barcodeaddin.com

BREAKING OUT in .NET Generator DataMatrix in .NET BREAKING OUT




How to generate, print barcode using .NET, Java sdk library control with example project source code free download:
11.2. BREAKING OUT generate, create ecc200 none in .net projects Microsoft .NET Micro Framework Exhibit 11.7. Some Pascal .

net framework Data Matrix 2d barcode code that will stop with a run-time error. Assume k is an integer, and a is an array with subscripts from 1 to max. This code sums the items in a up to but not including the rst negative or zero element.

k := 1; sum := 0; While ( k<=max ) and ( a[k]>0 ) Do Begin sum := sum + a[k]; k := k + 1 End;. is declared, and an IF sta tement within the loop sets it to TRUE if the ABORT condition happens. Then the test in the loop control element is modi ed to test this ag also. This will cause an exit from the loop at the beginning of the iteration after the ABORT condition was discovered.

After loop exit, some other mechanism must be found to determine what condition caused the exit and take appropriate action. This awkward program idiom is illustrated in 8, Exhibit 8.13, where a ag named done is introduced to permit an abortive loop exit.

In more complex situations a Pascal programmer might use several Boolean ags, set in several places, and combined into a complex expression for the exit condition. This is logical spaghetti just as surely as if we used many GOTOs to create this control pattern. Our goal is to eliminate the need for spaghetti in our programs.

2 To do this we need a structured way to exit from the middle of a loop. Such an exit mechanism is provided by the BREAK statement (or its equivalent) in many languages. The BREAK is simply a structured GOTO to the end of the control unit.

It may be placed anywhere within a loop, and it transfers control immediately to the statement following the loop. Its control diagram [Exhibit 11.8] is an immediate exit into the frame of the statement.

(A frame is added if the control structure does not already have one.). See Section 11.1. Exhibit 11.8. Structured conditional loops with BREAK. BREAK exits to the right. Scope A Break Scope B End Loop A loop with a conditional BREAK. Loop Scope A If <condition> Then Else <Scope B> Break CHAPTER 11. GLOBAL CONTROL Exhibit 11.9. The input lo .

NET data matrix barcodes op implemented using break in C. char *name; /* This is a string variable. */ for(;;) /* An explicit endless loop.

*/ { printf ("Please type your name. "); scanf ("%s", name); if (name[1] == \0 ) break; /* Exit if no name was entered. */ printf ("Hello %s, Nice to see you.

\n", name); } printf ("Goodbye.");. C3 and the newer procedura l languages, Ada and Turing, all include some form of the BREAK statement for aborting a loop in a structured manner. In Ada and Turing it is called EXIT. This is shown on a control diagram as a frame along the right side of the box which is connected to the bottom frame, from which control leaves the entire diagram.

Control enters this frame along a horizontal arrow wherever a break occurs in the program. Exhibit 11.9 gives one nal version of our print routine, written in C using break, which causes immediate exit from a loop.

By putting a break instruction inside an if, and embedding the whole thing in an in nite loop, we can achieve the same thing as in the original FORTRAN example, simply and e ciently.. Generalizing the BREAK In addition to statement l abels, for use with the GOTO instruction, Ada also has loop labels, which are used to create double-exit loops and to allow immediate, one-step exit from a nest of loops. The simple BREAK statement takes control immediately out of the enclosing control structure, and into the control scope that surrounds it. The Ada EXIT is a generalization of this idea; it can cause an immediate exit from an entire nest of loops (or any part of a nest) by naming the loop label of the outermost loop.

It can be used for any kind of loop (FOR, WHILE, or in nite) 4 [Exhibit 11.10]. We will call this control structure the FAR_EXIT.

The canonical example of an application for the FAR_EXIT is a search loop over a two-dimensional data structure such as a matrix or a list of lists. A double loop is used to process the structure, and when the key item is found, control must leave both loops. Implementing this exit actually requires more than a simple GOTO.

When an Ada FOR loop is entered, stack space is allocated for the loop variable. This obviously must be deallocated upon exit. C also has a continue stat VS .NET Data Matrix ement, which can be used inside any loop. It transfers control immediately to the top of the loop and begins the next iteration.

4 Ada is the only major language that lets you name a loop scope so that you can exit from it..
Copyright © barcodeaddin.com . All rights reserved.