Hello World in Cocoa Obj-C (OS X)

#import <Foundation/Foundation.h>

int main (int argc, const char * argv[]) {
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];

    NSLog(@"Hello, World!");
    [pool release];
    return 0;
}

Hello World in Clipper

// Hello World in Clipper

? "Hello World"

Hello World in Clean

module hello

Start :: String
Start = "Hello World!\n"

!Hello World in Clarion

 PROGRAM
 
 MAP
 END
 
 CODE
 
 MESSAGE('Hello World!')
 
 RETURN

Hello World in CICS COBOL

000100        IDENTIFICATION DIVISION.                           
000200        PROGRAM-ID. HELLO.                                 
000300       * HELLO WORLD IN CICS COBOL.                        
000400        AUTHOR. ROBERT GOSLING.                            
000500        ENVIRONMENT DIVISION.                              
000600        DATA DIVISION.                                     
000700        WORKING-STORAGE SECTION.                           
000800        01 WS-DATA-AREA PIC X(80) VALUE "HELLO WORLD!".    
000900        PROCEDURE DIVISION.                                
001000            EXEC CICS SEND FROM (WS-DATA-AREA) END-EXEC.   
001100            EXEC CICS RETURN END-EXEC.