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  1. #include <stdio.h>
  2. double calculate_sum(int n) {
  3.     double sum = 0.0;
  4.     for (int k = 1; k <= n; k++) {
  5.         sum += 1.0 / (k * (k + 1)); // セミコロンを付けて修正
  6.     }
  7.     return sum;
  8. }
  9.  
  10. int main(void) {
  11.     int n1 = 3;
  12.     int n2 = 10;
  13.     double result_n1 = calculate_sum(n1);
  14.     double result_n2 = calculate_sum(n2);
  15.  
  16.     printf("x(%d) = %f\n", n1, result_n1);
  17.     printf("x(%d) = %f\n", n2, result_n2);
  18.  
  19. return 0;
  20. }
Success #stdin #stdout 0.01s 5256KB
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stdin
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Standard input is empty
stdout
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x(3) = 0.750000
x(10) = 0.909091
https://ideone.com/qRGpaG
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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