Go to Qiita Advent Calendar 2024 Top
LoginSignup
3
0

Delete article

Deleted articles cannot be recovered.

Draft of this article would be also deleted.

Are you sure you want to delete this article?

More than 5 years have passed since last update.

@yagiri000

C++Siv3D入門講座 Vol.12 演習問題(コンソール)の解答

Last updated at Posted at 2017-01-23

演習問題(コンソール)解答例

以下に演習問題(コンソール)の解答例を示す。

vol_1課題1(コンソール)

#include <iostream>

int main() {
	int input;
	std::cout << "整数値を入力してください：" << std::endl;
	std::cin >> input;//inputに入力された数値を代入
	std::cout << "入力された値は、" << input << "です。" << std::endl;

	return 0;
}

vol_1課題2(コンソール)

#include <iostream>

class Vector3 {
public:
	int x, y, z;

	// コンストラクタ
	Vector3(int _x, int _y, int _z) {
		x = _x;
		y = _y;
		z = _z;
	}

	// x, y, zの値を表示
	void show() {
		std::cout << x << "," << y << "," << z << std::endl;
	}

	// x * y * zの値を表示
	void showMultiple() {
		std::cout << x *y* z << std::endl;
	}
};

int main() {
	Vector3 vec3(1, 2, 3);
	vec3.show();
	vec3.showMultiple();

	return 0;
}

vol_3課題1(コンソール)

#include <iostream>
#include <vector>

class MyClass {
public:
	int x;

	MyClass(int _x) {
		x = _x;
	}

	void show() {
		std::cout << "xは：" << x << std::endl;
	}
};

int main() {
	std::vector<MyClass> vec;
	for (int i = 0; i < 10; i++) {
		vec.emplace_back(MyClass(rand() % 100));
	}

	for (int i = 0; i < (int)vec.size(); i++) {
		vec[i].show();
	}

	return 0;
}

vol_3課題2(コンソール)

#include <iostream>
#include <vector>

class Vector2 {
public:
	int x;
	int y;

	Vector2(int _x, int _y) {
		x = _x;
		y = _y;
	}
};

int main() {
	std::vector<Vector2> vec;
	for (int i = 0; i < 10; i++) {
		vec.emplace_back(Vector2(rand() % 100, rand() % 100));
	}

	for (int i = 0; i < (int)vec.size(); i++) {
		std::cout << vec[i].x << ", " << vec[i].y << std::endl;
	}

	return 0;
}

vol_4課題(コンソール)

#include <iostream>

void twiceRef(int &x) {
	x *= 2;
}


int main() {

	int num = 3;

	std::cout << num << std::endl;

	twiceRef(num);

	std::cout << num << std::endl;

	return 0;
}

vol_5課題1(コンソール)

#include <iostream>

int mySquare(int x) {
	std::cout << "int型のmySquareが呼ばれました" << std::endl;
	return x * x;
}

float mySquare(float x) {
	std::cout << "float型のmySquareが呼ばれました" << std::endl;
	return x * x;
}

double mySquare(double x) {
	std::cout << "double型のmySquareが呼ばれました" << std::endl;
	return x * x;
}


int main() {
	int x = 1;
	float y = 0.5;
	double z = 2.1;
	std::cout << mySquare(x) << std::endl;
	std::cout << mySquare(y) << std::endl;
	std::cout << mySquare(z) << std::endl;
}

vol_5課題2(コンソール)

#include <iostream>

class Vector2 {
public:
	int x, y;

	Vector2(int _x, int _y) :
		x(_x),
		y(_y)
	{
		std::cout << "引数ありのコンストラクタが呼ばれました" << std::endl;
	}

	Vector2() :
		x(0),
		y(0)
	{
		std::cout << "引数なしのコンストラクタが呼ばれました" << std::endl;
	}

	~Vector2() {
		std::cout << "デストラクタが呼ばれました" << std::endl;
	}
};

int main() {
	std::cout << "メイン関数に入りました" << std::endl;
	Vector2 point1;
	Vector2 point2(2, 3);
	std::cout << "メイン関数を抜けました" << std::endl;
}

vol_6課題(コンソール)

#include <iostream>
#include <vector>

class MyClass {
public:
	int a;
	int b;

	MyClass(int _a, int _b) :
		a(_a),
		b(_b)
	{
	}
};

int main() {
	std::vector<MyClass> vec;

	for (int i = 0; i < 10; i++) {
		vec.emplace_back(MyClass(rand() % 10, rand() % 10));
	}

	for (auto iter = vec.begin(); iter < vec.end(); iter++) {
		std::cout << "(" << iter->a << ", " << iter->b << "), ";
	}

	std::cout << std::endl;

	auto iter = vec.begin();
	while (iter < vec.end()) {
		if (iter->a < iter->b) {
			iter = vec.erase(iter);
		}
		else iter++;
	}

	for (auto iter = vec.begin(); iter < vec.end(); iter++) {
		std::cout << "(" << iter->a << ", " << iter->b << "), ";
	}

	std::cout << std::endl;
}

vol_7課題1(コンソール)

#include <iostream>

int main() {

	auto twice = [](int x) {
		return x * 2;
	};

	int num = 3;
	
	std::cout << twice(num) << std::endl;

	return 0;
}

vol_7課題2(コンソール)

#include <iostream>
#include <vector>
#include <algorithm>

int main() {
	std::vector<int> vec;
	
