ip地址判断

#include <stdio.h>
int main()
{    int n, a, b, c, d;   
 scanf("%d", &n);   
 while(n--){   
     scanf("%d.%d.%d.%d", &a, &b, &c, &d);     
     if (a < 0 || b < 0 || c < 0 || d < 0 || a > 255 || b > 255 || c > 255 || d > 255)      
         printf("No!\n");   
     else     
         printf("Yes!\n");    
 } 
 return 0;
}