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  1. #include <iostream>
  2. #include <cmath>
  3. #include <iomanip>
  4.  
  5. using namespace std;
  6.  
  7. struct point {
  8.     long double x, y;
  9.  
  10.     // сложение
  11.     point operator+(point const &r) const {
  12.         return {x + r.x, y + r.y};
  13.     }
  14.     point &operator+=(point const &r) {
  15.         return *this = *this + r;
  16.     }
  17.  
  18.     // унарный минус
  19.     point operator-() const {
  20.         return {-x, -y};
  21.     }
  22.  
  23.     // вычитание
  24.     point operator-(point const &r) const {
  25.         return {x - r.x, y - r.y};
  26.     }
  27.     point &operator-=(point const &r) {
  28.         return *this = *this - r;
  29.     }
  30.  
  31.     // скалярное и векторное произведения
  32.     long double operator*(point const &r) const {
  33.         return x * r.x + y * r.y;
  34.     }
  35.     long double operator^(point const &r) const {
  36.         return x * r.y - r.x * y;
  37.     }
  38.  
  39.     long double argument() const {
  40.         return atan2(y, x);
  41.     }
  42.     long double length() const {
  43.         return sqrt(x * x + y * y);
  44.     }
  45.  
  46.     point rotate(long double alpha) const {
  47.         return {x * cos(alpha) - y * sin(alpha), x * sin(alpha) + y * cos(alpha)};
  48.     }
  49. };
  50.  
  51. int main() {
  52.  
  53.     ios_base::sync_with_stdio(false);
  54.     cin.tie(nullptr);
  55.     cout.tie(nullptr);
  56.  
  57.     point a{1, 1}, b{10, -12};
  58.     point c = (a + b).rotate(M_PI_2);
  59.  
  60.     cout << c.length() << ' ';
  61.     cout << fixed << setprecision(10);
  62.     cout << c.argument() << '\n';
  63.  
  64. }
  65.  
Success #stdin #stdout 0s 4308KB
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15.5563 0.7853981634
https://ideone.com/dwgFOj
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
secret

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