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

2. Objectives
Show the posttest repetition structure in pseudocode and in a flowchart
Code a posttest loop using the C++ do while statement
Nest repetition structures
Introduction to Programming with C++, Fourth Edition

3. Posttest Loops
Condition is evaluated with each repetition, or iteration, of the loop
Evaluation occurs after the instructions within the loop are processed
Introduction to Programming with C++, Fourth Edition

4. Posttest Loops (continued)
Introduction to Programming with C++, Fourth Edition

5. Coding the Posttest Loop
In the do while statement, the programmer must supply the loop condition to be evaluated
Loop condition:
Must be a Boolean expression (true or false)
Can contain variables, constants, functions, methods, arithmetic operators, comparison operators, and logical operators
Introduction to Programming with C++, Fourth Edition

6. Coding the Posttest Loop (continued)
Programmer must also supply statements to be processed when the loop condition evaluates to true
If more than one statement needs to be processed, they must be entered as a statement block
Introduction to Programming with C++, Fourth Edition

7. Syntax of the C++ do while Statement
Introduction to Programming with C++, Fourth Edition

8. Nested Repetition Structures
Inner loop - placed entirely within another loop, called the outer loop
Introduction to Programming with C++, Fourth Edition

9. Nested Loops Used by a Clock
Introduction to Programming with C++, Fourth Edition

10. Summary
Posttest repetition structure evaluates a condition after the loop body
Use the do while statement to code a posttest loop
You can also use nested repetition structures
Make sure the outer loop completely contains the inner loop
Introduction to Programming with C++, Fourth Edition