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This chapter groups a wide variety of mathematical functions. The corresponding definitions and declarations are in `math.h'. Two definitions from `math.h' are of particular interest.
doubleis defined as
HUGE_VAL; this number is returned on overflow by many functions.
exceptionis used when you write customized error handlers for the mathematical functions. You can customize error handling for most of these functions by defining your own version of
matherr; see the section on
Since the error handling code calls
fputs, the mathematical
subroutines require stubs or minimal implementations for the same list
of OS subroutines as
See section `System Calls' in The Cygnus C Support Library,
for a discussion and for sample minimal implementations of these support
Alternative declarations of the mathematical functions, which exploit specific machine capabilities to operate faster--but generally have less error checking and may reflect additional limitations on some machines--are available when you include `fastmath.h' instead of `math.h'.
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