数学趣题——填数字游戏

   1: #include <stdio.h>

   2:  

   3: int Reverse(int i)

   4: {

   5:     int r = 0;

   6:     while (i)

   7:     {

   8:         r = r * 10 + i % 10;

   9:         i = i / 10;

  10:     }

  11:     return r;

  12: }

  13:  

  14: int fun(int i, int j)

  15: {

  16:     int buf[4], k = 0;

  17:     while (i)

  18:     {

  19:         buf[k] = i % 10;

  20:         i = i / 10;

  21:         k++;

  22:     }

  23:  

  24:     if(buf[0]!=buf[1] && buf[0] != buf[2] && buf[0] != buf[3] && buf[0] != j)

  25:         if(buf[1] != buf[2] && buf[1]!= buf[3] && buf[1] != j)

  26:             if(buf[2] != buf[3] && buf[2] != j)

  27:                 if(buf[3] != j)

  28:                     return 1;

  29:  

  30:     return 0;

  31: }

  32:  

  33: int main()

  34: {

  35:     int i,j;

  36:     for(i=1000; i<10000; i++)

  37:         for(j=1; j<10; j++)

  38:             if (i * j == Reverse(i) && fun(i, j))

  39:             {

  40:                 printf("%d\n", i);

  41:                 printf("*  %d\n", j);

  42:                 printf("----\n");

  43:                 printf("%d\n\n", i * j);

  44:             }

  45:     return 0;

  46: }