c# generating barcode For details on the use of gotos, 3 see in Section 17.3, goto. 4 in C#

Printing GS1 - 13 in C# For details on the use of gotos, 3 see in Section 17.3, goto. 4

For details on the use of gotos, 3 see in Section 17.3, goto. 4
UPC - 13 Maker In C#.NET
Using Barcode printer for .NET framework Control to generate, create EAN13 image in .NET framework applications.
www.OnBarcode.com
EAN13 Reader In C#.NET
Using Barcode recognizer for .NET framework Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
2 CROSS-REFERENCE
Create Barcode In Visual C#.NET
Using Barcode printer for .NET framework Control to generate, create barcode image in .NET framework applications.
www.OnBarcode.com
Barcode Recognizer In Visual C#.NET
Using Barcode recognizer for .NET framework Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
Avoid gotos The original reason to avoid gotos was that they made it difficult to prove that a program was correct. That s a nice argument for all the people who want to prove their programs correct, which is practically no one. The more pressing problem for most programmers is that gotos make code hard to format. Do you indent all the code between the goto and the label it goes to What if you have several gotos to the same label Do you indent each new one under the previous one Here s some advice for formatting gotos:
EAN-13 Generation In VS .NET
Using Barcode creator for ASP.NET Control to generate, create European Article Number 13 image in ASP.NET applications.
www.OnBarcode.com
GTIN - 13 Creator In .NET Framework
Using Barcode drawer for .NET Control to generate, create EAN13 image in .NET applications.
www.OnBarcode.com
Avoid gotos. This sidesteps the formatting problem altogether. Use a name in all caps for the label the code goes to. This makes the label obvious. Put the statement containing the goto on a line by itself. This makes the goto obvious. Put the label the goto goes to on a line by itself. Surround it with blank lines. This makes the label obvious. Outdent the line containing the label to the left margin to make the label as obvious as possible.
Generate EAN 13 In Visual Basic .NET
Using Barcode maker for .NET Control to generate, create EAN / UCC - 13 image in .NET framework applications.
www.OnBarcode.com
Bar Code Encoder In Visual C#
Using Barcode maker for .NET Control to generate, create barcode image in VS .NET applications.
www.OnBarcode.com
Goto labels should be left-aligned in all caps and should include the programmer s name, home phone number, and credit card number. Abdul Nizar
Generate Linear Barcode In Visual C#
Using Barcode encoder for .NET Control to generate, create 1D Barcode image in VS .NET applications.
www.OnBarcode.com
UPC Symbol Printer In C#
Using Barcode generator for .NET framework Control to generate, create Universal Product Code version A image in .NET applications.
www.OnBarcode.com
Listing 31-34 shows these goto layout conventions at work.
Painting EAN / UCC - 13 In C#.NET
Using Barcode printer for .NET Control to generate, create GS1-128 image in Visual Studio .NET applications.
www.OnBarcode.com
ISSN - 10 Creation In C#
Using Barcode printer for Visual Studio .NET Control to generate, create ISSN - 13 image in .NET framework applications.
www.OnBarcode.com
Listing 31-34. C++ example of making the best of a bad situation (using goto).
Draw Barcode In Java
Using Barcode drawer for Java Control to generate, create barcode image in Java applications.
www.OnBarcode.com
Creating Bar Code In VB.NET
Using Barcode maker for VS .NET Control to generate, create barcode image in .NET applications.
www.OnBarcode.com
void PurgeFiles( ErrorCode & errorCode ) { FileList fileList; int numFilesToPurge = 0; MakePurgeFileList( fileList, numFilesToPurge ); errorCode = FileError_Success; int fileIndex = 0; while ( fileIndex < numFilesToPurge ) { DataFile fileToPurge; if ( !FindFile( fileList[ fileIndex ], fileToPurge ) ) { errorCode = FileError_NotFound;
ECC200 Reader In Visual Basic .NET
Using Barcode recognizer for VS .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
GS1 DataBar Stacked Maker In Visual Studio .NET
Using Barcode maker for Visual Studio .NET Control to generate, create GS1 DataBar Truncated image in .NET applications.
www.OnBarcode.com
For other methods of addressing 0 this problem, see Error 1 Processing and gotos in 2 Section 17.3.
