auto generate barcode vb net Here is a variation of Example 3.16, illustrating the use of a typical Exit Do statement. in Visual Studio .NET

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EXAMPLE 3.19
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Here is a variation of Example 3.16, illustrating the use of a typical Exit Do statement.
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sum = 0 count = 1 Do While count <= 10 sum = sum + count If sum >= 10 Then Exit Do count = count + 1 Loop
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3.8 LOOPING WITH While-Wend Visual Basic supports While-Wend structures in addition to Do-Loop structures. This structure also permits conditional looping. The structure begins with the While statement (analogous to Do While), and ends with the Wend statement (analogous to Loop). The general form of a While-Wend structure is
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While logical expression . . . . . . . .
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. . . . . . . . Wend
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Control can be transferred out of a Do-Loop block using the Exit Do statement. This statement is analogous to Exit For, which is used with For-Next blocks. Thus, when an Exit Do statement is encountered during program execution, control is transferred out of the Do-Loop block to the first executable statement following Loop.
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BRANCHING AND LOOPING
[CHAP. 3
The loop created by the While-Wend structure continues to execute as long as the logical expression is true. Thus, While-Wend is analogous to a Do While-Loop structure. Note that the logical expression is tested at the beginning of each pass through the loop. The While-Wend structure, like the Do-While structure, does not involve a formal index. Therefore, you must assign an initial value to the logical expression before entering the loop. This value will then be altered within the loop, in accordance with the program logic.
EXAMPLE 3.20
Here is a While-Wend loop that is comparable to the Do-While loop in Example 3.18.
sum = 0 count = 1 While count <= 10 sum = sum + count count = count + 1 Wend
3.9 THE Stop STATEMENT The Stop statement is used to terminate the execution at any point in the program. The statement consists simply of the keyword Stop. This statement may appear anywhere in a Visual Basic program except at the very end. Multiple Stop statements may appear in the same program, as dictated by the program logic. However, modern programming practice tends to avoid the use of the Stop statement.
Review Questions
3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 What is meant by selection What is branching How does branching differ from selection What is looping What is the difference between unconditional looping and conditional looping Name the six relational operators used in Visual Basic. What is the purpose of each What is a logical expression What values can a logical expression take on What are operands within a logical expression What is the interpretation of the relational operators <, <=, > and >= when applied to string operands Name the three commonly used logical operators in Visual Basic. What is the purpose of each What other logical operators are available in Visual Basic What is the purpose of the If-Then statement What is the purpose of an If-Then-Else block Compare with the If-Then statement. How is an If-Then-Else block ended
3.9 3.10 3.11
CHAP. 3]
BRANCHING AND LOOPING
3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 3.20 3.21 3.22
Describe how one If-Then-Else block can be embedded within another. What is the purpose of the Select Case structure Summarize the principal components of the Select Case structure. Which are required and which are optional For what type of application is the Select Case structure well-suited Can the expression in a Select Case structure be based upon a string rather than a numeric value How are multiple data items handled in a single Case statement How is a range of data items handled in a Case statement How is a logical expression handled in a Case statement What is the purpose of the For-Next structure What is the purpose of the Step clause within this structure How is a For-Next structure ended What is the index in a For-Next structure In what way must the index appearing in the For-To statement be related to the index appearing in the Next statement Can the index in a For-Next structure take on fractional values Can it decrease in value from one pass to another Summarize the rules that apply to For-Next structures. What is the purpose of the Exit For statement How is Exit For used within a For-Next structure Describe the four variations of a Do-Loop structure. What is the purpose of each What is the principal difference between Do While and Do Until (or Loop While and Loop Until) What is the principal difference between Do While-Loop and Do-Loop While (or Do Until-Loop and DoLoop Until)
3.24 3.25 3.26 3.27 3.28
3.29 3.30
How can a Do-Loop structure be written so that at least one pass through the loop will always be executed Write a skeletal outline of a Do-Loop structure, illustrating the manner in which the logical expression is assigned its initial value and its subsequent values within the loop. Compare with a For-Next structure. What is the purpose of the Exit Do statement How is Exit Do used within a Do-Loop structure Compare with a For-Next structure. What is the purpose of the While-Wend structure Compare with the Do-Loop structure.
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