Collinearity
June 17, 2014
Beware: today’s exercise sounds simple but is actually quite complex if you don’t look at it properly.
Your task is to write a function that takes three points in the x,y plane and determines if they are collinear; be sure to handle vertical lines and horizontal lines properly. When you are finished, you are welcome to read or run a suggested solution, or to post your own solution or discuss the exercise in the comments below.
Programming Praxis 