A library is a collection of pre-written procedures that can be imported and used in a program.

An API ( Application Programming Interface ) is a set of rules and specifications that defines how procedures in a library can be used.

Name three things an API tells a programmer.

An API tells the programmer what procedures are available , what parameters they accept , and what values they return .

Why does using a library simplify development?

The programmer only needs to understand the API , not the internal implementation.

Why do programmers read API documentation ?

Programmers read API documentation to understand what a procedure does without needing to read its source code .

Name three sources that code used in a program can come from.

Code can come from existing libraries , other programmers , or online sources .

Well-written API documentation includes ________ showing how to call each procedure correctly.

Well-written API documentation includes examples showing how to call each procedure correctly.

True or False? RANDOM(3, 7) can return the value 7.

True. RANDOM(a, b) returns an integer from a to b inclusive , so 7 is possible.

True or False? Calling RANDOM with the same arguments always produces the same result.

False. Each time RANDOM is called it may produce a different result , even with the same arguments.

What are the possible values displayed by this code segment? num ← RANDOM(2, 4) DISPLAY(num * 10)

The possible values are 20 , 30 , and 40 , because num can be 2, 3, or 4.

Name two common uses of random values in programs.

Common uses include simulating events , generating test data , and creating games .

AP®Computer ScienceCollege BoardComputer Science PrinciplesFlashcardsUnit 3: Algorithms and ProgrammingLibraries

Libraries (College Board AP® Computer Science Principles): Flashcards

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Cards in this collection (11)

Define library.
A library is a collection of pre-written procedures that can be imported and used in a program.
Define API.
An API (Application Programming Interface) is a set of rules and specifications that defines how procedures in a library can be used.
Name three things an API tells a programmer.
An API tells the programmer what procedures are available, what parameters they accept, and what values they return.
Why does using a library simplify development?
The programmer only needs to understand the API, not the internal implementation.
Why do programmers read API documentation?
Programmers read API documentation to understand what a procedure does without needing to read its source code.
Name three sources that code used in a program can come from.
Code can come from existing libraries, other programmers, or online sources.
Well-written API documentation includes ________ showing how to call each procedure correctly.
Well-written API documentation includes examples showing how to call each procedure correctly.
True or False?
RANDOM(3, 7) can return the value 7.
True.
RANDOM(a, b) returns an integer from a to b inclusive, so 7 is possible.
True or False?
Calling RANDOM with the same arguments always produces the same result.
False.
Each time RANDOM is called it may produce a different result, even with the same arguments.
What are the possible values displayed by this code segment?
```
num ← RANDOM(2, 4)
```
```
DISPLAY(num * 10)
```
The possible values are 20, 30, and 40, because num can be 2, 3, or 4.
Name two common uses of random values in programs.
Common uses include simulating events, generating test data, and creating games.

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