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For index = value1 To value2 . . . . . . . .
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. . . . . . . . Next index
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The For-To statement specifies the number of passes through the loop. Within this statement, index is a variable whose value begins with value1, increases by 1 each time the loop is executed, until it reaches value2. Note that the value of index will be value2 during the last pass through the loop.
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The Next statement identifies the end of the loop. It consists simply of the keyword Next, followed by the index. The index appearing in the For-To and the Next statements must be the same. (Visual Basic allows the index to be omitted from the Next statement in single For-Next loops, though this is considered poor programming practice.) The executable statements refer to one or more consecutive statements that are executed during each pass through the loop. These statements are usually indented, so that the structure can easily be identified. The indentation is not required, though it is considered good programming practice.
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A typical For-To loop structure is shown below.
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sum = 0 For i = 1 To 10 sum = sum + i Next i
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This structure will result in 10 passes through the loop. During the first pass, i will be assigned a value of 1; i will then increase by 1 during each successive pass through the loop, until it has reached its final value of 10 in the last pass. Within each pass, the current value of i is added to sum. Hence, the net effect of this program segment is to determine the sum of the first 10 integers (i.e., 1 + 2 + . . . + 10). Note the indentation of the assignment statement within the loop structure.
A more general form of the For-Next structure can be written as
For index = value1 To value2 Step value3 . . . . . . . .
executable statements
. . . . . . . . Next index
Within the For-To statement, value3 determines the amount by which value1 changes from one pass to the next. This quantity need not be restricted to an integer, and it can be either positive or negative. If value3 is negative, then value1 must be greater than value2 (because the value assigned to index will decrease during each successive pass through the loop). Note that value3 is understood to equal 1 if it is not shown explicitly (i.e., if the Step clause is omitted).
EXAMPLE 3.15
The loop structure
sum = 0 For count = 2.5 To -1 STEP -0.5 sum = sum + count Next count
will cause count to take on the values 2.5, 2.0, 1.5, . . ., 0.0, -0.5, -1.0. Hence, the final value of sum will be 6.0 (because 2.5 + 2.0 + 1.5 + 1.0 + 0.5 + 0.0 0.5 1.0 = 6.0). Note that this structure will generate a total of eight passes through the loop.
The For-Next structure is one of the most widely used features in Visual Basic. It is most often used when the number of passes through the loop is known in advance.
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The following rules apply to For-Next loops. 1. 2. 3. The index variable can appear within a statement inside the loop, but its value cannot be altered. If value1 and value2 are equal and value3 is nonzero, the loop will be executed once. The loop will not be executed at all under any of the following conditions: (a) value1 and value2 are equal, and value3 is zero. (b) value1 is greater than value2, and value3 is positive. (c) value1 is less than value2, and value3 is negative. 4. Control can be transferred out of a loop, but not in (see below).
Visual Basic includes an Exit For statement. This statement permits a transfer out of a For-Next loop if some particular condition is satisfied. For example, we may wish to jump out of a loop if an error or a stopping condition is detected during the execution of the loop. The Exit For statement is generally embedded in an If-Then structure that is included within the loop. When the Exit For statement is encountered during program execution, control is immediately transferred out of the For-Next loop, to the first executable statement following Next.
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