Gcd core dumped

#1

hi,
pls have a look ,it is showing core dumped

#2

Hi u have to check for the last modulo to be equal to 0 not 1 since at the end gcd is going to divide a and give modulo 0.
Just a made a few changes please look.

#include<iostream>
using namespace std;

long long int gcd(long long int a,long long int b)
{
	if(a==0)
	return b;
	return gcd(b%a,a);
}
int main() {
	long long int a,b,c;
	cin>>a;
	cin>>b;
    if(a>b)swap(a,b);
	c=gcd(a,b);
	cout<<c;

	return 0;
}