1 / 23

An Introduction to Programming with C++ Fifth Edition

Learn how to include the posttest repetition structure in pseudocode, flowchart, and code using C++. Explore nested repetition structures.

wthornton
Download Presentation

An Introduction to Programming with C++ Fifth Edition

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. An Introduction to Programming with C++Fifth Edition Chapter 8 More on the Repetition Structure

  2. Objectives • Include the posttest repetition structure in pseudocode • Include the posttest repetition structure in a flowchart • Code a posttest loop using the C++ do while statement • Nest repetition structures An Introduction to Programming with C++, Fifth Edition

  3. Concept Lesson • Posttest Loops • Coding the Posttest Loop • Nested Repetition Structures An Introduction to Programming with C++, Fifth Edition

  4. Posttest Loops • Loops can be pretest or posttest • Condition in a posttest loop is evaluated with each loop iteration • Evaluation occurs after instructions within loop are processed • Also called bottom-driven loops An Introduction to Programming with C++, Fifth Edition

  5. Posttest Loops (continued) An Introduction to Programming with C++, Fifth Edition

  6. Flowcharting a Posttest Loop • Flowcharts illustrate why loops are referred to as pretest and posttest loops • Repetition diamond appears at the top of a pretest loop, but at the bottom of a posttest loop An Introduction to Programming with C++, Fifth Edition

  7. Flowcharting a Posttest Loop (continued) An Introduction to Programming with C++, Fifth Edition

  8. Flowcharting a Posttest Loop (continued) An Introduction to Programming with C++, Fifth Edition

  9. Flowcharting a Posttest Loop (continued) An Introduction to Programming with C++, Fifth Edition

  10. Coding the Posttest Loop • Use the while statement or the for statement to code a pretest loop in C++ • Use the do while statement to code a posttest loop in C++ • The loop condition must be a Boolean expression • Can contain variables, constants, functions, and arithmetic/comparison/logical operators An Introduction to Programming with C++, Fifth Edition

  11. Coding the Posttest Loop (continued) An Introduction to Programming with C++, Fifth Edition

  12. Posttest Loop Example – O’Donnell Incorporated Program • Problem description • In January of each year, O’Donnell Incorporated pays a 10% bonus to each of its salespeople • Bonus based on amount of sales made by salesperson during previous year • Payroll clerk wants a program that calculates and displays each salesperson’s bonus amount An Introduction to Programming with C++, Fifth Edition

  13. Posttest Loop Example – O’Donnell Incorporated Program (continued) An Introduction to Programming with C++, Fifth Edition

  14. Posttest Loop Example – O’Donnell Incorporated Program (continued) An Introduction to Programming with C++, Fifth Edition

  15. Nested Repetition Structures • In a nested repetition structure, one loop (inner loop) is placed entirely within another loop (outer loop) An Introduction to Programming with C++, Fifth Edition

  16. Nested Repetition Structures (continued) An Introduction to Programming with C++, Fifth Edition

  17. Nested Loop Example – Max Beauty Supply Program • Max Beauty Supply divides its sales territory into two regions: Region 1 and Region 2 • Sales manager wants a program to enter the sales amounts for both regions, one region at a time • Program should calculate the total amount sold in the current region, and display that information An Introduction to Programming with C++, Fifth Edition

  18. Nested Loop Example – Max Beauty Supply Program (continued) An Introduction to Programming with C++, Fifth Edition

  19. Nested Loop Example – Max Beauty Supply Program (continued) An Introduction to Programming with C++, Fifth Edition

  20. Nested Loop Example – Max Beauty Supply Program (continued) An Introduction to Programming with C++, Fifth Edition

  21. Nested Loop Example – Max Beauty Supply Program (continued) An Introduction to Programming with C++, Fifth Edition

  22. Summary • A repetition structure can be a pretest or posttest loop • In a pretest loop, the loop condition is evaluated before the instructions in the loop body are processed • Instructions may never be processed • Use while or for statements • In a posttest loop, the loop condition is evaluated after the instructions in the loop body are processed • Instructions are always processed at least once • Use the do while statement • You can nest repetition structures An Introduction to Programming with C++, Fifth Edition

  23. Application Lesson: Using a Nested Repetition Structure in a C++ Program • Lab 8.1: Stop and Analyze • Lab 8.2 • Create a program that displays one or more multiplication tables for Mrs. Johnson students • Lab 8.3 • Modify program so it uses a posttest loop (instead of a pretest loop) to display the multiplication tables • Lab 8.4: Desk-Check Lab • Lab 8.5: Debugging Lab An Introduction to Programming with C++, Fifth Edition

More Related