| .\" Copyright (c) 2004 David Schultz <das@FreeBSD.org> |
| .\" All rights reserved. |
| .\" |
| .\" Redistribution and use in source and binary forms, with or without |
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| .\" 2. Redistributions in binary form must reproduce the above copyright |
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| .\" |
| .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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| .\" $FreeBSD: src/lib/msun/man/fdim.3,v 1.1 2004/06/30 07:04:01 das Exp $ |
| .\" |
| .Dd June 29, 2004 |
| .Dt FDIM 3 |
| .Os |
| .Sh NAME |
| .Nm fdim , |
| .Nm fdimf , |
| .Nm fdiml |
| .Nd positive difference functions |
| .Sh LIBRARY |
| .Lb libm |
| .Sh SYNOPSIS |
| .In math.h |
| .Ft double |
| .Fn fdim "double x" "double y" |
| .Ft float |
| .Fn fdimf "float x" "float y" |
| .Ft long double |
| .Fn fdiml "long double x" "long double y" |
| .Sh DESCRIPTION |
| The |
| .Fn fdim , |
| .Fn fdimf , |
| and |
| .Fn fdiml |
| functions return the positive difference between |
| .Fa x |
| and |
| .Fa y . |
| That is, if |
| .Fa x\- Ns Fa y |
| is positive, then |
| .Fa x\- Ns Fa y |
| is returned. |
| If either |
| .Fa x |
| or |
| .Fa y |
| is an \*(Na, then an \*(Na is returned. |
| Otherwise, the result is |
| .Li +0.0 . |
| .Pp |
| Overflow or underflow may occur iff the exact result is not |
| representable in the return type. |
| No other exceptions are raised. |
| .Sh SEE ALSO |
| .Xr fabs 3 , |
| .Xr fmax 3 , |
| .Xr fmin 3 , |
| .Xr math 3 |
| .Sh STANDARDS |
| The |
| .Fn fdim , |
| .Fn fdimf , |
| and |
| .Fn fdiml |
| functions conform to |
| .St -isoC-99 . |
| .Sh HISTORY |
| These routines first appeared in |
| .Fx 5.3 . |