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Software ==>	Visual C# (55 exercises)
Topic ==>	C# variables (3 exercises)
Level ==>	Average difficulty
Subject ==>	C# training

Display the sum of numbers entered in a calculator using variables

This exercise is provided to allow potential course delegates to choose the correct Wise Owl Microsoft training course, and may not be reproduced in whole or in part in any format without the prior written consent of Wise Owl.

Before you can do this exercise, you'll need to download and unzip this file .

Press CTRL + D to add the file called frmCalculator.cs from the above folder into your project (or right click on the project and choose to add it as an existing item).

Change your project's properties to make this the default form for your project. When you run your project, you should see a (very) basic calculator, which doesn't yet work.

Double-click on the Calculate button to create an event-handler for it. In this event-handler, firstly use a Try ... Catch clause to check that you can read the two numbers entered into integer variables:

Calculator with non-integers

If a user has typed non-integer values into either of the boxes, as here, you should display an error message like the one shown and exit out of the subroutine.

If both of the numbers have been entered correctly, display the result in your event-handler:

Calculator with integers

Here clicking on the Calculate button should update the answer to 741,being the sum of 317 and 424.

Now you just need to add multiplication, division, subtraction, sines, cosines, hyperbolic sines, square roots ...

You can unzip this file to see the answers to this exercise, although please remember this is for your personal use only.

You can find other training resources for the subject of this exercise here:

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