In this image $($from ch$.8-$ equivalence partitioning$)$ the large shaded ellipse on the left represents the set of all possible inputs to the program that is being tested. The smaller unshaded ellipses represent equivalence partitions. A program being tested should process all of the members of an input equivalence partition in the same way.

Develop an example program of equivalence partitioning. Provide all the necessary components $($see image above$)$ and provide a brief summary.