回文数

 1 //题目：一个5位数，判断它是不是回文数。即12321是回文数，个位与万位相同，十位与千位相同。　

 2 #include <stdio.h>

 3 

 4 int main()

 5 {

 6     int num=0;

 7     printf("please input a int num:");

 8     do{

 9         if(num!=0)

         {

             if(num<10000)

                 printf("so,input a bigger one:");

             else 

                 printf("so ,input a smaller one:");

         }

         scanf("%d",&num);

     }while(num>99999||num<10000);

 

     if((num/10000==num%10) && (num/1000%10==num%100/10))

         printf("Yes,it is!\n");

 

     else 

         printf("No,it isn't!\n");

 

     return 0;

 }