CODE EXAMPLE FOR CPP

GCD of 2 numbers

// Iterative Java program to
// implement Stein's Algorithm
import java.io.*;
 
class GFG {
 
    // Function to implement Stein's
    // Algorithm
    static int gcd(int a, int b)
    {
        // GCD(0, b) == b; GCD(a, 0) == a,
        // GCD(0, 0) == 0
        if (a == 0)
            return b;
        if (b == 0)
            return a;
 
        // Finding K, where K is the greatest
        // power of 2 that divides both a and b
        int k;
        for (k = 0; ((a | b) & 1) == 0; ++k)
        {
            a >>= 1;
            b >>= 1;
        }
 
        // Dividing a by 2 until a becomes odd
        while ((a & 1) == 0)
            a >>= 1;
 
        // From here on, 'a' is always odd.
        do
        {
            // If b is even, remove
            // all factor of 2 in b
            while ((b & 1) == 0)
                b >>= 1;
 
            // Now a and b are both odd. Swap
            // if necessary so a <= b, then set
            // b = b - a (which is even)
            if (a > b)
            {
                // Swap u and v.
                int temp = a;
                a = b;
                b = temp;
            }
 
            b = (b - a);
        } while (b != 0);
 
        // restore common factors of 2
        return a << k;
    }
 
    // Driver code
    public static void main(String args[])
    {
        int a = 34, b = 17;
 
        System.out.println("Gcd of given "
                           + "numbers is " + gcd(a, b));
    }
}
 
// This code is contributed by Nikita Tiwari