c# ean 13 generator Here s the TransactionType_Transfer transaction type. in Visual C#.NET

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6 Here s the TransactionType_Transfer transaction type.
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Although it s complicated, this isn t the worst code you ll ever see. It s nested to only four levels, it s commented, it s logically indented, and the functional decomposition is adequate, especially for the TransactionType_Transfer transaction type. In spite of its adequacy, however, you can improve it by breaking the contents of the inner if tests into their own routines.
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This kind of functional decomposition is especially easy if you initially built the routine using the steps described in 9, The Pseudocode Programming Process. Guidelines for functional decomposition are given in Divide and Conquer in Section 5.4.
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C++ Example of Good, Nested Code After Decomposition into Routines
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while ( !TransactionsComplete() ) { // read transaction record transaction = ReadTransaction(); // process transaction depending on type of transaction if ( transaction.Type == TransactionType_Deposit ) { ProcessDeposit( transaction.AccountType, transaction.AccountSubType, transaction.AccountNum, transaction.Amount ); } else if ( transaction.Type == TransactionType_Withdrawal ) { ProcessWithdrawal( transaction.AccountType, transaction.AccountNum, transaction.Amount ); } else if ( transaction.Type == TransactionType_Transfer ) { MakeFundsTransfer( transaction.SourceAccountType, transaction.TargetAccountType, transaction.AccountNum, transaction.Amount ); } else { // process unknown transaction type LogTransactionError("Unknown Transaction Type", transaction ); } }
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The code in the new routines has simply been lifted out of the original routine and formed into new routines. (The new routines aren t shown here.) The new code has several advantages. First, two-level nesting makes the structure simpler and easier to understand. Second, you can read, modify, and debug the shorter while loop on one screen it doesn t need to be broken across screen or printedpage boundaries. Third, putting the functionality of ProcessDeposit() and ProcessWithdrawal() into routines accrues all the other general advantages of modularization. Fourth, it s now easy to see that the code could be broken into a switch-case statement, which would make it even easier to read, as shown below:
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C++ Example of Good, Nested Code After Decomposition and Use of a switch-case Statement
while ( !TransactionsComplete() ) { // read transaction record transaction = ReadTransaction(); // process transaction depending on type of transaction switch ( transaction.Type ) { case ( TransactionType_Deposit ): ProcessDeposit( transaction.AccountType, transaction.AccountSubType, transaction.AccountNum, transaction.Amount ); break; case ( TransactionType_Withdrawal ): ProcessWithdrawal( transaction.AccountType, transaction.AccountNum, transaction.Amount ); break; case ( TransactionType_Transfer ): MakeFundsTransfer( transaction.SourceAccountType, transaction.TargetAccountType, transaction.AccountNum, transaction.Amount ); break; default: // process unknown transaction type LogTransactionError("Unknown Transaction Type", transaction ); break; } }
Use a more object-oriented approach A straightforward way to simplify this particular code in an object-oriented environment is to create an abstract Transaction base class and subclasses for Deposit, Withdrawal, and Transfer.
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C++ Example of Good Code That Uses Polymorphism
TransactionData transactionData; Transaction *transaction; while ( !TransactionsComplete() ) { // read transaction record transactionData = ReadTransaction(); // create transaction object, depending on type of transaction switch ( transactionData.Type ) { case ( TransactionType_Deposit ): transaction = new Deposit( transactionData ); break; case ( TransactionType_Withdrawal ): transaction = new Withdrawal( transactionData ); break; case ( TransactionType_Transfer ): transaction = new Transfer( transactionData ); break; default: // process unknown transaction type LogTransactionError("Unknown Transaction Type", transaction ); break; } transaction->Complete(); delete transaction; }
5 CROSS-REFERENCE
In a system of any size, the switch statement would be converted to use a factory method that could be reused anywhere an object of Transaction type needed to be created. If this code were in such a system, this part of it would become even simpler:
C++ Example of Good Code That Uses Polymorphism and an Object Factory
TransactionData transactionData; Transaction *transaction; while ( !TransactionsComplete() ) { // read transaction record and complete transaction transactionData = ReadTransaction(); transaction = TransactionFactory.Create( transactionData ); transaction->Complete();
For more beneficial code 7 improvements like this, see 8 24, "Refactoring."
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delete transaction;
For the record, the code in the TransactionFactory.Create() routine is a simple adaptation of the code from the prior example s switch statement:
C++ Example of Good Code For an Object Factory
Transaction *TransactionFactory::Create( TransactionData transactionData ) { // create transaction object, depending on type of transaction switch ( transactionData.Type ) { case ( TransactionType_Deposit ): return new Deposit( transactionData ); break; case ( TransactionType_Withdrawal ): return new Withdrawal( transactionData ); break; case ( TransactionType_Transfer ): return new Transfer( transactionData ); break; default: // process unknown transaction type LogTransactionError( "Unknown Transaction Type", transaction ); return NULL; } }
Redesign deeply nested code Some experts argue that case statements virtually always indicate poorly factored code in object-oriented programming, and that case statements are rarely if ever needed (Meyer 1997). This is one such example.
More generally, complicated code is a sign that you don t understand your program well enough to make it simple. Deep nesting is a warning sign that indicates a need to break out a routine or redesign the part of the code that s complicated. It doesn t mean you have to modify the routine, but you should have a good reason if you don t.
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