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  1. #include <iostream>
  2. #include <cmath>
  3.  
  4. using namespace std;
  5.  
  6. double f(double x)
  7. {
  8.     return sin(x);
  9. }
  10.  
  11. double prostokaty(double a, double b, int n)
  12. {
  13.     double dx = (b - a) / n;
  14.     double x = a;
  15.     double s = 0.0;
  16.  
  17.     for (int i = 1; i <= n; i++)
  18.     {
  19.         x = x + dx;
  20.         s = s + dx * f(x);
  21.     }
  22.  
  23.     return s;
  24. }
  25.  
  26. int main()
  27. {
  28.     double a = 0.0;
  29.     double b = 3.14;
  30.  
  31.     double s1 = prostokaty(a, b, 10);
  32.     double s2 = prostokaty(a, b, 100);
  33.  
  34.     cout << "S1 (n = 10)  = " << s1 << endl;
  35.     cout << "S2 (n = 100) = " << s2 << endl;
  36.  
  37.     return 0;
  38. }
  39.  
Success #stdin #stdout 0.01s 5288KB
comments (?)
stdin 
Standard input is empty
stdout 
S1 (n = 10)  = 1.98379
S2 (n = 100) = 1.99986
https://ideone.com/OeQAec
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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