Thanks a lot! Here is the original code:

#!/usr/bin/perl
use strict;
use CGI;

print "Content-type: text/plain\n\n";   
my $q=new CGI; 
my $codes=$q->param('c_code');

    my $file = "code.cpp";
    open(FH, ">$file");      ### Must chmod Before writing,
    system("chmod 0777 code.cpp"); ### Can't create and change mode???
+?
    print FH "$codes";
    close(FH); 

&run;

exit(0);

sub run
{
    system("gcc code.cpp"); 

    system("a.out/>result.txt");  
    
    open(F,"result.txt");

    while(<F>)
    {
        print $_,"\n";
    }

    close(F);

}
[download]

Edited by Chady -- added code tags.