Assignment #1 Task #2

Please note, this blog entry is from a previous course. You might want to check out the current one.

Your calculator already works with floating point numbers (e.g. if you touch the buttons 3 Enter 4 / it will properly show the resulting value of 0.75), however, there is no way for the user to enter a floating point number. Remedy this. Allow only legal floating point numbers to be entered (e.g. “192.168.0.1” is not a legal floating point number). Don’t worry too much about precision in this assignment.

Add an additional button on the left hand side of the zero button, by copying one of the number buttons. Add a new property userIsInTheMiddleOfEnteringAFloat to CalculatorViewController.m, synthesize it and adjust the digitPressed andenterPressed functions:
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Assignment #1 Task #1

Please note, this blog entry is from a previous course. You might want to check out the current one.

The first assignment is an extension of the calculator built in lecture #2.

Follow the walk-through instructions (separate document) to build and run the calculator in the iPhone Simulator. Do not proceed to the next steps unless your calculator functions as expected and builds without warnings or errors.

Basically this is solved by code at the end of lecture #2. However, limited time during the lecture prevented the instructor from finishing everything, thus we have to add subtraction and division as operands to CalculatorBrain.m:
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