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  1. #include <iostream>
  2. #include <cmath>
  3.  
  4. int const width = 80;
  5.  
  6. class screen {
  7.   int cursor; /* for escape-sequence, now not used. */
  8.   double max;
  9. public:
  10.   screen(double max) : cursor(0), max(max) {
  11.     std::cout << std::endl;
  12.   }
  13.   ~screen() { std::cout << std::endl; }
  14.   void out(double x) {
  15.     int cx = (int)(x / max * (width / 2.0) + width / 2.0);
  16.     for (int i = 0; i < cx; i++)
  17.       std::cout << ' ';
  18.     std::cout << 'x' << std::endl;
  19.   }
  20. };
  21.  
  22. double const k = 0.05;
  23. double const u = 0.18;
  24. double const epsilon = 0.1;
  25.  
  26. class mass {
  27.   double x, v;
  28. public:
  29.   mass(double x, double v) : x(x), v(v) {}
  30.   void delta() {
  31.     double dv;
  32.     dv = -k * x + ((v < 0.0) ? +1.0 : -1.0 ) * u;
  33.     if (fabs(dv) < epsilon && fabs(v) < epsilon) v = 0.0; else v += dv;
  34.     x += v;
  35.   }
  36.   double position() { return x; }
  37. };
  38.  
  39. int const Tmax = 200;
  40. double const A = 100.0;
  41. double const v0 = 0.0;
  42. int main() {
  43.   int t;
  44.   screen screen(A);
  45.   mass m(A, v0);
  46.   for (t = 0; t < Tmax; t++) {
  47.     m.delta();
  48.     screen.out(m.position());
  49.   }
  50.   return 0;
  51. }
  52. /* end */
Success #stdin #stdout 0s 2852KB
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https://ideone.com/pLfOZ5
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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