The fill in the blanks part is good. That is how some of the early assignments I did at Uni worked.

If the problem is "Write a program to print the integers from 0 to 9, modify this program":

#include <stdio.h>

main {
  int i;

  for (i = 0; i < 10; i++) {
    /* You're code here */
  }
}
[download]

Okay, that's a really simple one, but you get the idea... I assume that the Comp Sci department at my old Uni (VUW) is the only one that does that...

Cheers!