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OpenSolaris 2009.06 - man page for remainder (opensolaris section 3m)

remainder(3M)						  Mathematical Library Functions					     remainder(3M)

NAME
remainder, remainderf, remainderl - remainder function
SYNOPSIS
c99 [ flag... ] file... -lm [ library... ] #include <math.h> double remainder(double x, double y); float remainderf(float x, float y); long double remainderl(long double x, long double y);
DESCRIPTION
These functions return the floating point remainder r = x - ny when y is non-zero. The value n is the integral value nearest the exact value x/y. When |n - x/y| = 1/2, the value n is chosen to be even. The behavior of remainder() is independent of the rounding mode.
RETURN VALUES
Upon successful completion, these functions return the floating point remainder r = x - ny when y is non-zero. If x or y is NaN, a NaN is returned. If x is infinite or y is 0 and the other is non-NaN, a domain error occurs and a NaN is returned.
ERRORS
These functions will fail if: Domain Error The x argument is +-Inf, or the y argument is +-0 and the other argument is non-NaN. If the integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero, then the invalid floating-point exception is raised. The remainder() function sets errno to EDOM if y argument is 0 or the x argument is positive or negative infinity.
USAGE
An application wanting to check for error situations can set errno to 0 before calling remainder(). On return, if errno is non-zero, an error has occurred. The remainderf() and remainderl() functions do not set errno.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+
SEE ALSO
abs(3C), div(3C), feclearexcept(3M), fetestexcept(3M), attributes(5), standards(5) SunOS 5.11 12 Jul 2006 remainder(3M)

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