A C++ program to find GCD of two number using function.

GCDNumber.cpp

#include<iostream>
#include<conio.h>

using namespace std;

int gcd(int x,int y);

int main()
{
 int a,b;
 cout<<"Enter two number : ";cin>>a>>b;
 cout<<"\nThe GCD of "<<a<<" and "<<b<<" is "<<gcd(a,b);
 getch();
 return(0);
}

int gcd(int x,int y)
{
 int z=x%y;
 if(z==0)
 return(y);
 else
 return(gcd(y,z));
}