	// vectorに0から9の数を入れる
	for (int i = 0; i < 10; i++) {
		vec.emplace_back(i);
	}

	//表示
	for (auto i = vec.begin(); i < vec.end(); ++i) {
		std::cout << *i << " ";
	}
	std::cout << std::endl;

	// 2の倍数を後ろに詰め、削除
	auto rmvIter = std::remove_if(vec.begin(), vec.end(), 
		[](int i) {return i % 2 == 0; }
	);
	vec.erase(rmvIter, vec.end());

	//表示
	for (auto i = vec.begin(); i < vec.end(); ++i) {
		std::cout << *i << " ";
	}
	std::cout << std::endl;

	return 0;
}

vol_7課題3(コンソール)

#include <iostream>
#include <vector>
#include <algorithm>
#include <memory>

class MyClass {
public:
	int a;

	MyClass(int _a) :
		a(_a)
	{
	}
};


int main() {

	std::vector<MyClass> vec;

	for (int i = 0; i < 10; i++) {
		vec.emplace_back(MyClass(rand() % 10));
	}

	// vectorの中身を表示
	for (auto i = vec.begin(); i < vec.end(); i++) {
		std::cout << i->a << " ";
	}
	std::cout << std::endl;

	// vecの中から5以下のaを持つ要素を後ろに詰める
	auto rmvIter = std::remove_if(vec.begin(), vec.end(), [](const MyClass& ins) {
		return ins.a <= 5;
	});

	// 実際に削除
	vec.erase(rmvIter, vec.end());

	// vectorの中身を表示
	for (auto i = vec.begin(); i < vec.end(); i++) {
		std::cout << i->a << " ";
	}
	std::cout << std::endl;

	return 0;
}

vol_10課題(コンソール)

#include <iostream>
#include <vector>

class MyClass {
public:
	int a;

	MyClass(int _a) :
		a(_a)
	{
	}
};

int main() {
	std::vector<MyClass*> vec;

	// 適当な数でMyClassを追加
	for (int i = 0; i < 10; i++) {
		vec.emplace_back(new MyClass(rand() % 10));
	}

	// vectorの中身を表示
	for (const auto& i : vec) {
		std::cout << i->a << " ";
	}
	std::cout << std::endl;

	// 5以下の要素を削除
	auto it = vec.begin();
	while (it != vec.end()) {
		if ((*it)->a <= 5) {
			delete *it;
			it = vec.erase(it);
		}
		else {
			it++;
		}
	}

	// vectorの中身を表示
	for (const auto& i : vec) {
		std::cout << i->a << " ";
	}
	std::cout << std::endl;

	return 0;
}

vol_11課題(コンソール)

#include <iostream>
#include <vector>

class IAnimal {
public:
	double weight;//重さ

	IAnimal(int w) : weight(w) {

	}
	virtual ~IAnimal() = default;

	virtual void talk() {
		std::cout << "基底クラスのtalk関数が呼ばれました。 重さは:" << weight << std::endl;
	}

};

class Dog : public IAnimal {
public:
	Dog(int w) : IAnimal(w) {

	}

	~Dog() = default;

	void talk() override {
		std::cout << "わんわん　重さは:" << weight << std::endl;
	}
};

class Yojo : public IAnimal {
public:
	Yojo(int w) : IAnimal(w) {

	}

	~Yojo() = default;

	void talk() override {
		std::cout << "ふぇぇ…　重さは:" << weight << std::endl;
	}
};

class Cat : public IAnimal {
public:
	Cat(int w) : IAnimal(w) {

	}

	~Cat() = default;

	void talk() override {
		std::cout << "にゃー　重さは:" << weight << std::endl;
	}
};

int main() {
	std::vector<IAnimal*> animals;
	animals.emplace_back(new Dog(10));
	animals.emplace_back(new Yojo(20));
	animals.emplace_back(new Cat(30));
	
	for (const auto& animal : animals) {
		animal->talk();
	}

	return 0;
}

Vol_12課題(コンソール)

#include <iostream>
#include <vector>
#include <algorithm>
#include <memory>

class Vector2 {
public:
	int x, y;
	Vector2(int _x, int _y)
		:x(_x),
		y(_y)
	{
	}
	~Vector2() {
		std::cout << "Vector2のデストラクタが呼ばれました(x, y) = " 
			<< "(" << x << "," << y << ") " << std::endl;
	}
};

int main() {
	std::vector<std::shared_ptr<Vector2>> vec;

	// 適当な数でMyClassを追加
	for (int i = 0; i < 10; i++) {
		vec.emplace_back(std::make_shared<Vector2>(rand() % 10, rand() % 10));
	}

	// vectorの中身を表示
	for (const auto& i : vec) {
		std::cout << "(" << i->x << "," << i->y << ") ";
	}
	std::cout << std::endl;

	
	// x > yの要素を削除
	auto rmvIter = std::remove_if(vec.begin(), vec.end(), [](const std::shared_ptr<Vector2>& a) {
		return a->x > a->y;
	});
	vec.erase(rmvIter, vec.end());

	// vectorの中身を表示
	for (const auto& i : vec) {
		std::cout << "(" << i->x << "," << i->y << ") ";
	}
	std::cout << std::endl;

	return 0;
}

リンク

前の回-Vol.11 スマートポインタ・最終課題

初回-Vol.00 はじめに

3
0
1

Register as a new user and use Qiita more conveniently

  1. You get articles that match your needs
  2. You can efficiently read back useful information
  3. You can use dark theme
What you can do with signing up
Sign upLogin
3
0

Delete article

Deleted articles cannot be recovered.

Draft of this article would be also deleted.

Are you sure you want to delete this article?