i;main(j){char s[999];gets(s);for(;s[i];i++)for(j=0;j<=i;j++)putchar(s[i]);}
hello world
heelllllllooooo wwwwwwwoooooooorrrrrrrrrllllllllllddddddddddd
The brand new service which powers Ideone!
Widget for compiling and running the source code in a web browser!