AP Computer Science Unit 3: Boolean Expressions

Boolean

an expression or statement that returns True or False

Selection statement

statements used to determine whether code should be run or skipped

DeMorgans law

Set of rules for converting an expression that contains NOTs into one without any NOTs

If statement

a conditional statement that runs when the condition is true; it helps control the flow of the program

What is ‘==’?

equal to

What is ‘!=’?

not equal to

What is ‘<=’?

less than or equal to

What is ‘<‘?

less than

What is ‘>’?

greater than

What is ‘>=’?

greater than or equal to

Yoda Notation

When the variable is put on the right side of a comparison

Nesting

When a selection is placed inside a selection

Scope

refers to the area where a variable exists and can be used

Conjunction Operators

operators that combine two boolean values and produce a new result

The AND conjunction returns true when?

The AND project produces a true value when both of its operands are True

The OR conjunction returns true when?

The OR conjunction is true when one value in it’s operands is true

What is ‘&&’?

logical AND operator

What is ‘| |’

logical OR operator

What is ‘!”

logical NOT

Comparison Operator

operators that are used to compare two values

What does equals(Object o) do?

returns True if the called object is equal to the received object

What does compareTo(Object o) do?

Returns 0 if the called and received object are the same

Returns a positive number when the received object is smaller than the called object

Returns a negative number when the received object is greater than the called object

short circuiting

The process of not evaluating the right operand in a Boolean expression/statement