10110 - Light, more light/10110-2.cpp

   1 #include <stdio.h>
   2
   3 int main()
   4
   5 {
   6    unsigned int num,i,j;
   7    char step;
   8
   9    scanf("%d",&num);
  10
  11    while (num!=0)
  12    {
  13       step=0;
  14       i=4;
  15       j=5;
  16
  17       while (num>i && i>0)
  18       {
  19          i+=j;
  20          j+=2;
  21       }
  22
  23       if (num==i) printf("yes\n");
  24       else printf("no\n");
  25       scanf("%d",&num);
  26    }
  27
  28    return 0;
  29 }