Standard GCD(Greatest Common Devisor)

#include<stdio.h>


int GCD(int a,int b)
{
    int c;
    while(b > 0)
    {
        c = a%b;
        a = b;  b = c;
    }
    return a;
}
int main()
{
    int i,n,a,b;
    while(scanf("%d%d",&a,&b)==2)
    {
        printf("%d\n",GCD(a,b));
    }
    return 0;
}