vb.net barcode scan event for Var = ExprN1 To ExprN2 {Step ExprN3} statement statement ... next in Software

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for Var = ExprN1 To ExprN2 {Step ExprN3} statement statement ... next
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The interpreter will repeat the statements between the for/next a number of times equaling Abs(ExprN2-ExprN1)/ExprN3+1. The interpreter will put ExprN1 result into Var. The statements between the for/next structure will be executed. The interpreter will then decrement Var by ExprN3 if given or 1 if not. The interpreter will then check if the result is greater than ExprN2. If it is, program ow will continue with the statement after the next (i.e., exit the for/next loop). If not, ow will go back to the statement right after the for and repeat the whole process. You can optionally give a Step size. Var must be a variable but it does need not be previously de ned. EprN1, EprN2, and EprN3 must result in integers. ExprN3 must be greater than 0. If it is 0 then it will be made 1. If it is less than 0 then it will be made positive. If ExprN1 is greater than ExprN2 the interpreter will decrement ExprN1 until it is less than ExprN2. You can nest for-loops. An error will occur if you try to nest too deep.
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NOTE: You can modify the Var counter within a for/next loop, just as any other variable. But beware of your logic. Use Break/Continue along with if/else/endif or if/then to force an early abort or reloop of the loop (i.e., before reaching the end-count).
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For I = 0 to 10 step 2 Print I Next //will print 0 2 4 6 8 10 For I=10 to 0 step 2 Print I Next //will print 10 8 6 4 2 0
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C.6.4 Repeat-Until LOOP
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repeat Statement Statement ... until ExprN
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Will execute the statements between the repeat-until as long as ExprN evaluates to zero. The lines within the loop will be executed at least one time, since ExprN will not be evaluated until the loop has been executed the rst time. You can use Break within the loop, which will force the loop to terminate immediately, ignoring any lines after the Break. You can use Continue within the loop, which will force the loop to reloop immediately, ignoring any lines after the Continue. Example:
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I = 0 repeat Print I I = I+1 If I # 2 <> 0 I = I+1 If I > 10 then break continue Endif until I > 20 //will print 0 2 4 6 8 10
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APPENDICES
C.6.5 While-Wend LOOP
while ExprN Statement Statement ... wend
Will execute the statements between the while-wend as long as ExprN evaluates to other than zero. The lines within the loop may never execute if ExprN evaluates to zero upon entry into the loop. You can use Break within the loop, which will force the loop to terminate immediately ignoring any lines after the Break. You can use Continue within the loop, which will force the loop to reloop immediately ignoring any lines after the Continue. Example:
I = 0 while I < 20 Print I I = I+1 If I # 2 <> 0 I = I+1 If I > 10 then break continue Endif wend //will print 0 2 4 6 8 10
C.6.6 Break STATEMENT Used inside a for/next, repeat/until, and while/wend loops to break the loop immediately. The lines beyond the Break statement will not execute and the current level of the for/repeat/while loop will be abandoned to the line following next/repeat/wend line associated with the current level. This is useful if a loop needs to be abandoned before reaching the end of the loop. C.6.7 Continue STATEMENT Used inside a for/next, repeat/until, and while/wend loop to reloop the loop immediately. The lines beyond the Continue statement will not execute. The program ow will go to the end of the loop (next/until/wend). Execution will continue on that statement. The loop will be executed as per normal. This is useful if a loop needs to be repeated before reaching the end of the loop. C.6.8 Case CONSTRUCT The case construct is not implemented in the language. However, you can emulate a case construct using the structured-if.
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