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AP®︎/College Computer Science Principles

Lesson 4: Strings

String operations

AP.CSP: AAP‑2 (EU), AAP‑2.D (LO), AAP‑2.D.1 (EK), AAP‑2.D.2 (EK)

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))

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