Class 2 Objectives

KNOW:

• the rules for evaluating an expression
• define can be used to create functions
• define can be used to name constants
• a function should be commented with a signature and a purpose
• programs are built by combining smaller computations into larger computations

BE ABLE TO:

• define a function that performs an arithmetic calculation on its inputs
• demonstrate step-by-step how function calls are evaluated by Racket
• write a signature and a purpose for a function

Vocabulary: function definition, parameter, function heading, function body, signature, purpose, data type, operator, function call

Sample Exam Question:

Define a function called tip that will add a 15% tip to a given number. Write a signature and a purpose for your function. Then define a function called share-with-tip that computes the share of the cost of a pizza, including the cost of the tip (refer to your answer to yesterday's sample exam question). Write a signature and purpose for share-with-tip.