Old+Square+numbers+Old

**Square Numbers**
Write a program which will accept as input a number, and produce as output the square of that number.

You should:


 * 1) Draw an Input-Process-Output diagram
 * 2) Draw a screen design, with labelled fields and buttons
 * 3) Produce a pseudocode design
 * 4) Write the program

Extension


 * 1) Adapt your program so that it also displays the cube of the number