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  1. #include <iostream>
  2. #include <cstdlib>
  3.  
  4. using namespace std;
  5.  
  6. int gcd_iterations(int a, int b, int iters){
  7. 	if (b > a){
  8. 		return gcd_iterations(b, a, iters+1);
  9. 	}
  10. 	int r = a % b;
  11. 	if (r == 0){
  12. 		return iters;
  13. 	} else {
  14. 		return gcd_iterations(b, r, iters + 1);
  15. 	}
  16. }
  17.  
  18. int main() {
  19.     int loops = 30000;
  20.     int i, sum, a, b;
  21.  
  22.     sum = 0;
  23.     for (i = 0; i < loops; i++)
  24.     {
  25.     	a = rand();
  26.     	b = rand();
  27.     	sum += gcd_iterations(a, b, 1);
  28.     }
  29.     float avg;
  30.     avg = (float) sum / (float) loops;
  31. 	cout << avg << endl;
  32. 	cout << "sample inputs: " << a << " and " << b << endl;
  33. 	cout << "Bits of an int " << sizeof(int) * 8 << endl;
  34.     a = 1836311903;
  35.     b = 1134903170;
  36.     cout << "Iterations at F44, F43 " << gcd_iterations(a, b, 1) << endl;
  37. 	return 0;
  38. }
Success #stdin #stdout 0.01s 3296KB
comments (?)
stdin 
Standard input is empty
stdout 
18.1799
sample inputs: 1057513700 and 1721671889
Bits of an int 32
Iterations at F44, F43 44
https://ideone.com/u1aZV6
GCD iteration counter
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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