数学趣题——棋盘放麦粒

   1: #include <stdio.h>

   2: #include <math.h>

   3:  

   4: int main()

   5: {

   6:     double sum = 0;

   7:     int i;

   8:     for (i = 1; i <= 64; ++i)

   9:     {

  10:         sum += pow(2, i-1);

  11:     }

  12:     printf("the sum is \n%f\n", sum);

  13:  

  14:     return 0;

  15: }