
		}
	}
}

---

PHP

クラスの作成

<?php
	class Employee {
		public int $number;
		public string $name;
	
		public function getNum(): int {
			return $this->number;
		}
	
		public function getName(): string {
			return $this->name;
		}
	}

	$employees = [];
	$N = intval(fgets(STDIN));
	while ($N--) {
		$query = explode(' ', trim(fgets(STDIN)));
		if ($query[0] === "make") {
			$employee = new Employee();
			$employee->number = intval($query[1]);
			$employee->name = $query[2];
			$employees[] = $employee;
		} else if ($query[0] === "getnum") {
			$n = intval($query[1]) - 1;
			echo $employees[$n]->getNum(), PHP_EOL;
		} else if ($query[0] === "getname") {
			$n = intval($query[1]) - 1;
			echo $employees[$n]->getName(), PHP_EOL;
		}
	}
?>

コンストラクタ

<?php
	class Employee {
-		public int $number;
+		private int $number;
-		public string $name;
+		private string $name;
	
+		public function __construct(int $num, string $name) {
+			$this->number = $num;
+			$this->name = $name;
+		}
	
		public function getNum(): int {
			return $this->number;
		}
	
		public function getName(): string {
			return $this->name;
		}
	}

	$employees = [];
	$N = intval(fgets(STDIN));
	while ($N--) {
		$query = explode(' ', trim(fgets(STDIN)));
		if ($query[0] === "make") {
-			$employee = new Employee();
-			$employee->number = intval($query[1]);
-			$employee->name = $query[2];
-			$employees[] = $employee;
+			$num = intval($query[1]);
+			$name = $query[2];
+			$employees[] = new Employee($num, $name);
		} else if ($query[0] === "getnum") {
			$n = intval($query[1]) - 1;
			echo $employees[$n]->getNum(), PHP_EOL;
		} else if ($query[0] === "getname") {
			$n = intval($query[1]) - 1;
			echo $employees[$n]->getName(), PHP_EOL;
		}
	}
?>

クラスのメンバの更新

<?php
	class Employee {
		private int $number;
		private string $name;
	
		public function __construct(int $num, string $name) {
			$this->id = $num;
			$this->name = $name;
		}
	
		public function getNum(): int {
			return $this->number;
		}
	
		public function getName(): string {
			return $this->name;
		}
	
+		public function setNum(int $num): void {
+			$this->number = $num;
+		}
+	
+		public function setName(string $name): void {
+			$this->name = $name;
+		}
	}

	$employees = [];
	$N = intval(fgets(STDIN));
	while ($N--) {
		$query = explode(' ', trim(fgets(STDIN)));
		if ($query[0] === "make") {
			$num = intval(query[1]);
			$name = query[2];
			$employees[] = new Employee($num, $name);
		} else if ($query[0] === "getnum") {
			$n = intval(query[1]) - 1;
			echo $employees[$n]->getNum(), PHP_EOL;
		} else if ($query[0] === "getname") {
			$n = intval(query[1]) - 1;
			echo $employees[$n]->getName(), PHP_EOL;
+		} else if ($query[0] === "change_num") {
+			$n = intval($query[1]) - 1;
+			$num = intval($query[2]);
+			$employees[$n]->setNum($num);
+		} else if ($query[0] === "change_name") {
+			$n = intval($query[1]) - 1;
+			$name = $query[2];
+			$employees[$n]->setName($name);
		}
	}
?>

---

Perl

クラスの作成

package Employee;

sub new {
	my ($class) = @_;
	my $self = {
		number,
		name,
	};
	bless $self, $class;
	return $self;
}

sub getNum {
	my ($self) = @_;
	return $self->{number};
}

sub getName {
	my ($self) = @_;
	return $self->{name};
}

my @employees;
for (1..int(<STDIN>)) {
	my @query = split ' ', <STDIN>;
	if ($query[0] eq "make") {
		my $employee = Employee->new();
		$employee->{number} = int($query[1]);
		chomp($employee->{name} = $query[2]);
		push @employees, $employee; 
	} elsif ($query[0] eq "getnum") {
		my $n = int($query[1]) - 1;
		print $employees[$n]->getNum(), $/;
	} elsif ($query[0] eq "getname") {
		my $n = int($query[1]) - 1;
		print $employees[$n]->getName(), $/;
	}
}

