C/C++ code for calculating angles between of N intersections of linear equations - repost

For a given number of intersections calculate the angle between the two intersecting lines. Also create an object which adds angle data to the existing line / intersections data. You will receive as INPUT: - N number of linear equations (somewhere between 10 and 100). Note that lines with slope greater than a threshold amount will be input as X = constant. - The intersections between all lines - A hash number to represent each line You should provide as OUTPUT: - The angle between each intersection. This should be added to an object, using the above hash as the object key, which adds parameters to each intersection.