Preface Audience Worksheet Graphical Manual Set Conventions Customer Feedback Interface. Procedures Variables and Extending Maple Prerequisite Knowledge In This Chapter 11 Nested Procedures Scoping Rules Local Versus Global Variables The QuickSort Algorithm Example Creating a Uniform Random Number Generator 12 Procedures That Return Procedures Conveying Values Creating a Newton Iteration Example 1 Example 2 A Shift Operator 13 Local Variables and Invoking Procedures Example 1 Example 2 Procedure as a Returned Object Example 3 Example 4 Exercises 14 Interactive Input iii.