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  1. #include <stdio.h>
  2.  
  3. int main() {
  4.     int n;
  5.     double sum = 0.0;
  6.     double term = 1.0;
  7.  
  8.     printf("Enter the value of n: ");
  9.     scanf("%d", &n);
  10.  
  11.     for (int i = 0; i <= n; i++) {
  12.         sum += term;
  13.         term /= 2;  // each term is 1 / 2^i
  14.     }
  15.  
  16.     printf("Sum of the series is: %lf\n", sum);
  17.  
  18.     return 0;
  19. }
  20.  
Success #stdin #stdout 0s 5312KB
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Enter the value of n: Sum of the series is: 2.000000
https://ideone.com/LGEPGy
language:
C++14 (gcc 8.3)
created:
17 hours ago
visibility:
public

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