ECVT(3C) (C Programming Language Utilities) ECVT(3C)
NAME
ecvt, fcvt, gcvt - convert floating-point number to string
SYNOPSIS
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
ecvt 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.
Page 1 May 1989
ECVT(3C) (C Programming Language Utilities) ECVT(3C)
SEE ALSO
printf(3S).
BUGS
The values returned by ecvt and fcvt point to a single
static data array whose content is overwritten by each call.
Page 2 May 1989