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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. double x(int n) {
  5.     double sum = 1.0; 
  6.     int i;
  7.     for (i = 1; i < n; i++) { 
  8.         sum += pow(-1, i) / (2 * i + 1); 
  9.     }
  10.     return 4 * sum;
  11. }
  12.  
  13. int main() {
  14.     int n1 = 3, n2 = 10;
  15.     printf("x(%d) = %lf\n", n1, x(n1));
  16.     printf("x(%d) = %lf\n", n2, x(n2));
  17.     return 0;
  18. }
  19.  
Success #stdin #stdout 0s 5280KB
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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/dDiuV6
language:
Objective-C (gcc 8.3)
created:
8 days ago
visibility:
public

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