2) Problem E5.12 from the textbook. (Distance between two points in a 2-dimensional space, etc.) E5.12 Write mctions double distance (double x1, double x2, double yl, double y2) void midpoint (double X1, double X2, double yl, double y2, double& xmid, double& ymid) void slope (double x1 , double x2 , double yl , double y2 , bool& vertical , double& 5) that compute the distance, midpoint, and slope of the line segment joining the points (x1, yl) and (x2, y2). The slope function should either set vertical to true and not set s, or set vertical to false and set s to the slope