Problem
Write a C program that is able to compute areas of circles, given the radius of the circle.
Use three macros:
one that defines Pi
another one that computes the area, i.e. a macro that resembles a function
the number of RUNS, see below
Have the user input a radius, upon which the area is computed.
Use a for-loop in order to go through a number of configurable RUNS, which will also be defined in a macro, i.e. called RUNS. For your submission, set RUNS to 5.