isnan — C Library Procedures

NAME

isnan, isinf − Determine whether double-precision floating point numbers are not-a-number or infinity.

SYNOPSIS

int
isnan(value)
int
isinf(value)

ARGUMENTS

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

DESCRIPTION

isnan returns 1 if its argument is an IEEE double-precision floating-point number corresponding to NaN (not a number). isnan returns 0 otherwise.

isinf returns 1 if its argument is an IEEE double-precision floating-point number corresponding to infinity. isinf returns 0 otherwise.

KEYWORDS

not a number, infinity, IEEE, double