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1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 What are the two major components within the Visual Basic programming development system What two primary activities are required when creating a Visual Basic program What is an event What is an event procedure In Visual Basic, what is a form In Visual Basic, what is meant by controls Name some common controls. What are objects Name some common Visual Basic objects. What are object properties Name some common properties of Visual Basic objects. In Visual Basic, what is meant by a method Describe the principal steps involved in the Visual Basic project development process.
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1.10 Most computer programs involve what three major tasks 1.11 Open up Visual Basic on your computer. Then identify each of the following: (a) Title Bar (b) Menu Bar (c) Drop-down menus (d) Standard Toolbar
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(e) Form Design Window (f) Project Container Window (g) Toolbox (h) Properties Window (i) (j) (l) Project Window Code Editor Window Immediate Window
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1.12 Summarize how each of the following operations is carried out: (a) Repositioning (relocating) a window (b) Resizing a window (c) Deleting (closing) a window (d) Adding a new window 1.13 What is meant by docking a window How is window docking is carried out 1.14 How is an existing Visual Basic project opened 1.15 How is a Visual Basic project saved 1.16 How is a Visual Basic project executed How is the project paused during execution How is it resumed How is the execution ended 1.17 How is the on-line help feature accessed
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1.18 Re-create the project given in Example 1.1 using your own version of Visual Basic. Verify that the project executes correctly. Then change the project in the following ways: (a) Change the label captions to Enter the radius below: and The area is:. (b) Change the background colors of the form and the text boxes. (Choose your own colors.) (c) Change the command button captions to Execute and Quit. (d) Raise the lower label and the lower text box so that they are closer to the upper label and text box. (e) Move the command buttons to the bottom of the form and align them horizontally. (f) Resize the form and rearrange the controls relative to one another so that the form has an overall pleasing appearance. (g) Access the on-line help for the Val function (select Index/Val function from the Help menu). Then do the same with the Str function. 1.19 Modify the project given in Example 1.1 so that it calculates both the area and the circumference of a circle from the given value of the radius. Display each calculated value in a separate text box. Experiment with the project so that it runs correctly and has a pleasing appearance. Access the on-line help feature to obtain assistance with programming details.
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Visual Basic Fundamentals
In this chapter we will consider several fundamental features of Visual Basic, such as numbers, strings, data types and variables. We will then consider some fundamental Visual Basic features that will allow us to form numerical expressions, manipulate strings, assign data to variables and add remarks to a program. We will also discuss the use of library functions, which simplify various numerical and string manipulation operations. After completing this chapter, you will be able to write a variety of Visual Basic commands (also referred to as statements) for simple problem situations.
2.1 NUMERIC CONSTANTS Numbers are referred to as numeric constants in Visual Basic. Most numeric constants are expressed as integers (whole numbers that do not contain a decimal point or an exponent), long integers (similar to integers with an extended range), single-precision real quantities (numbers that include a decimal point, an exponent, or both), or double-precision real quantities (similar to single-precision real quantities with an extended range and greater precision). The following rules apply to numeric constants: 1. 2. 3. 4. 5. Commas cannot appear anywhere in a numeric constant. A numeric constant may be preceded by a + or a sign. The constant is understood to be positive if a sign does not appear. An integer constant occupies two bytes. It must fall within the range 32,768 to 32,767. It cannot contain either a decimal point or an exponent. A long integer constant occupies four bytes. It must fall within the range 2,147,483,648 to 2,147,483,647. It cannot contain either a decimal point or an exponent. A single-precision real constant occupies four bytes. It can include a decimal point and as many as seven significant figures. However, its magnitude cannot exceed approximately 3.4 1038. A single-precision real constant can include an exponent if desired. Exponential notation is similar to scientific notation, except that the base 10 is replaced by the letter E. Thus, the quantity 1.2 10 3 could be written as 1.2E 3. The exponent itself can be either positive or negative, but it must be a whole number; i.e., it cannot contain a decimal point. A double-precision real constant occupies eight bytes. It can include a decimal point and as many as fifteen significant figures. However, its magnitude cannot exceed approximately 1.8 10308. A double-precision real constant can include an exponent if desired. Double-precision exponential notation is similar to scientific notation, except that the base 10 is replaced by the letter D. Thus, the quantity 1.6667 10-3 could be written as 1.6667D 3. The exponent itself can be either positive or negative, but it must be a whole number; i.e., it cannot contain a decimal point.
All of the numeric constants discussed above are based upon the decimal (base 10) numbering system. Visual Basic also supports octal (base 8) and hexadecimal (base 16) numeric constants, though octal and hexadecimal constants are rarely used by beginning programmers. Hence, we will not work with octal or hexadecimal constants in this book.
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