AP Computer Science Principles Unit 4 Review

What is an expression?

• A reference to a value or expression that can be repeatedly used throughout a program.

• A combination of both values and operators that evaluate to one value

• A named group of programming instructions that is also referred to as a “procedure”.

A (a)   evaluates to true or false

When coding, it is best to avoid using __________ or the code may be confusing.

• Global variables

• Conditionals

• Functions

• Local variables

Global variables are _____________ and ___________________. (Choose 2)

• Temporary

• Can be used anywhere in your code

• Permanent

• Can only be used in the section of code they were created in

Local variables are _______ and __________. (Choose 2)

• Permanent

• Can only be used in the section where it was created

• Can be used anywhere in your code

• Temporary

(a)   keep your code from getting cluttered.

A function is...

• A named group of programming instructions. Also referred to as a “procedure”.

• A combination of operators and values that evaluates to a single value.

• A reference to a value or expression that can be used repeatedly throughout a program.

What does the symbol below mean in a Boolean expression?

&&

(Choose 2)

• And

• Only one of the statements must be true

• Or

• Both statements must be true

What does the symbol below mean in a Boolean expression?

||

(Choose 2)

• And

• Only one of the statements must be true

• Or

• Both statements must be true

For a function to work, you must (a)   it.