The Calculator_manual provides an interface with two key features. a) The entry window; that allows the user to type the operation that needs to be performed. b) The result just below the window.

The Calculator_gui is a more advanced design that replicates the simple calculator. It provides the user with: a) all the numbers; b) all the simple arithmetic operators and c) an entry window for the user to see the operation performed within it.

Use these calculators anywhere on the go with your systems.