コンストラクタ

package Employee;

sub new {
-	my ($class) = @_;
-	my $self = {
-		number,
-		name,
-	};
+	my ($class, $num, $name) = @_;
+	my $self = {
+		number => $num,
+		name => $name,
+	};
	bless $self, $class;
	return $self;
}

sub getNum {
	my ($self) = @_;
	return $self->{number};
}

sub getName {
	my ($self) = @_;
	return $self->{name};
}

my @employees;
for (1..int(<STDIN>)) {
	my @query = split ' ', <STDIN>;
	if ($query[0] eq "make") {
-		my $employee = Employee->new();
-		$employee->{number} = int($query[1]);
-		chomp($employee->{name} = $query[2]);
-		push @employees, $employee; 
+		my $num = int($query[1]);
+		chomp(my $name = $query[2]);
+		push @employees, Employee->new($num, $name); 
	} elsif ($query[0] eq "getnum") {
		my $n = int($query[1]) - 1;
		print $employees[$n]->getNum(), $/;
	} elsif ($query[0] eq "getname") {
		my $n = int($query[1]) - 1;
		print $employees[$n]->getName(), $/;
	}
}

クラスのメンバの更新

package Employee;

sub new {
	my ($class, $num, $name) = @_;
	my $self = {
		number => $num,
		name => $name,
	};
	bless $self, $class;
	return $self;
}

sub getNum {
	my ($self) = @_;
	return $self->{number};
}

sub getName {
	my ($self) = @_;
	return $self->{name};
}

+sub setNum {
+	my ($self, $num) = @_;
+	$self->{number} = $num;
+}
+
+sub setName {
+	my ($self, $name) = @_;
+	$self->{name} = $name;
+}

my @employees;
for (1..int(<STDIN>)) {
	my @query = split ' ', <STDIN>;
	if ($query[0] eq "make") {
		my $num = int($query[1]);
		chomp(my $name = $query[2]);
		push @employees, Employee->new($num, $name); 
	} elsif ($query[0] eq "getnum") {
		my $n = int($query[1]) - 1;
		print $employees[$n]->getNum(), $/;
	} elsif ($query[0] eq "getname") {
		my $n = int($query[1]) - 1;
		print $employees[$n]->getName(), $/;
+	} elsif ($query[0] eq "change_num") {
+		my $n = int($query[1]) - 1;
+		my $num = $query[2];
+		$employees[$n]->setNum($num), $/;
+	} elsif ($query[0] eq "change_name") {
+		my $n = int($query[1]) - 1;
+		chomp(my $name = $query[2]);
+		$employees[$n]->setName($name), $/;
	}
}

---

Python3

クラスの作成

class Employee:
	def get_number(self) -> int:
		return self.number

	def get_name(self) -> str:
		return self.name


employees = []
for _ in range(int(input())):
	query = input().split()
	if query[0] == "make":
		employee = Employee()
		employee.number = int(query[1])
		employee.name = query[2]
		employees.append(employee)
	elif query[0] == "getnum":
		n = int(query[1]) - 1
		print(employees[n].get_number())
	elif query[0] == "getname":
		n = int(query[1]) - 1
		print(employees[n].get_name())

コンストラクタ

class Employee:
+	def __init__(self, num: int, name: str):
+		self._number = num
+		self._name = name

-	def get_number(self) -> int:
-		return self.number
+	@property
+	def number(self) -> int:
+		return self._number

-	def get_name(self) -> str:
-		return self.name
+	@property
+	def name(self) -> str:
+		return self._name


employees = []
for _ in range(int(input())):
	query = input().split()
	if query[0] == "make":
-		employee = Employee()
-		employee.number = int(query[1])
-		employee.name = query[2]
-		employees.append(employee)
+		num, name = int(query[1]), query[2]
+		employees.append(Employee(num, name))
	elif query[0] == "getnum":
		n = int(query[1]) - 1
-		print(employees[n].get_number())
+		print(employees[n].number)
	elif query[0] == "getname":
		n = int(query[1]) - 1
-		print(employees[n].get_name())
+		print(employees[n].name)

クラスのメンバの更新

class Employee:
	def __init__(self, num: int, name: str):
		self._number = num
		self._name = name

