c++ - Odd APPCRASH error in GCD program? -

using namespace std; #include <iostream> int gcd(int a, int b){     while(b!=0){         int temp=b;         b=a%b;         a=temp;     }     return a; } int main(){     int a=0, b=0;     cout<<"please enter 2 integers find gcd using euclidean algorithm.";     cin>>a>>b;     cout<<"the greatest common divisor of "<<a<<" , "<<b<<" "<<gcd(a,b)<<"."; } 

this simple c++ program finds greatest common divisor of 2 numbers, , runs fine. however, if change

int gcd(int a, int b){     while(b!=0){ 

into while(a!=0){, experience appcrash error, exception code c0000094 kills run. running c++11 iso standards , ide code::blocks 16.

you have "division 0" error.

demonstration:

#include <iostream>  using namespace std;  int gcd(int a, int b) {   while (a != 0) {     int temp = b;      if (b == 0)     {       cout << "divison 0\n";       return 0;     }      b = % b;     = temp;   }   return a; }  int main() {   int = 0, b = 0;   cout << "please enter 2 integers find gcd using euclidean algorithm.";   cin >> >> b;   cout << "the greatest common divisor of " << << " , " << b << " " << gcd(a, b) << "."; } 

input:

5 5 

disclaimer: program demonstrates there "division 0" error, still not correct.