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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 dx = (b - a) / n;
  9.     double s = 0.0;
  10.     double x = a;
  11.  
  12.     for (int i = 1; i <= n; i++)
  13.     {
  14.         s = s + dx * sin(x);
  15.         x = x + dx;
  16.     }
  17.  
  18.     return s;
  19. }
  20.  
  21. int main()
  22. {
  23.     double a1 = 0.0;
  24.     double b1 = 3.14;
  25.     int n1 = 10;
  26.  
  27.     double a2 = 0.0;
  28.     double b2 = 3.14;
  29.     int n2 = 100;
  30.  
  31.     double s1 = trapezy(a1, b1, n1);
  32.     double s2 = trapezy(a2, b2, n2);
  33.  
  34.     cout << "s1 (n = 10)  = " << s1 << endl;
  35.     cout << "s2 (n = 100) = " << s2 << endl;
  36.  
  37.     return 0;
  38. }
Success #stdin #stdout 0.01s 5244KB
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Standard input is empty
stdout
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s1 (n = 10)  = 1.98329
s2 (n = 100) = 1.99981
https://ideone.com/IhUwhE
language:
C++ (gcc 8.3)
created:
8 hours ago
visibility:
public

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