Calculator Application Development Process

(1) Use cases + Variables tables

First we need to think about the inputs and outputs (=> the use cases).

Then we think about variables and how we use them for the use cases.

The following tables illustrate two use cases (11+11= and 011+10=). 

Step 1) Fill up the input column, then think and decide the outputs (textBoxOutput.Text) [for simplicity, use the windows calculator to determine the output]

Step 2) Think about the variables to be used and how they should be use for the use cases.  Leave a few empty columns for adding more variables later on.

(2) flowcharts for “0”, “1”, “+” and “=” (partial)

Next, we use the variables table to draft our flowcharts:

(3) Coding for “0”, “1”, “+” and “=” (partial)

Use the previous exercise 3.2 where we have completed the following GUI and start coding:

Happy coding and debugging …