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  1. #include <iostream>
  2. #include <cmath>
  3.  
  4. using namespace std;
  5.  
  6. // Definicja funkcji
  7. double f(double x)
  8. {
  9.     return sin(x);
  10. }
  11.  
  12. // Funkcja obliczająca całkę metodą trapezów
  13. double trapezy(double a, double b, int n)
  14. {
  15.     double h = (b - a) / n;
  16.     double suma = 0.0;
  17.  
  18.     suma += (f(a) + f(b)) / 2.0;
  19.  
  20.     for (int i = 1; i < n; i++)
  21.     {
  22.         suma += f(a + i * h);
  23.     }
  24.  
  25.     return suma * h;
  26. }
  27.  
  28. int main()
  29. {
  30.     double a = 0.0;
  31.     double b = 3.14;
  32.  
  33.     int n1 = 10;
  34.     int n2 = 100;
  35.  
  36.     double s1 = trapezy(a, b, n1);
  37.     double s2 = trapezy(a, b, n2);
  38.  
  39.     cout << "s1 (n = 10)  = " << s1 << endl;
  40.     cout << "s2 (n = 100) = " << s2 << endl;
  41.  
  42.     return 0;
  43. }
  44.  
Éxito #stdin #stdout 0.01s 5288KB
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stdin
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Standard input is empty
stdout
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s1 (n = 10)  = 1.98354
s2 (n = 100) = 1.99983
https://ideone.com/tYKM0I
lenguaje:
C++ (gcc 8.3)
created:
3 hours ago
visibilidad:
público

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