	@property
	def number(self) -> int:
		return self._number

+	@number.setter
+	def number(self, value: int):
+		self._number = value

	@property
	def name(self) -> str:
		return self._name

+	@name.setter
+	def name(self, value: str):
+		self._name = value


employees = []
for _ in range(int(input())):
	query = input().split()
	if query[0] == "make":
		num, name = int(query[1]), query[2]
		employees.append(Employee(num, name))
	elif query[0] == "getnum":
		n = int(query[1]) - 1
		print(employees[n].number)
	elif query[0] == "getname":
		n = int(query[1]) - 1
		print(employees[n].name)
+	elif query[0] == "change_num":
+		n, num = int(query[1]) - 1, int(query[2])
+		employees[n].number = num
+	elif query[0] == "change_name":
+		n, name = int(query[1]) - 1, query[2]
+		employees[n].name = name

---

Ruby

クラスの作成

class Employee
	attr_writer :number, :name
	
	def getNumber
		@number
	end

	def getName
		@name
	end
end

employees = []
gets.to_i.times do
	query = gets.chomp.split
	if query[0] == "make"
		employee = Employee.new
		employee.number = query[1].to_i
		employee.name = query[2]
		employees << employee
	elsif query[0] == "getnum"
		n = query[1].to_i - 1
		p employees[n].getNumber
	elsif query[0] == "getname"
		n = query[1].to_i - 1
		puts employees[n].getName
	end	
end

コンストラクタ

class Employee
-	attr_writer :number, :name
+	attr_reader :number, :name

+	def initialize(num, name)
+		@number = num
+		@name = name
+	end

-	def getNumber
-		@number
-	end

-	def getName
-		@name
-	end
end

employees = []
gets.to_i.times do
	query = gets.chomp.split
	if query[0] == "make"
-		employee = Employee.new
-		employee.number = query[1].to_i
-		employee.name = query[2]
-		employees << employee
+		num = query[1].to_i
+		name = query[2]
+		employees << Employee.new(num, name)
	elsif query[0] == "getnum"
		n = query[1].to_i - 1
-		p employees[n].getNumber
+		p employees[n].number
	elsif query[0] == "getname"
		n = query[1].to_i - 1
-		puts employees[n].getName
+		puts employees[n].name
	end	
end

クラスのメンバの更新

class Employee
-	attr_reader :number, :name
+	attr_accessor :number, :name

	def initialize(num, name)
		@nnumber = num
		@name = name
	end
end

employees = []
gets.to_i.times do
	query = gets.chomp.split
	if query[0] == "make"
		num = query[1].to_i
		name = query[2]
		employees << Employee.new(num, name)
	elsif query[0] == "getnum"
		n = query[1].to_i - 1
		p employees[n].number
	elsif query[0] == "getname"
		n = query[1].to_i - 1
		puts employees[n].name
+	elsif query[0] == "change_num"
+		n = query[1].to_i - 1
+		num = query[2].to_i
+		employees[n].number = num
+	elsif query[0] == "change_name"
+		n = query[1].to_i - 1
+		name = query[2]
+		employees[n].name = name
	end	
end

---

Scala

クラスの作成

import scala.io.StdIn._
import scala.collection.mutable._

class Employee() {
	var number: Int = 0
	var name: String = null

	def getNum(): Int = { number }
	def getName(): String = { name }
}

object Main extends App{
	val employees = ArrayBuffer[Employee]()
	for (_ <- 0 until readInt()) {
		val query = readLine().split(' ')
		if ("make".equals(query(0))) {
			val employee = new Employee()
			employee.number = query(1).toInt
			employee.name = query(2)
			employees += employee
		} else if ("getnum".equals(query(0))) {
			val n = query(1).toInt - 1
			println(employees(n).getNum())
		} else if ("getname".equals(query(0))) {
			val n = query(1).toInt - 1
			println(employees(n).getName())
		}
	}
}

