![]() ![]() ![]() We are going to have to declare some variables on the form to make our calculator work like a standard calculator. Make sure you sort out the Text so that your buttons look like the ones in the screenshot. Copy and paste one of your digit buttons and add four buttons to the form. Now we need to add the buttons to do the arithmetic. We can hide this by clicking on the minus sign to the left of the procedure name. Save and test that there is now a limit on the number of digits that can be entered.įor now, we have finished with the code we need for the digit buttons. We can do this by adding an IF statement to the code we have just written. It would be sensible to limit the number of digits that can be entered to say, 10. Step 8Ĭalculators can't work with super huge numbers and ours will be no exception. Save and test your program to make sure that all of the buttons behave as they should. We need one line of code, lblDisplay.Text = lblDisplay.Text + sender.Text The cursor will be blinking away in the place we are going to need to write our code. Look for the event named click and double click in the empty box to the right of it.Ī code window should appear with something like you see in the screenshot. We want to look at events - so click on the lightning symbol. Start by selecting all of your buttons - you can do this by drawing a selection rectangle around them all. ![]() Clicking on a button will add the number that is on the button into the display. It makes quite a difference to how easy your application will be to use if you lay the buttons out neatly as you see in the screenshot. Then you should have something like this,Īt this point you have a sense of how large the form needs to be and can tidy up the size. Don't forget to sort out their names and text. Change the font, size and colour until you are happy.Ĭopy and paste your 7 button until you have buttons for all of the digits 0-9. Change its name to btnSeven and its text to 7. Start by adding one of the number buttons, say the 7 button. Our next job is to add the number buttons. You should be able to do this by looking in the properties window when you have the label selected on the form. You will also need to add a border to the label, set its background colour to white, remove the text and make the text right aligned. Then look for the property called Autosize. Start by looking in the properties window and choosing a font and size you like. Notice when you first make it, however large you try to make it, it will shrink to the size it needs to be to display the text Label1. The user can't enter text directly in here so the best thing for us to use is a label. The large box at the top is to display the numbers we enter and the answer to any calculations we make. There is a button for each of the digits from 0-9, one for the decimal point, one for equals and a button for each of the arithmetical operations (+-*/) that we want to do. Most of the things in the sketch are buttons. Step 2Ĭhange a few properties on the form to make it look more like a calculator program - change the Text to Calculator and change the FormBorderStyle to FixedToolWindow.Ī quick sketch helps us think about the features we should see in a calculator program - we'll start with the simplest things. From now on you can just click the Save All button to ensure you have saved your work. ![]() Pingback: C# Program that read array display the smallest integer and sort the array in ascending order by using Array.Sort method.Launch Visual Basic and create a new Windows Forms Application called Calculator. Pingback: Write a C# program to demonstrate the multiple inheritances Pingback: C# program that defines a class to represent a bank account which includes the following member Pingback: Develop a C# app that will determine the gross pay for each of three employees Pingback: Write a C# program that reads two arrays and checks whether they are equal. Pingback: Write a C# program to create a static function factorial and calculate factorial of the number. Pingback: C# program to count vowels in a string Pingback: C# Program Create a class student with a data members name and calculate marks and percentage. Pingback: C# Program that Subtracts two user defined numbers Code:Ĭonsole.WriteLine(“Area of Rectangle = ” +(width * length)) Ĭonsole.WriteLine("Area of Rectangle = " +(width * length)) Ĭ++ projects for beginners with source codeġ2 thoughts on “C# Program Calculating the Area of a Rectangle” Depending upon the design, it may need ways for accepting the values of these attributes, calculating the area, and displaying details. It has attributes such as length and width. Object: Let us consider a Rectangle object. ![]()
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