
#include <stdio.h>
#include <stdlib.h>
int num (int i,int j);
void pri (int num);
int main()
{
int t;
while (1)
{
printf ("Input a number\n");
scanf ("%d",&t);
int j=2;
pri (num (t,j));
}
return 0;
}
void pri (int num)
{
if (num)
printf ("The number is sushu\n");
else
printf ("The number isn't sushu\n");
}
int num (int i,int j)
{
return ((i==j || i==j-1) ? 1 :((i%j==0) ? 0 : (num (i,j+1))));/*判断质数*/
}



