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  1. #include <stdio.h>
  2.  
  3.  
  4. void print_OK() {
  5. printf("OK");
  6. }
  7. void print_ERROR() {
  8. printf("ERROR");
  9. }
  10. #define OK ERROR
  11.  
  12.  
  13. int main(void) {
  14. print_OK();
  15. return 0;
  16. }
  17.  
Success #stdin #stdout 0s 5520KB
stdin
Standard input is empty
stdout
OK