各种语言的第一课：Hello world!

Bash:

#!/bin/sh
echo "Hello, World!"

C:

 

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

C++:

1、

#include<cstdio>
int main()
{
    printf("Hello world!");
}

2、

#include<iostream>
using namespace std;
int main()
{
    cout<<"Hello world!";
}

C#:

using System;
 
class Program
{
    static void Main()
    {
        Console.WriteLine("Hello, World!");
    }
}

Java:

public class HelloWorld {
    public static void main(String[] args) {
        System.out.println("Hello, World!");
    }
}

Dart:

void main() {
  print('Hello, World!');
}

python:

print("Hello, World!")

GO:

package main
 
import "fmt"
 
func main() {
    fmt.Println("Hello, World!")
}

COBOL:

IDENTIFICATION DIVISION.
PROGRAM-ID. HELLO-WORLD.
PROCEDURE DIVISION.
    DISPLAY "Hello, World!"
    STOP RUN.

SQL: 

CREATE TABLE message (text char(15));
INSERT INTO message (text) VALUES ('Hello, World!');
SELECT text FROM message;
DROP TABLE message;

Lisp: 

(write-line "Hello, World!")

 Ruby:

puts 'Hello, World!'

D:

import std.stdio;
 
void main () {
  writefln("Hello, World!");
}

Rust:

fn main() {
    println("Hello, World!");
}

swift:

print("Hello, World!")

JavaScript:

document.write('Hello, World!');

PHP:

<? echo "Hello, World!" ?>

Groovy: 

println "Hello, World!"

Clojure:

(println "Hello, World!")

Objective-C 

#import <Foundation/Foundation.h>
 
int main() {
    @autoreleasepool {
        NSLog(@"Hello, World!");
    }
}