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Summary of Techniques for Reducing Deep Nesting
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Here is a summary of the techniques you can use to reduce deep nesting, along with references to the section in this book that discuss the technique: Retest part of the condition (this section) Convert to if-then-elses (this section) Convert to a case statement (this section) Factor deeply nested code into its own routine (this section) Use objects and polymorphic dispatch (this section) Rewrite the code to use a status variable (in Section 17.3.) Use guard clauses to exit a routine and make the nominal path through the code clearer (in Section 17.1.) Use exceptions (Section 8.4) Redesign deeply nested code entirely (this section)
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19.5 A Programming Foundation: Structured Programming
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The term structured programming originated in a landmark paper, Structured Programming, presented by Edsger Dijkstra at the 1969 NATO conference on software engineering (Dijkstra 1969). By the time structured programming came and went, the term structured had been applied to every software-development activity, including structured analysis, structured design, and structured goofing off. The various structured methodologies weren t joined by any common thread except that they were all created at a time when the word structured gave them extra cachet. The core of structured programming is the simple idea that a program should use only one-in, one-out control constructs (also called single-entry, single-exit control constructs). A one-in, one-out control construct is a block of code that has only one place it can start and only one place it can end. It has no other entries or exits. Structured programming isn t the same as structured, top-down design. It applies only at the detailed coding level. A structured program progresses in an orderly, disciplined way, rather than jumping around unpredictably. You can read it from top to bottom, and it executes in much the same way. Less disciplined approaches result in source
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code that provides a less meaningful, less readable picture of how a program executes in the machine. Less readability means less understanding and, ultimately, lower program quality. The central concepts of structured programming are still useful today and apply to considerations in using break, continue, throw, catch, return, and other topics.
The Three Components of Structured Programming
The next few sections describe the three constructs that constitute the core of structured programming.
Sequence
A sequence is a set of statements executed in order. Typical sequential statements include assignments and calls to routines. Here are two examples:
Java Examples of Sequential Code
// a sequence of assignment statements a = "1"; b = "2"; c = "3"; // a sequence of calls to routines System.out.println( a ); System.out.println( b ); System.out.println( c );
For details on using sequences, 8 see 14, Organizing Straight-Line Code.
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Selection
A selection is a control structure that causes statements to be executed selectively. The if-then-else statement is a common example. Either the if-then clause or the else clause is executed, but not both. One of the clauses is selected for execution. A case statement is another example of selection control. The switch statement in C++ and Java and the select statement in Visual Basic are all examples of case. In each instance, one of several cases is selected for execution. Conceptually, if statements and case statements are similar. If your language doesn t support case statements, you can emulate them with if statements. Here are two examples of selection:
Java Examples of Selection
// selection in an if statement
For details on using selections, 1 see 15, Using 2 Conditionals.
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if ( totalAmount > 0.0 ) { // do something ... } else { // do something else ... } // selection in a case statement switch ( commandShortcutLetter ) { case 'a': PrintAnnualReport(); break; case 'q': PrintQuarterlyReport(); break; case 's': PrintSummaryReport(); break; default: DisplayInternalError( "Internal Error 905: Call customer support." ); }
Iteration
An iteration is a control structure that causes a group of statements to be executed multiple times. An iteration is commonly referred to as a loop. Kinds of iterations include For-Next in Visual Basic, and while and for in C++ and Java. The code fragment below shows examples of iteration in Visual Basic:
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