Lecture 2 Objectives

KNOW:

• define can be used to create functions
• define can be used to name constants
• a function should be commented with a contract and a purpose
• programs are built by combining smaller computations into larger computations

BE ABLE TO:

• create a function that performs an arithmetic calculation on its inputs
• use DrRacket's stepper to determine how operations are evaluated
• write a contract and a purpose for a function

Sample Exam Question:

Define a function called tip that will add a 15% tip to a given number. Write a contract 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 contract and purpose for share-with-tip.