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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. double calculate_series(int n) {
  5.     double sum = 0.0;
  6.     for (int i = 0; i < n; i++) {
  7.         sum += pow(-1, i) / (2 * i + 1);
  8.     }
  9.     return 4 * sum;
  10. }
  11.  
  12. int main() {
  13.     int n1 = 3, n2 = 10;
  14.     printf("x(%d) = %.6f\n", n1, calculate_series(n1));
  15.     printf("x(%d) = %.6f\n", n2, calculate_series(n2));
  16.     return 0;
  17. }
  18.  
Success #stdin #stdout 0s 5284KB
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stdin
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Standard input is empty
stdout
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x(3) = 3.466667
x(10) = 3.041840
https://ideone.com/RjX0xO
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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