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  1. #include <stdio.h>
  2.  
  3. int isCpp()
  4. {
  5. #ifdef true
  6. #undef true
  7. #endif
  8.  
  9. #if true
  10.     return 1;
  11. #else
  12.     return 0;
  13. #endif
  14. }
  15.  
  16. int main(void)
  17. {
  18.     if (isCpp()) {
  19.         puts("C++");
  20.     } else {
  21.         puts("C");
  22.     }
  23.     return 0;
  24. }
  25.  
Success #stdin #stdout 0s 9424KB
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C
https://ideone.com/Ym6ptI
language:
C (gcc 8.3)
created:
7 years ago
visibility:
public

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