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thanks, i got rid of RE. But now i am getting WA :x . please help........

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
long long GCD(long long a,long long b)
{
if (!b) return a;
if (!a) return b;
if (a%b==0) return b;
return GCD(b,a%b);
}

int main()
{
int T,p;
scanf("%d", &T ...

Hello, i,m getting runtime error for this code. can any body point out the bug please. really need help .....

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
long long GCD(long long a,long long b)
{
if (a%b==0) return b;
return GCD(b,a%b);
}

int main()
{
int T,p;
scanf("%d", &T ...