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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4.  
  5. int main(void)
  6. {
  7.     double a,s;
  8.     int n;
  9.     scanf("%f %i",&a,&n);
  10.     s = 0;
  11.     for (int i = 0;i<=n;i++)
  12.     {
  13.         s += 1/pow(2,i);
  14.     }
  15.     printf("ans: %f",s);
  16. }
Success #stdin #stdout 0s 4520KB
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stdin
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stdout
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ans: 1.750000
https://ideone.com/E5tU2H
language:
C (gcc 8.3)
created:
4 years ago
visibility:
public

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