A condition is an expression that evaluates to a Boolean value - true or false. At this point, there are two main types of conditions.

• relational expressions
• logical or Boolean expressions

Note: An arithmetic expression evaluates to a number literal value. A string expression evaluates to a string literal value.

Relational expressions take arithmetic, character, or logical operands and evaluate to logical values.

Logical expressions take logical operands and evaluate to logical values.

This will be covered in more detail later.

The following table shows relational operators used to compare two values.

Relational operators
Computer	Math	English description
<	<	less than
>=	≥	greater than or equal to
<=	≤	less than or equal to
>	>	greater than
==	=	equal to
!=	≠	not equal to

Here are some examples of relational operators using literals. On the left is the expression. On the right is the Boolean/logical value to which it reduces.

Relational operator examples using literals
Relational Expression	Reduced Value
2 < 3	true
3 > 2	false
2 >= 2	true
2 >= 3	false
2 <= 2	true
3 <= 2	false
3 == 3	true
2 == 3	false
3 != 3	false
2 != 3	true

Never compare floating point approximations for equality or inequality.

Never compare values of different types.

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