String operations

Barry is making a program to process user birthdays.

The program uses the following procedure for string slicing:

Name	Description
`SUBSTRING (string, startPos, numChars)`	Returns a substring of `string` starting at `startPos` of length `numChars`. The first character in the string is at position 1.

His program starts with this line of code:

userBday ← "03/31/1984"

Which of these lines of code displays the month ("03")?

(Choice A)
DISPLAY (SUBSTRING (userBday, 0, 1))
(Choice B)
DISPLAY (SUBSTRING (userBday, 0, 3))
(Choice C)
DISPLAY (SUBSTRING (userBday, 0, 2))
(Choice D)
DISPLAY (SUBSTRING (userBday, 1, 2))
(Choice E)
DISPLAY (SUBSTRING (userBday, 1, 3))
(Choice F)
DISPLAY (SUBSTRING (userBday, 1, 1))

🤔

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:

Instruction	Explanation
`a ← expression`	Evaluates `expression` and assigns the result to the variable `a`.
`name (parameter1, parameter2, ...)`	Describes a procedure that takes zero or more parameters. The procedure contains programming instruction.
`DISPLAY (expression)`	Displays the value of expression, followed by a space.

AP®︎/College Computer Science Principles

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

Problem