NAME

iszero, isnormal, issubnormal, signbit − Determine properties of IEE double-precision floating point numbers. 

SYNOPSIS

int
iszero(value)
int
isnormal(value)
int
issubnormal(value)
int
signbit(value)

ARGUMENTS

double value   (in) Double-precision floating point number to check. 
 

DESCRIPTION

isnormal returns 1 if its argument is an IEEE double-precision normal floating-point number.  isnormal returns 0 otherwise. 

issubnormal returns 1 if its argument is an IEEE double-precision subnormal floating-point number.  isnormal returns 0 otherwise. 

iszero returns 1 if its argument is an IEEE double-precision 0.  isnormal returns 0 otherwise. 

signbit returns 1 if its argument is an IEEE double-precision floating-point number with sign bit set.  isnormal returns 0 otherwise. 

KEYWORDS

not a number, infinity, IEEE, double

Sprite version 1.0  —  October 12, 1990