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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4.  
  5. double der(double x, double c[], int n)
  6. {
  7.     double d = 0;
  8.     for (int i = 0; i < n; i++)
  9.         d += pow(x, i) * c[i];
  10.     return d;
  11. }
  12.  
  13. double der2(double x, double c[], int n)
  14. {
  15.     double d = 0;
  16.     for (int i = 1; i < n; i++)
  17.         d += pow(x, i - 1) * i * c[i];
  18.     return d;
  19. }
  20.  
  21. int main()
  22. {
  23.     double coeffs[] = { 1 * 4.0, 2 * 2.0, 3 * 3.0 };
  24.     double x = 1.0;
  25.     double d = der(x, coeffs, sizeof(coeffs) / sizeof(coeffs[0]));
  26.     printf("f'(%lf) = %lf\n", x, d);
  27.  
  28.     double coeffs2[] = { 5.0, 4.0, 2.0, 3.0 };
  29.     d = der2(x, coeffs2, sizeof(coeffs2) / sizeof(coeffs2[0]));
  30.     printf("f'(%lf) = %lf\n", x, d);
  31.     return 0;
  32. }
  33.  
Success #stdin #stdout 0s 1832KB
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stdin
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Standard input is empty
stdout
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f'(1.000000) = 17.000000
f'(1.000000) = 17.000000
https://ideone.com/taJ7Ac
language:
C99 (gcc 8.3)
created:
12 years ago
visibility:
public

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