C :

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

C++ :

#include<iostream>
using namespace std;
int main()
{
	cout<<"Hello World!";
	return 0;
}

Pascal :

begin
writeln('Hello world!');
end.

FreeBasic :

Begin
 writeln('*****************************');
 writeln('':7,'Hello world!');
 writeln('*****************************');
End.