Program to add two numbers in CPP

#include <iostream>
using namespace std;

int main(int argc, char **argv)
{
	int x,y;
    cin >> x >> y;
    cout << x+y;
	return 0;
}

Short method to two GCD of two numbers in CPP

It comes under algorithm library of CPP so , #include<algorithm> is must to use this function.

#include<iostream>
#include<algorithm>
using namespace std;
int main() {
  int a , b;
  cin>>a>>b;
  int gcd = __gcd(a,b);
  cout<<gcd;
  return 0;
}