Hello world

public class Zhu{
    public static void mian(String[] args){
        System.out.printf("Hello world");
    }

Java:

public class Zhu{
    public static void mian(String[] args){
        System.out.printf("Hello world");
    }

C:

#include <stdio.h>
int main(void){
    printf("Hello world!");
    return 0;
}

C++:

#include<iostream>
int mian(){
    cout<<"Hello,world!"<<endl;
    return 0;
}

Objective-C:

#import <Foundation/Foundation.h>
int main(int argc, const char * argv[]){
    @autoreleasepool {
        NSLog(@"Hello, World!");
    }
    return 0;
}

Python：

print("Hello,World!");

Swfit:

println("Hello,world");