“Hello World,” in many languages.

I use this as a test for installing compilers on a a new machine

c

hello.c

/*DTPD*/
#include <stdio.h>
#include <stdlib.h>

int main(void) {
  printf("hello world\n");
  return 0;
}

c++

hello.cpp

/*DTPD*/
#include <iostream.h>

int main(int argc,char *argv[]) {
  cout << "hello world\n";
  return 0;
}

java

hello.java

/*DTPD*/
/**  
 * Hello World
 **/
import java.io.PrintStream;
import java.io.BufferedReader;
import java.io.InputStreamReader;

public class hello 
{
    static PrintStream cout = System.out ;
    static PrintStream cerr = System.err ;
    static BufferedReader cin =
        new BufferedReader(new InputStreamReader(System.in));
    public static void main(String[] args) 
    {
        cout.print("hello world\n");
    }
}

perl

hello.pl

#!/cygdrive/d/perl/bin/perl
## hello world test script.
#DTPD#
print "hello world \n";

python

hello.py

#!/usr/bin/python
#DTPD#
print "hello world"

scheme

hello.scm

":"; exec /bin/guile.exe -s $0 "$@" 
":"; exec /cygdrive/d/scheme/MzScheme.exe -r $0 "$@" 
;DTPD;
;; hello world testing program
(begin 
  (display "hello world")
  (newline))

shell script

hello.sh

#!/bin/bash
## hello world test script.
#DTPD#
echo "hello world"