Controls - CS 1054 Iteration Controls 1 Iteration causing a set of statements(the body to be executed repeatedly Before considering specifics we

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
CS 1054 Controls Intro to Object-Oriented Dev I Computer Science Dept Va Tech Jan. 2006 ©2006 Barnette, ND 1 Iteration s Iteration causing a set of statements (the body) to be executed repeatedly. Before considering specifics we define some general terms that apply to any iteration construct: When designing a loop, it is important to clearly identify each of these. Understanding the termination condition, and what guarantees it will eventually occur, are particularly vital. pass (or iteration) - one complete execution of the body loop entry - the point where flow of control passes to the body loop test - the point at which the decision is made to (re)enter the body, or not loop exit - the point at which the iteration ends and control passes to the next statement after the loop termination condition - the condition that causes the iteration to stop Controls Intro to Object-Oriented Dev I Computer Science Dept Va Tech Jan. 2006 ©2006 Barnette, ND 2 while Loop s while statement The most versatile loop construct. Syntactically: The Boolean expression is examined before each pass through the body of the loop. If the Boolean expression is true, the loop body is executed; if it is false, execution proceeds to the first statement after the loop body. . while <bool expr> <loop body> The <loop body> can be either a single statement or a compound statement. Semantically: while <bool expr> <loop body> true false
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
CS 1054 Controls Intro to Object-Oriented Dev I Computer Science Dept Va Tech Jan. 2006 ©2006 Barnette, ND 3 while Code s Reserved word while starts the instruction s Parentheses must enclose the <test> s Braces should enclose the <instruction-list>; in the usual way s <test> : The same conditions used in the if instructions s Implementation steps Step 0 : Perform any necessary initialization or setup instructions for the loop Step 1 : Identify the one test that must be true when the task is finished Step 2 : Use the opposite form of the test (negation) Step 3 : Within the while , make progress toward completion of the while Step 4 : Perform any necessary termination or cleanup instructions after the loop to complete solving the problem while ( <test> ) { <instruction-list> } Controls Intro to Object-Oriented Dev I Computer Science Dept Va Tech Jan. 2006
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 08/30/2011 for the course ART 3514 taught by Professor Dhbannan during the Summer '03 term at Virginia Tech.

Page1 / 8

Controls - CS 1054 Iteration Controls 1 Iteration causing a set of statements(the body to be executed repeatedly Before considering specifics we

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online