EAN / UCC - 14 Creator In .NET
Using Barcode maker for ASP.NET Control to generate, create GS1-128 image in ASP.NET applications.
www.OnBarcode.com
Create Code 128 Code Set B In Java
Using Barcode generator for Eclipse BIRT Control to generate, create Code 128A image in BIRT applications.
www.OnBarcode.com
9 CROSS-REFERENCE
ECC200 Generation In Java
Using Barcode drawer for Java Control to generate, create DataMatrix image in Java applications.
www.OnBarcode.com
USS-128 Generator In Java
Using Barcode generator for BIRT reports Control to generate, create EAN128 image in Eclipse BIRT applications.
www.OnBarcode.com
de Complete
31. Layout and Style
Page 24
Here s a goto.
goto END_PROC;
if ( !OpenFile( fileToPurge ) ) { errorCode = FileError_NotOpen; goto END_PROC; } if ( !OverwriteFile( fileToPurge ) ) { errorCode = FileError_CantOverwrite; goto END_PROC; } if ( !Erase( fileToPurge ) ) { errorCode = FileError_CantErase; goto END_PROC; } fileIndex++; } END_PROC: DeletePurgeFileList( fileList, numFilesToPurge ); }
6 Here s a goto.
1 Here s a goto.
6 Here s a goto.
1 Here s the goto label. The layout is to make the label hard to miss.
3 intent of the capitalization and
For details on using case state7 ments, see Section 15.2, 8 case Statements.
6 CROSS-REFERENCE
The C++ example in Listing 31-34 is relatively long so that you can see a case in which an expert programmer might conscientiously decide that a goto is the best design choice. In such a case, the formatting shown is about the best you can do.
No endline exception for case statements One of the hazards of endline layout comes up in the formatting of case statements. A popular style of formatting cases is to indent them to the right of the description of each case, as shown in Listing 31-35. The big problem with this style is that it s a maintenance headache.
Listing 31-35. C++ example of hard-to-maintain endline layout of a case statement.
switch ( ballColor ) { case BallColor_Blue: case BallColor_Orange: Rollout(); break; SpinOnFinger(); break; case BallColor_FluorescentGreen: Spike(); break; case BallColor_White: case BallColor_WhiteAndBlue: KnockCoverOff(); break; if ( mainColor == BallColor_White ) {
de Complete
31. Layout and Style
Page 25
KnockCoverOff(); else if ( mainColor == BallColor_Blue ) { RollOut(); } break; default: } FatalError( "Unrecognized kind of ball." ); break;
If you add a case with a longer name than any of the existing names, you have to shift out all the cases and the code that goes with them. The large initial indentation makes it awkward to accommodate any more logic, as shown in the WhiteAndBlue case. The solution is to switch to your standard indentation increment. If you indent statements in a loop three spaces, indent cases in a case statement the same number of spaces, as in Listing 31-36:
Listing 31-36. C++ example of good standard indentation of a case statement.
switch ( ballColor ) { case BallColor_Blue: Rollout(); break; case BallColor_Orange: SpinOnFinger(); break; case BallColor_FluorescentGreen: Spike(); break; case BallColor_White: KnockCoverOff(); break; case BallColor_WhiteAndBlue: if ( mainColor = BallColor_White ) { KnockCoverOff(); } else if ( mainColor = BallColor_Blue ) { RollOut(); } break; default: FatalError( "Unrecognized kind of ball." ); break; }
This is an instance in which many people might prefer the looks of the first example. For the ability to accommodate longer lines, consistency, and maintainability, however, the second approach wins hands down.
Copyright © OnBarcode.com . All rights reserved.