Practice identifying, writing, and tracing functions that use parameters and return values.
Read each problem carefully. Show your work in the space provided.
Writing reusable code with inputs and return values
CS - Grade 9-12
- 1
In your own words, explain what a function is in programming and why programmers use functions.
- 2
What is a parameter? Explain how a parameter is different from an argument.
- 3
Consider this Python function: def greet(name): return "Hello, " + name. What is the parameter, and what is the return value when the function is called as greet("Maya")?
- 4
Write a Python function named square that takes one parameter named number and returns number multiplied by itself.
- 5
Trace the following code and state the final value stored in result: def add_tax(price): return price * 1.08 result = add_tax(50)
- 6
A function is defined as def calculate_total(cost, quantity): return cost * quantity. What are the parameters, and what value is returned by calculate_total(7, 4)?
- 7
Explain the difference between printing a value inside a function and returning a value from a function.
- 8
Find and fix the error in this function call: def average(a, b): return (a + b) / 2 score = average(80)
- 9
Write a Python function named is_passing that takes one parameter named score and returns True if score is greater than or equal to 60, otherwise returns False.
- 10
Consider this code: def double(x): return x * 2 def add_three(y): return y + 3 value = add_three(double(5)). What is the final value of value?
- 11
A programmer writes this function: def discount(price, percent): return price - percent. Explain why this function may not correctly calculate a percent discount, and write a better return statement.
- 12
Design a function named format_username that takes two parameters, first_name and last_name, and returns a username made from the first three letters of the first name plus the first three letters of the last name, all lowercase. Describe what format_username("Jordan", "Smith") should return.