gcd in cpp code example

Example 1: how to find hcf in c++

// C++ program to find GCD of two numbers 
#include <iostream> 
using namespace std; 
// Recursive function to return gcd of a and b 
int gcd(int a, int b) 
{ 
	if (b == 0) 
		return a; 
	return gcd(b, a % b); 
	
} 

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

Example 2: gcd function in c++

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); 
}

Example 3: gcd in c++

#include<iostream>
using namespace std;

int euclid_gcd(int a, int b) {
	if(a==0 || b==0) return 0;
	int dividend = a;
	int divisor = b;
	while(divisor != 0){
		int remainder = dividend%divisor;
		dividend = divisor;
		divisor = remainder;
	}
	return dividend;
}

int main()
{
	cout<<euclid_gcd(0,7)<<endl;
	cout<<euclid_gcd(55,78)<<endl;
	cout<<euclid_gcd(105,350)<<endl;
	cout<<euclid_gcd(350,105)<<endl;
	return 0;
}

Example 4: std::gcd

cout << __gcd(17, 97) << endl; //#include <algorithm>