数学趣题——判断回文数字

   1: #include <string.h>

   2: #include <stdio.h>

   3:  

   4: int IsCircle(int n);

   5: int Reverse(int i);

   6:  

   7: int main()

   8: {

   9:     int n;

  10:     printf("input a number\n");

  11:     scanf("%d", &n);

  12:  

  13:     if (IsCircle(n))

  14:         printf("%d is Circle\n", n);

  15:     else

  16:         printf("%d is not Circle\n", n);

  17:     return 0;

  18: }

  19:  

  20: int IsCircle(int n)

  21: {

  22:     int m;

  23:     m = Reverse(n);

  24:     if (m == n)

  25:         return 1;

  26:     else

  27:         return 0;

  28: }

  29:  

  30: int Reverse(int i)

  31: {

  32:     int m, j=0;

  33:     m = i;

  34:     while (m)

  35:     {

  36:         j = j*10 + m%10;

  37:         m = m/10;

  38:     }

  39:  

  40:     return j;

  41: }