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  1. #include <iostream>
  2. #include <utility>
  3.  
  4. using namespace std;
  5.  
  6. typedef pair<int,int> point;
  7.  
  8. int SegmentsAreParallel(const point & i, const point & j, const point & k)
  9. {
  10.     int dx1, dy1, dx2, dy2;
  11.  
  12.     dx1 = j.first - i.first;
  13.     dy1 = j.second - i.second;
  14.  
  15.     dx2 = k.first - i.first;
  16.     dy2 = k.second - i.second;
  17.  
  18.     return dx1 * dy2 - dy1 * dx2 == 0;
  19. }
  20.  
  21. int main()
  22. {
  23.   point p1(0, 0);
  24.   point p2(1, 1);
  25.   point p3(2, 2);
  26.   point p4(-1, -1);
  27.   point p5(1, -1);
  28.   point p6(0, 10);
  29.   point p7(0, 100);
  30.   point p8(10, 0);
  31.   point p9(100, 0);
  32.  
  33.   cout << SegmentsAreParallel(p1, p2, p3) << endl;
  34.   cout << SegmentsAreParallel(p1, p2, p4) << endl;
  35.   cout << SegmentsAreParallel(p1, p2, p5) << endl;
  36.   cout << SegmentsAreParallel(p1, p6, p7) << endl;
  37.   cout << SegmentsAreParallel(p1, p8, p9) << endl;
  38.   cout << SegmentsAreParallel(p1, p6, p9) << endl;
  39.  
  40.   return 0;
  41. }
  42.  
Success #stdin #stdout 0s 2852KB
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https://ideone.com/NS6MSU
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
public

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