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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. typedef double db;
  5.  
  6. struct Point
  7. {
  8.     double x, y;
  9. };
  10.  
  11. struct Quadrilateral
  12. {
  13.     struct Point a, b, c, d;
  14. };
  15.  
  16. void Which_Quad(Quadrilateral q);                       // determine quad type
  17. db det_side(Point p, Point q);                          // determine side length
  18. db det_slope(db x1, db y1, db x2, db y2, db x3, db y3); // determine slope
  19.  
  20. int main()
  21. {
  22.     Quadrilateral q;
  23.     scanf("%lf%lf", &q.a.x, &q.a.y);   
  24.     scanf("%lf%lf", &q.b.x, &q.b.y);
  25.     scanf("%lf%lf", &q.c.x, &q.c.y);   
  26.     scanf("%lf%lf", &q.d.x, &q.d.y);
  27.  
  28.     Which_Quad(q);
  29.  
  30.     return 0;
  31. }
  32.  
  33. void Which_Quad(Quadrilateral q)
  34. {
  35.     db side1 = det_side(q.a, q.b);
  36.     db side2 = det_side(q.b, q.c);
  37.     // cout<<q.b.x<<" "<<q.b.y<<" "<<q.c.x<<" "<<q.c.y<<" "<<side2<<" "<<endl;
  38.     db side3 = det_side(q.c, q.d);
  39.     db side4 = det_side(q.d, q.a);
  40.  
  41.     if (side1 == side2 and side2 == side3 and side3 == side4 and side4 == side1)
  42.     {
  43.         if (det_slope(q.a.x, q.a.y, q.b.x, q.b.y, q.d.x, q.d.y) == -1)
  44.         {
  45.             printf("Square\n");
  46.             return;
  47.         }
  48.         else
  49.         {
  50.             printf("Rhombus\n");
  51.             return;
  52.         }
  53.     }
  54.     else if (side1 == side3 and side2 == side4)
  55.     {
  56.         if (det_slope(q.a.x, q.a.y, q.b.x, q.b.y, q.d.x, q.d.y) == -1)
  57.         {
  58.             printf("Rectangular\n");
  59.             return;
  60.         }
  61.         else
  62.         {
  63.             printf("Parallelogram\n");
  64.             return;
  65.         }
  66.     }
  67.     else
  68.     {
  69.         printf("Other\n");
  70.         return;
  71.     }
  72. }
  73.  
  74. db det_side(Point p, Point q)
  75. {
  76.     db side;
  77.     side = sqrt(((p.x - q.x) * (p.x - q.x)) + ((p.y - q.y) * (p.y - q.y)));
  78.     // cout<<side<<endl;
  79.     return side;
  80. }
  81.  
  82. db det_slope(db x1, db y1, db x2, db y2, db x3, db y3)
  83. {
  84.     if (((y2 - y1) == 0 and (x3 - x1) == 0) or ((x2 - x1) == 0 and (y3 - y1) == 0))
  85.     {
  86.         return -1;
  87.     }
  88.     else
  89.     {
  90.         db slope = (((y2 - y1) * (y3 - y2)) / ((x2 - x1) * (x3 - x2)));
  91.         return slope;
  92.     }
  93. }
Success #stdin #stdout 0.01s 5468KB
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Rectangular
https://ideone.com/vTGrkC
language:
C++14 (gcc 8.3)
created:
1 year ago
visibility:
public

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