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  1. #include <iostream>
  2. #include <exception>
  3. #include <stdexcept>
  4.  
  5. int gcd(int a, int b) {
  6. 	// Trigger to fail the test case
  7.     if(a<0 /* || b<0 */ ) {
  8.         throw std::invalid_argument("a and b must be negative values");
  9.     }
  10.     if(!(a >= 0 && b >= 0)) {
  11.     	return -1;
  12.     }
  13. 	if(a==0 || b==0 )
  14. 	    return a+b;
  15. 	while(a!=b) {
  16. 	    if(a>b) {
  17. 	        a = a - b;
  18. 	    }
  19. 	    else {
  20. 	        b = b - a;
  21. 	    }
  22. 	}
  23. 	return a;
  24. }
  25.  
  26. #define expect_true(arg) \
  27.         do { \
  28.             if(!(arg)) { \
  29.             	std::cout << "Unexpected false at " \
  30.             	          << __FILE__ << ", " << __LINE__ << ", " << __func__ << ": " << #arg \
  31.             	          << std::endl; } \
  32.         } while(false);
  33.  
  34. void test_gcd() {
  35.     expect_true(gcd(16,24) == 8);
  36.     expect_true(gcd(0, 19) == 19);
  37.     bool exceptionCaught = false;
  38.     try {
  39.         gcd(5, -15);
  40.     } catch (const std::invalid_argument& ex) {
  41.         std::cout << "Illegal as expected" << std::endl;
  42.         exceptionCaught = true;
  43.     }
  44.     expect_true(exceptionCaught);
  45. }
  46.  
  47. int main() {
  48. 	test_gcd();
  49. 	return 0;
  50. }
Success #stdin #stdout 0s 3100KB
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Standard input is empty
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Unexpected false at prog.cpp, 44, test_gcd: exceptionCaught
https://ideone.com/OCjiLZ
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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