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  1. #include <stdlib.h>
  2. #include <unistd.h>
  3. #include <stdio.h>
  4.  
  5. int main(int argc, char **argv)
  6. {
  7. volatile int modified;
  8. char buffer[64];
  9.  
  10. modified = 0;
  11. gets(buffer);
  12.  
  13. if(modified != 0) {
  14. printf("you have changed the 'modified' variable\n");
  15. } else {
  16. printf("Try again?\n");
  17. }
  18. }