04-22-2008
isdigit() is doing what it is supposed to do. It filters out the character stream into digits and non-digits. So the minus will be discarded as not being a digit. Change the code so that it skips over the sign and after reading in the digit prepend the sign to it.
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ldcvt(3C) ldcvt(3C)
NAME
_ldecvt(), _ldfcvt(), _ldgcvt() - convert long-double floating-point number to string
SYNOPSIS
Obsolescent Interfaces
DESCRIPTION
converts value to a null-terminated string of ndigit digits and returns a pointer to the string. The high-order digit is non-zero,
unless the value is zero. The low-order digit is rounded. The position of the radix character relative to the beginning of
the string is stored indirectly through decpt (negative means to the left of the returned digits). The radix character is
not included in the returned string. If the sign of the result is negative, the word pointed to by sign is non-zero; other-
wise it is zero.
is identical to
except that the correct digit has been rounded for printf (FORTRAN F-format) output of the number of digits specified by
ndigit.
Convert the value to a null-terminated string in the array pointed to by buf and return buf. It produces ndigit significant digits in
FORTRAN F-format if possible, or E-format otherwise. A minus sign, if required, and a radix character are included in the
returned string. Trailing zeros are suppressed. The radix character is determined by the currently loaded NLS environment
(see setlocale(3C)). If has not been called successfully, the default NLS environment, "C" is used (see lang(5)). The
default environment specifies a period as the radix character.
Obsolescent Interfaces
convert long-double floating-point number to string.
RETURN VALUE
is returned for Not-a-Number, and is returned for Infinity.
WARNINGS
The values returned by and point to data whose content is overwritten by subsequent calls to these interfaces by the same thread.
and are obsolescent interfaces supported only for compatibility with existing DCE applications. New multithreaded applications should use
and
EXTERNAL INFLUENCES
Locale
The category determines the radix character.
International Code Set Support
Single-byte character code sets are supported.
AUTHOR
and were developed by HP.
SEE ALSO
setlocale(3C), printf(3S), lang(5), thread_safety(5).
ldcvt(3C)