TheAlgorithms-C-Plus-Plus/math/greatest_common_divisor.cpp

// C++ program to find GCD of two numbers
#include <iostream>

// Recursive function to return gcd of a and b
int gcd(int a, int b) {
    // Everything divides 0
    if (a == 0)
       return b;
    if (b == 0)
       return a;

    // base case
    if (a == b)
        return a;

    // a is greater
    if (a > b)
        return gcd(a-b, b);
    return gcd(a, b-a);
}

// Driver program to test above function
int main() {
    int a = 98, b = 56;
    std::cout << "GCD of " << a << " and " << b << " is " << gcd(a, b);
    return 0;
}