Create a library with following functions (prototypes are given along with a description):

- double dist (double x1, double y1, double x2, double y2); // Finds the distance between two points with coordinates (x1, y1) and (x2, y2), and returns the result.

- double slope (double x1, double y1, double x2, double y2); // Finds the slope of the line with end points (x1, y1) and (x2, y2), and returns the result.

- double angle (double x1, double y1, double x2, double y2); // Finds the angle (in degrees) that the line joining the two points makes with the x-axis.

Use the library in a program where the user is asked to enter the x and y coordinates of two points. The program calls all three functions above and outputs the results. Hint: for the angle, you can use inverse tangent of abs(y2-y1)/abs(x2-x1) where abs is the absolute value function from the library. Include the library in your own library .cpp file. Do not just output numbers. Show a message with each result.