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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <math.h>
  4. #include <float.h>
  5.  
  6. #define EPSILON 1e-10
  7.  
  8. int main(void)
  9. {
  10.   int n;
  11.   double rad, ckrad, sinrad = 0.0;
  12.   double k = 1.0, l, radrad;
  13.  
  14.   printf("input rad =");
  15.   scanf("%lf", &rad);
  16.  
  17.   ckrad = l = rad;
  18.   radrad = rad * rad;
  19.  
  20.   for (n = 0; n < 5 && fabs(ckrad) >= EPSILON * sinrad; n++) {
  21.     if ((n % 2) == 0)
  22.       sinrad += ckrad;
  23.     else
  24.       sinrad -= ckrad;
  25.     k *= (2 * k + 1) * (2 * (k + 1) + 1);
  26.     l *= radrad;
  27.     ckrad = l / k;
  28.   }
  29.  
  30.  
  31.   printf("sin(rad)        = %.15lf\n", sin(rad));
  32.   printf("taylor sin(rad) = %.15lf\n", sinrad);
  33.  
  34.  
  35.   return 0;
  36. }
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https://ideone.com/GvFqB
language:
C (gcc 8.3)
created:
12 years ago
visibility:
public

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