ECVT(S) UNIX System V ECVT(S)
Name
ecvt, fcvt, gcvt - convert floating-point number to string
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;
int ndigit;
char *buf;
Description
The ecvt function converts value to a null-terminated string
of ndigit digits and returns a pointer thereto. The high-
order digit is non-zero, unless the value is zero. The
low-order digit is rounded. The position of the decimal
point relative to the beginning of the string is stored
indirectly through decpt (negative means to the left of the
returned digits). The decimal point is not included in the
returned string. If the sign of the result is negative, the
word pointed to by sign is non-zero, otherwise it is zero.
fcvt is identical to ecvt, except that the correct digit has
been rounded for printf ``%f'' (FORTRAN F-format) output of
the number of digits specified by ndigit.
gcvt converts the value to a null-terminated string in the
array pointed to by buf and returns buf. It attempts to
produce ndigit significant digits in FORTRAN F-format if
possible, otherwise E-format, ready for printing. A minus
sign, if there is one, or a decimal point will be included
as part of the returned string. Trailing zeros are
suppressed.
See Also
printf(S).
Notes
The values returned by ecvt and fcvt point to a single
static data array whose content is overwritten by each call.
Standards Conformance
ecvt, fcvt and gcvt are conformant with:
The X/Open Portability Guide II of January 1987.
(printed 6/20/89)