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  1. #include <iostream>
  2. #include <cmath>
  3.  
  4. using namespace std;
  5.  
  6. double trapezy(double a, double b, int n)
  7. {
  8.     double h = (b - a) / n;
  9.     double suma = 0.0;
  10.  
  11.     // suma wartości wewnętrznych
  12.     for (int i = 1; i < n; i++)
  13.     {
  14.         double x = a + i * h;
  15.         suma += sin(x);
  16.     }
  17.  
  18.     // wzór metody trapezów
  19.     suma = (sin(a) + sin(b)) / 2 + suma;
  20.     return suma * h;
  21. }
  22.  
  23. int main()
  24. {
  25.     double a1 = 0.0, b1 = 3.14;
  26.     double a2 = 0.0, b2 = 3.14;
  27.     int n1 = 10, n2 = 100;
  28.  
  29.     double s1 = trapezy(a1, b1, n1);
  30.     double s2 = trapezy(a2, b2, n2);
  31.  
  32.     cout << "s1 (n = 10)  = " << s1 << endl;
  33.     cout << "s2 (n = 100) = " << s2 << endl;
  34.  
  35.     return 0;
  36. }
  37.  
Success #stdin #stdout 0s 5284KB
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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/ttvmAU
language:
C++ (gcc 8.3)
created:
3 hours ago
visibility:
public

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