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  1. /* Here is the function declaration (aka header
  2.  * or prototype) of `function2` */
  3. void function2 (int a, int b);
  4.  
  5. /* Here are the function definitions */
  6. void function1 (int c, int d)
  7. {
  8.     if (c < d)
  9.         function2 (c, d);
  10. }
  11.  
  12. void function2 (int a, int b)
  13. {
  14.     if (a > b)
  15.         function1 (a, b);
  16. }
');