Greatest Common Divisor In C++

GCD

#include <iostream.h>
#include <conio.h>
void main()
{
clrscr();
int f,s,gcd;
cout<<"enter first and second number:"; 
cin>>f>>s;
for(int i=1;i<=f && i<=s;i++)
{
if(f%i==0 && s%i==0)
{
gcd=i;
}
}
cout<<"gcd is:"<<gcd;
getch();
}

output