コンストラクタ

import scala.io.StdIn._
import scala.collection.mutable._

-class Employee() {
-	var number: Int = 0
-	var name: String = null
-
-	def getNum(): Int = { number }
-	def getName(): String = { name }
-}
+case class Employee(val number: Int, val name: String)

object Main extends App{
	val employees = ArrayBuffer[Employee]()
	for (_ <- 0 until readInt()) {
		val query = readLine().split(' ')
		if ("make".equals(query(0))) {
-			val employee = new Employee()
-			employee.number = query(1).toInt
-			employee.name = query(2)
-			employees += employee
+			val num = query(1).toInt
+			val name = query(2)
+			employees += new Employee(num, name)
		} else if ("getnum".equals(query(0))) {
			val n = query(1).toInt - 1
-			println(employees(n).getNum())
+			println(employees(n).number)
		} else if ("getname".equals(query(0))) {
			val n = query(1).toInt - 1
-			println(employees(n).getName())
+			println(employees(n).name)
		}
	}
}

クラスのメンバの更新

import scala.io.StdIn._
import scala.collection.mutable._

-case class Employee(val number: Int, val name: String)
+case class Employee(var number: Int, var name: String)

object Main extends App{
	val employees = ArrayBuffer[Employee]()
	for (_ <- 0 until readInt()) {
		val query = readLine().split(' ')
		if ("make".equals(query(0))) {
			val num = query(1).toInt
			val name = query(2)
			employees += new Employee(num, name)
		} else if ("getnum".equals(query(0))) {
			val n = query(1).toInt - 1
			println(employees(n).number)
		} else if ("getname".equals(query(0))) {
			val n = query(1).toInt - 1
			println(employees(n).name)
+		} else if ("change_num".equals(query(0))) {
+			val n = query(1).toInt - 1
+			val num = query(2).toInt
+			employees(n).number = num 
+		} else if ("change_name".equals(query(0))) {
+			val n = query(1).toInt - 1
+			val name = query(2)
+			employees(n).name = name 
		}
	}
}

---

Swift

クラスの作成

class Employee {
	public var number: Int = 0
	public var name: String = ""

	func getNum() -> Int {
		return number
	}

	func getName() -> String {
		return name
	}
}

var employees: [Employee] = []
for _ in 0..<Int(readLine()!)! {
	let query = readLine()!.split(separator: " ")
	if query[0] == "make" {
		let employee = Employee()
		employee.number = Int(query[1])!
		employee.name = String(query[2])
		employees.append(employee)
	} else if query[0] == "getnum" {
		let n = Int(query[1])! - 1
		print(employees[n].getNum())
	} else if query[0] == "getname" {
		let n = Int(query[1])! - 1
		print(employees[n].getName())
	}
}

コンストラクタ

class Employee {
-	public var number: Int = 0
+	let number: Int
-	public var name: String = ""
+	let name: String

+	init(num: Int, name: String) {
*		self.number = num
*		self.name = name
*	}

-	func getNum() -> Int {
-		return number
-	}

-	func getName() -> String {
-		return name
-	}
}

var employees: [Employee] = []
for _ in 0..<Int(readLine()!)! {
	let query = readLine()!.split(separator: " ")
	if query[0] == "make" {
-		let employee = Employee()
-		employee.number = Int(query[1])!
-		employee.name = String(query[2])
-		employees.append(employee)
+		let num = Int(query[1])!
+		let name = String(query[2])
+		employees.append(Employee(num: num, name: name))
	} else if query[0] == "getnum" {
		let n = Int(query[1])! - 1
-		print(employees[n].getNum())
+		print(employees[n].number)
	} else if query[0] == "getname" {
		let n = Int(query[1])! - 1
-		print(employees[n].getName())
+		print(employees[n].name)
	}
}

クラスのメンバの更新

class Employee {
-	let number: Int
+	var number: Int
-	let name: String
+	var name: String

	init(num: Int, name: String) {
		self.number = num
		self.name = name
	}
}

var employees: [Employee] = []
for _ in 0..<Int(readLine()!)! {
	let query = readLine()!.split(separator: " ")
	if query[0] == "make" {
		let num = Int(query[1])!
		let name = String(query[2])
		employees.append(Employee(num: num, name: name))
	} else if query[0] == "getnum" {
		let n = Int(query[1])! - 1
		print(employees[n].number)
	} else if query[0] == "getname" {
		let n = Int(query[1])! - 1
		print(employees[n].name)
+	} else if query[0] == "change_num" {
+		let n = Int(query[1])! - 1
+		let num = Int(query[2])!
+		employees[n].number = num
+	} else if query[0] == "change_name" {
+		let n = Int(query[1])! - 1
+		let name = String(query[2])
*		employees[n].name = name
	}
}