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  1. #include <iostream>
  2. #include <exception>
  3. #include <stdexcept>
  4.  
  5. int gcd(int a, int b) {
  6.     if(a<0 || b<0) {
  7.         throw std::invalid_argument("a and b must be negative values");
  8.     }
  9. 	if(a==0 || b==0)
  10. 	    return a+b;
  11. 	while(a!=b) {
  12. 	    if(a>b) {
  13. 	        a = a - b;
  14. 	    }
  15. 	    else {
  16. 	        b = b - a;
  17. 	    }
  18. 	}
  19. 	return a;
  20. }
  21.  
  22. #define expect_true(arg) \
  23.         do { \
  24.             if(!(arg)) { \
  25.             	std::cout << "Unexpected false at " \
  26.             	          << __FILE__ << ", " << __LINE__ << ", " << __func__ << ": " << #arg \
  27.             	          << std::endl; } \
  28.         } while(false);
  29.  
  30. void test_gcd() {
  31.     expect_true(gcd(16,24) == 8);
  32.     expect_true(gcd(0, 19) == 19);
  33.     bool exceptionCaught = false;
  34.     try {
  35.         gcd(5, -15);
  36.     } catch (const std::invalid_argument& ex) {
  37.         std::cout << "Illegal as expected" << std::endl;
  38.         exceptionCaught = true;
  39.     }
  40.     expect_true(exceptionCaught);
  41. }
  42.  
  43. int main() {
  44. 	test_gcd();
  45. 	return 0;
  46. }
Success #stdin #stdout 0s 3232KB
comments (?)
stdin 
Standard input is empty
stdout 
Illegal as expected
https://ideone.com/M5kWz3
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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