Ledger Nano X - The secure hardware wallet
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  1. #define _USE_MATH_DEFINES
  2. #include <iostream>
  3. #include <cmath>
  4.  
  5. using namespace std;
  6.  
  7. double GetY(double x)
  8. {
  9.     //log() - взять натуральный логорифм
  10.     //pow(x,y) возвести x в y степень
  11.     return log(pow(M_E, x)) + 1;
  12.     //return 5;
  13. }
  14.  
  15. struct Prym
  16. {
  17.     public:
  18.    
  19.         double x1, x2, y;
  20.         double Square()
  21.         {
  22.             return (x2 - x1) * y;
  23.         };
  24.    
  25.         double GetX2() { return x2; }
  26.    
  27.         Prym() { x1 = 0; x2 = 0; y = 0; }
  28.    
  29.         Prym(double x1, double x2, double y)
  30.         {
  31.             this->x1 = x1;
  32.             this->x2 = x2;
  33.             this->y = y;
  34.         }
  35. };
  36.  
  37. double GetStep(double x)
  38. {
  39.     const float accuracy = 0.001f;
  40.     double step = 0;
  41.  
  42.     while (true)
  43.     {
  44.         step += 0.001;
  45.         //cout << step << endl;
  46.         if(abs( GetY(x) - GetY(x + step) ) < accuracy)
  47.         {
  48.             break;
  49.         }
  50.     }
  51.  
  52.     return step;
  53. }
  54.  
  55. int main()
  56. {
  57.     setlocale(LC_ALL, "rus");
  58.  
  59.     const float a = 0, b = 1;
  60.     double step;
  61.  
  62.     double sum;
  63.     double x = a;
  64.     step = GetStep(x);
  65.     Prym pr1 = Prym(x, x + step, GetY(x));
  66.     sum = pr1.Square();
  67.     x += step;
  68.     Prym pr2;
  69.  
  70.     while (true)
  71.     {
  72.         step = GetStep(x);
  73.         if (x + step <= b)
  74.         {
  75.             x += step;
  76.             pr2 = Prym(pr1.GetX2(), x, GetY(x));
  77.             sum += pr2.Square();
  78.             //cout << sum << endl;
  79.             pr1 = pr2;
  80.         }
  81.         else
  82.             break;
  83.     }
  84.  
  85.     cout << "Интеграл равен: " << sum;
  86. }
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