visual c++ programming: concepts and projects chapter 1b introduction (tutorial)

VISUAL C++ PROGRAMMING: CONCEPTS AND PROJECTS

Chapter 1BIntroduction (Tutorial)

Tutorial: Hello World!

Visual C++ Programming

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Problem Analysis When the user clicks the button “Hello

World!” appears in the textbox. Design

This program has an interface containing One button One textbox

Interface Design Sketch


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Development and Preliminary Testing


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Create a new Visual C++ project called “Hello World”

Set up the IDE so that these tabbed windows are available Solution Explorer Toolbox Properties window

Creating a New Project


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Naming and Saving the Project


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Setting up the IDE


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Development and Preliminary Testing (continued)


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Use the Toolbox to locate controls and place them on the form

Use the Properties window to change the attributes of an object

Run the program by clicking the “Start Debugging” button

Opening the Toolbox


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Select the Properties Window


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Toolbox and Properties Window


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Repositioning the Properties Window


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Positioning the Solution Explorer


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Creating textBox1


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Creating button1


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Using the Properties Window


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Changing the Text Property of button1


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Changing the Text Property of Form1


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Running Your Program


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Getting Rid of an Unnecessary Dialog Box


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Your Running Program


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Development and Preliminary Testing (continued)


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To create a click event handler double click on a button.

The Code Editor window opens and the cursor is positioned within the event handler

When you have finished entering your C++ code run the program and test it

The Code Window


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The button1_Click() Event Handler


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Example 1-1


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The Statement Completion Dropdown Box


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Completed button1_Click() Event Handler Code


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Understanding the Code


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Windows Forms Designer code Created automatically Defines the Form1 class definition Do not modify it or your program may not work

Keywords Keywords have a special meaning in Visual C+

+ and can only be used in their designated context

Keywords are automatically colored blue Example: this->BackColor See Appendix B for a list of C++ keywords

Understanding the Code (Continued)


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Control names and properties Attributes and methods belonging to a control

object are referred to using the operator (->) Example: textBox1->Text

Strings and delimiters A string of characters is designated using a

pair of quotation marks (double quotes) as delimiters

Example: “Hello World!” Strings are automatically colored maroon

Example 1-2


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Example 1-3


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Understanding the Code (Continued)


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The assignment operator (=) The value on the right side of the = operator is

assigned to the location on the left Example: textBox1->Text = “Hello World!”; In this example, the string “Hello World!” is

assigned to the Text property of textBox1 Semicolons

Almost every C++ statement is followed by a semicolon (;)

Forgetting to put in a semicolon will prevent your program from compiling

Assignment Statement


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Testing the Completed Program


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Your program should Have one button and one textbox on the

form Display “Hello World!” in the textbox

when the button is clicked

Hello World Program


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Debugging a Program


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Remove the semicolon (;) from the end of the line you entered earlier

Now run your program and look at the error messages displaying in the Output window

Find the error number and description Find the line at which the error was

detected by the compiler Fix the error and run your program again

Program Error Dialog Box


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Locating an Error


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Locating an Error Line


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On Your Own


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Change the textbox font Add more buttons Create click event handlers for the new

buttons Change the Text properties of each

button Change the textbox foreground and

background colors Change the background color of the form

Font Property in Properties Window


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Font Dialog Box


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Colored Text in textBox1


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Color Values


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Completed Project


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visual c++ programming: concepts and projects chapter 1b introduction (tutorial)

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