ecvt(3)ecvt(3)Name
ecvt, fcvt, gcvt - output conversion
Syntax
char *ecvt(value, ndigit, decpt, sign)
double value;
int ndigit, *decpt, *sign;
char *fcvt(value, ndigit, decpt, sign)
double value;
int ndigit, *decpt, *sign;
char *gcvt(value, ndigit, buf)
double value;
char *buf;
Description
The routine converts the value to a null-terminated string of ndigit
ASCII digits and returns a pointer thereto. 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). If
the sign of the result is negative, the word pointed to by sign is non-
zero, otherwise it is zero. The low-order digit is rounded.
The routine is identical to except that the correct digit has been
rounded for FORTRAN F-format output of the number of digits specified
by ndigits.
The routine converts the value to a null-terminated ASCII string in buf
and returns a pointer to buf. It attempts to produce ndigit signifi‐
cant digits in FORTRAN F format if possible, otherwise E format is
used, ready for printing. Trailing zeros may be suppressed.
The symbol used to represent a radix character is obtained from the
last successful call to category The symbol can be determined by call‐
ing:
nl_langinfo (RADIXCHAR);
If category has not been called successfully, or if the radix character
is not defined for a supported language, the radix character defaults
to a period (.).
International Environment
LC_NUMERIC If this environment is set and valid, uses the interna‐
tional language database named in the definition to
determine radix character rules.
LANG If this environment is set and valid, uses the interna‐
tional language database named in the definition to
determine radix character rules. If is defined, its def‐
inition supercedes the definition of
Restrictions
The return values point to static data whose content is overwritten by
each call.
See Alsosetlocale(3), nl_langinfo(3int), printf(3int), printf(3s)
Guide to Developing International Software
ecvt(3)
