分数之和。

#include <stdio.h>
  2 
  3 int main()
  4 {
  5     int p,q,r,s,count = 0;
  6 
  7     printf("The 4 fractions which sum is equal are:\n");
  8 
  9     for(p = 2;p < 5;p++)
 10     {
 11         for(q = p;q < 7;q++)
 12         {
 13             for(r = q;r < 13;r++)
 14             {
 15                 if(p * q * r - q * r - p * r - p * q != 0)
 16                 {
 17                     s=(p * q * r) / (p * q * r - q * r - p * r - p * q);
 18 
 19                     if( !((p * q * r) % (p * q * r - q * r - p * r - p * q)) && s >= r)
 20                     {
 21                         printf("[%2d] 1/%d + 1/%d + 1/%d + 1/%d = 1\n",++count,p,q,r,s);
 22                     }
 23                 }
 24             }
 25         }
 26     }
 27     return 0;
 28 }