OJ Board

i have tested many case.
this code have passed successfully.
but got WA.


#include <stdio.h>
char prime(int n)
{
int a;
char re;
double remainder;
for(a=2; a<n; a++)
{
remainder=n%a;
if(remainder==0)
{
break;
}
}
if(remainder==0)
{
re = 'n';
}
else
{
re='p';
}

return re ...