Procedures with return values

You might need: Calculator

Aarush is writing a program to help him calculate how much exercise he does at the gym.

The procedure calcSwimYards returns the number of yards swam for a given number of laps in a pool of a given length.

PROCEDURE calcSwimYards(poolLength, numLaps)
{
   lapLength ← poolLength * 2
   RETURN lapLength * numLaps
}

Aarush then runs this line of code:

yardsSwam ← calcSwimYards(25, 10)

What value is stored in yardsSwam?

🤔

This code is written in pseudocode. You can't actually run pseudocode, but we use it for planning programs and for thinking about code independently of specific programming language.

AP CSP exam questions use pseudocode, so it's helpful to become familiar with it.

Here is a reference for the pseudocode used here:

PROCEDURE name (parameter1, parameter2, ...)
{
     <instructions>
     RETURN (expression)
}

A procedure called "name" that takes zero or more parameters. The procedure contains programming instructions and returns the value of expression.

a ← expression

Evaluates expression and assigns the result to the variable a.

**Arithmetic operators**
Instruction	Explanation
`a + b`	Evaluates to the result of `b` added to `a`
`a - b`	Evaluates to the result of `b` subtracted from `a`
`a * b`	Evaluates to the result of `a` multiplied by `b`
`a / b`	Evaluates to the result of `a` divided by `b`

AP®︎/College Computer Science Principles

Course: AP®︎/College Computer Science Principles > Unit 3

Problem