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fdim(3m) [sunos man page]

fdim(3M)						  Mathematical Library Functions						  fdim(3M)

NAME
fdim, fdimf, fdiml - compute positive difference between two floating-point numbers SYNOPSIS
cc [ flag... ] file... -lm [ library... ] #include <math.h> double fdim(double x, double y); float fdimf(float x, float y); long double fdiml(long double x, long double y); DESCRIPTION
These functions determine the positive difference between their arguments. If x is greater than y, x-y is returned. If x is less than or equal to y, +0 is returned. RETURN VALUES
Upon successful completion, these functions return the positive difference value. If x-y is positive and overflows, a range error occurs and fdim(), fdimf(), and fdiml() returns the value of the macro HUGE_VAL, HUGE_VALF, and HUGE_VALL, respectively. If x or y is NaN, a NaN is returned. ERRORS
These functions will fail if: Range Error The result overflows. If the integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero, the overflow floating-point exception will be raised. USAGE
An application wanting to check for exceptions should call feclearexcept(FE_ALL_EXCEPT) before calling these functions. On return, if fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an exception has been raised. An application should either examine the return value or check the floating point exception flags to detect exceptions. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
feclearexcept(3M), fetestexcept(3M), fmax(3M), fmin(3M), math.h(3HEAD), attributes(5), standards(5) SunOS 5.10 1 Sep 2002 fdim(3M)

Check Out this Related Man Page

FDIM(3P)						     POSIX Programmer's Manual							  FDIM(3P)

PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the correspond- ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux. NAME
fdim, fdimf, fdiml - compute positive difference between two floating-point numbers SYNOPSIS
#include <math.h> double fdim(double x, double y); float fdimf(float x, float y); long double fdiml(long double x, long double y); DESCRIPTION
These functions shall determine the positive difference between their arguments. If x is greater than y, x- y is returned. If x is less than or equal to y, +0 is returned. An application wishing to check for error situations should set errno to zero and call feclearexcept(FE_ALL_EXCEPT) before calling these functions. On return, if errno is non-zero or fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an error has occurred. RETURN VALUE
Upon successful completion, these functions shall return the positive difference value. If x- y is positive and overflows, a range error shall occur and fdim(), fdimf(), and fdiml() shall return the value of the macro HUGE_VAL, HUGE_VALF, and HUGE_VALL, respectively. If x- y is positive and underflows, a range error may occur, and either ( x- y) (if representable), or 0.0 (if supported), or an imple- mentation-defined value shall be returned. If x or y is NaN, a NaN shall be returned. ERRORS
The fdim() function shall fail if: Range Error The result overflows. If the integer expression (math_errhandling & MATH_ERRNO) is non-zero, then errno shall be set to [ERANGE]. If the integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero, then the overflow floating-point exception shall be raised. The fdim() function may fail if: Range Error The result underflows. If the integer expression (math_errhandling & MATH_ERRNO) is non-zero, then errno shall be set to [ERANGE]. If the integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero, then the underflow floating-point exception shall be raised. The following sections are informative. EXAMPLES
None. APPLICATION USAGE
On implementations supporting IEEE Std 754-1985, x- y cannot underflow, and hence the 0.0 return value is shaded as an extension for imple- mentations supporting the XSI extension rather than an MX extension. On error, the expressions (math_errhandling & MATH_ERRNO) and (math_errhandling & MATH_ERREXCEPT) are independent of each other, but at least one of them must be non-zero. RATIONALE
None. FUTURE DIRECTIONS
None. SEE ALSO
feclearexcept(), fetestexcept(), fmax(), fmin(), the Base Definitions volume of IEEE Std 1003.1-2001, Section 4.18, Treatment of Error Con- ditions for Mathematical Functions, <math.h> COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol- ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html . IEEE
/The Open Group 2003 FDIM(3P)

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