AP CS A Unit 3

Block of Statements

Block of Statements

One or more statements enclosed in an open curly brace

'{' and a closing curly brace '}'.

Boolean expression

A mathematical or logical expression that is either true or false.

complex conditional

A Boolean expression with two or more conditions joined

by a logical and '&&' or a logical or '||'.

conditional

Used to execute code only if a Boolean expression is true.

DeMorgan's Laws

Rules about how to distribute a negation on a complex conditional.

logical and(&&)

Used to only execute the following statement or block of statements if both conditions are true

logical or( || )

Used to execute the following statement or block of statements if one of the conditions are true

negation( ! )

turns a true statement false and a false statement true

short circuit evaluation

The type of evaluation used for logical and '&&' and logical or '||' expressions. If the first condition is false in a complex conditional with a logical and the second condition won't be evaluated. If the first condition is true is a complex conditional with a logical or the second condition won't be evaluated.

if (Boolean expression)

used to start a conditional statement. This is followed by a statement or a block of statements that will be executed if the Boolean expression is true.

else

used to execute a statement or block of statements if the Boolean expression on the if part was false.

else if (Boolean expression)

used to have 3 or more possible outcomes such as if x is equal, x is greater than, or x is less than some value. It will only execute if the condition in the 'if' was false and the condition in the else if is true.