C Program To Check If Three Points Are On Same Straight Line

http://technotip.com/7151/c-program-to-check-if-three-points-are-on-one-straight-line/

Given three points (x1, y1), (x2, y2) and (x3, y3), write a C program to check if all the three points fall on one straight line.

Note: (x1, y1), (x2, y2) and (x3, y3) are called co-ordinates of x and y axis.

Formula To Calculate Slope of 2 points Slope of points (x1, y1) and (x2, y2) = m;

m = (y2 – y1) / (x2 – x1);

Slope of points (x2, y2) and (x3, y3) = n;

n = (y3 – y2) / (x3 – x2);

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