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  1. #include <iostream>
  2. #include <cmath>
  3.  
  4. double f(double x)
  5. {
  6.     return sin(x);   // funkcja podcałkowa
  7. }
  8.  
  9. double prostokaty(double a, double b, int n)
  10. {
  11.     double dx = (b - a) / n;
  12.     double x = a;
  13.     double s = 0.0;
  14.  
  15.     for (int i = 1; i <= n; i++)
  16.     {
  17.         x = x + dx;
  18.         s = s + dx * f(x);
  19.     }
  20.  
  21.     return s;
  22. }
  23.  
  24. int main()
  25. {
  26.     double a1 = 0.0, b1 = 3.14;
  27.     int n1 = 10;
  28.  
  29.     double a2 = 0.0, b2 = 3.14;
  30.     int n2 = 100;
  31.  
  32.     double s1 = prostokaty(a1, b1, n1);
  33.     double s2 = prostokaty(a2, b2, n2);
  34.  
  35.     std::cout << "s1 (n=10)  = " << s1 << std::endl;
  36.     std::cout << "s2 (n=100) = " << s2 << std::endl;
  37.  
  38.     return 0;
  39. }
  40.  
Success #stdin #stdout 0.01s 5316KB
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stdin
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Standard input is empty
stdout
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s1 (n=10)  = 1.98379
s2 (n=100) = 1.99986
https://ideone.com/hedoR0
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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