fork download 
  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4.     double x;
  5.     int n;
  6.     scanf("%lf %d", &x, &n);
  7.  
  8.     int fact = 1;
  9.     double ans = 0, deg = x;
  10.     for (int i = 1; i <= n * 2 - 1; i += 2) {
  11.         double c = deg / fact;
  12.         if ((i / 2) % 2 == 0) {
  13.             ans += c;
  14.         } else {
  15.             ans -= c;
  16.         }
  17.         fact *= (i + 1);
  18.         fact *= (i + 2);
  19.         deg *= x * x;
  20.     }
  21.  
  22.     printf("%.6f", ans);
  23.     return 0;
  24. }
Success #stdin #stdout 0s 5324KB
comments (?)
stdin 
3.1415 1
stdout 
3.141500
https://ideone.com/9Pd8AQ
language:
C (gcc 8.3)
created:
11 hours ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!