zerop (Function)

Syntax:

Pronunciation:

[ˈzē(ˌ)rō(ˌ)pē]

Arguments and Values:

number—a number.

generalized-boolean—a generalized boolean.

Description:

Returns true if number is zero (integer, float, or complex); otherwise, returns false.

Regardless of whether an implementation provides distinct representations for positive and negative floating-point zeros, (zerop -0.0) always returns true.

Examples:

 (zerop 0) → true
 (zerop 1) → false
 (zerop -0.0) → true
 (zerop 0/100) → true
 (zerop #c(0 0.0)) → true

Exceptional Situations:

Should signal an error of type type-error if number is not a number.

Notes:

 (zerop number) ≡ (= number 0)