[unix-history] / usr / src / lib / libc / gen / isinf.3

.\" Copyright (c) 1991 The Regents of the University of California.
.\" All rights reserved.
.\"
.\" %sccs.include.redist.man%
.\"
.\"	@(#)isinf.3	5.1 (Berkeley) %G%
.\"
.TH ISINF 3 ""
.UC 7
.SH NAME
isinf, isnan \- return if infinity or not-a-number
.SH SYNOPSIS
.nf
.ft B
int isinf(double);
int isnan(double);
.fr R
.fi
.SH DESCRIPTION
.I Isninf
returns 1 if the number is ``infinity'', otherwise 0.
.PP
.I Isnan
returns 1 if the number is ``NaN'', otherwise 0.
.SH SEE ALSO
.IR math (3)
.sp
.IR "IEEE Standard for Binary Floating-Point Arithmetic" ,
ANSI/IEEE Std 754-1985
.SH BUGS
Neither the VAX nor the Tahoe floating point have distinguished values
for either infinity or not-a-number.
These routines always return 0 on those architectures.
Commit	Line	Data
26c1d2b2 KB	1	.\" Copyright (c) 1991 The Regents of the University of California.
	2	.\" All rights reserved.
	3	.\"
	4	.\" %sccs.include.redist.man%
	5	.\"
	6	.\" @(#)isinf.3 5.1 (Berkeley) %G%
	7	.\"
	8	.TH ISINF 3 ""
	9	.UC 7
	10	.SH NAME
	11	isinf, isnan \- return if infinity or not-a-number
	12	.SH SYNOPSIS
	13	.nf
	14	.ft B
	15	int isinf(double);
	16	int isnan(double);
	17	.fr R
	18	.fi
	19	.SH DESCRIPTION
	20	.I Isninf
	21	returns 1 if the number is ``infinity'', otherwise 0.
	22	.PP
	23	.I Isnan
	24	returns 1 if the number is ``NaN'', otherwise 0.
	25	.SH SEE ALSO
	26	.IR math (3)
	27	.sp
	28	.IR "IEEE Standard for Binary Floating-Point Arithmetic" ,
	29	ANSI/IEEE Std 754-1985
	30	.SH BUGS
	31	Neither the VAX nor the Tahoe floating point have distinguished values
	32	for either infinity or not-a-number.
	33	These routines always return 0 on those architectures.