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  1. #include <iostream>
  2. #include <cmath>
  3. #include <iomanip>
  4.  
  5. using namespace std;
  6.  
  7. int main() {
  8.     double ax, ay, bx, by, px, py;
  9.     if (!(cin >> ax >> ay >> bx >> by >> px >> py)) return 0;
  10.  
  11.  
  12.     double abx = bx - ax;
  13.     double aby = by - ay;
  14.     double apx = px - ax;
  15.     double apy = py - ay;
  16.  
  17.     double dot_product = abx * apx + aby * apy;
  18.  
  19.     double distance;
  20.  
  21.     if (dot_product < 0) {
  22.         distance = sqrt(apx * apx + apy * apy);
  23.     } else {
  24.         double numerator = abs(aby * px - abx * py + bx * ay - by * ax);
  25.         double denominator = sqrt(abx * abx + aby * aby);
  26.         distance = numerator / denominator;
  27.     }
  28.  
  29.     cout << fixed << setprecision(4) << distance << endl;
  30.  
  31.     return 0;
  32. }
Success #stdin #stdout 0.01s 5284KB
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https://ideone.com/D39N7V
language:
C++ (gcc 8.3)
created:
2 days ago
visibility:
public

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