Program Logic

Repetition Structures

Learning Objectives

In addition to all previous competencies, upon completion of this unit, you should be able to:

• Understand and explain the different loop categories
• Understand and create commonly used loops
• Understand and create nested loops
• Validate end-user input
• Understand how to avoid infinite loops
• Understand and create loops with decision structures

Unit Learning Activities

In this unit you will learn the basics of repetition structures. After all, computers are very good at repeating a sequence of commands over and over without tiring. Repetition structures should be firmly implanted into your bag of tricks. Please note, this unit includes a detailed example which I highly recommend you type into a NetBeans project, make sure it works, and step through the code.

Each link below takes you to a specific chapter within this unit. Please take the time to review all the chapters and when available, complete the interactive activities.

"Success is the sum of small efforts - repeated day in and day out." - Robert Collier

1. Repetition Structures Overview
   • Pre-test Loops
   • Post-test Loops
   • Counter-Controlled Loops
   • Condition-Controlled Loops
   • Infinite Loops
   • What You Learned
2. Counter-Controlled Loops
   • Counter-Controlled while Loop
   • Counter-Controlled for Loop
   • What You Learned
3. Condition-Controlled Loops
   • Stop on a Sentinel
   • Using Two Sentinels
   • Things to Remember
4. Combining Repetition Structures and Decision Structures
   • Testing for true
   • Code Example
   • Repetition Structure with Nested Decision
   • Things to Remember
   • Input Validation
   • Detailed Example
5. Nested Loops
   • Code Example
   • The Concept
   • Interactive Live Demo
6. This unit includes the following detailed example
   • Check for Even Number by combining repetition and decision structures