Overview of Loop Structures and Control Variables
In this comprehensive guide, you will learn about different types of loops, logical aspects of loop control, and best practices for loop construction. Explore the concepts of initialization, continuation conditions, loop bodies, and updates for control variables. Dive into the characteristics of while loops, for loops, do-while loops, and loop conversions. Embrace valuable insights for creating efficient loop structures to enhance your programming skills.
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Presentation Transcript
Iteration CSCE 121 J. Michael Moore & Philip Ritchey
Logical Parts of a Loop and Terminology Loop Body Don t forget to initialize Iteration One instance of executing the loop body. Continuation Condition (Boolean expression) AKA loop control, exit condition, termination condition, etc. Initialize Update
Creating a Loop 1. What do things have to look like before entering the loop? Initialization (control variable) Initialization (loop body) 2. How do you get out of the loop? Control variable Continuation condition 3. What do you do ensure you can exit the loop? Update 4. What does the loop do? Loop Body
While // initialize while (continuation condition) { // do stuff // update } false true
For // A. initialize // B. continuation condition // C. update false true for(A; B; C) { // do stuff } Bad style to update control variable inside loop.
Types of control Counting Control variable increments by set amount each iteration. Sentinel Control variable is set to a value obtained during the loop each iteration. Flag Control variable is a Boolean variable that represents a condition each iteration. Special case of sentinel
Do While // initialize do { // do stuff // update (can be initialization) } while (continuation condition); true false
Loops Loop type Minimum times through loop Maximum times through loop While 0 For 0 Do While 1 Loop type Initialization Update While Outside of loop Within loop body For Built into statement Built into statement Do While Outside of loop Within loop body
Loop conversion Most loops can be converted to any other type of loop. What can t? (Well you could but it would be bad practice) Good exercise that can help you build good loop structures. Remember the guidance for building a loop: Initialize control variable(s) Specify continuation condition Specify loop body Define update for control variable
