Originální popis anglicky:
ecvt, fcvt - convert a floating-point number to a string
Návod, kniha: Linux Programmer's Manual
#include <stdlib.h>
char *ecvt(double number, int ndigits, int
*decpt, int *sign);
char *fcvt(double number, int ndigits, int
*decpt, int *sign);
The
ecvt() function converts
number to a null-terminated string of
ndigits digits (where
ndigits is reduced to an system-specific
limit determined by the precision of a double), and returns a pointer to the
string. The high-order digit is nonzero, unless
number is zero. The low
order digit is rounded. The string itself does not contain a decimal point;
however, the position of the decimal point relative to the start of the string
is stored in *
decpt. A negative value for *
decpt means that the
decimal point is to the left of the start of the string. If the sign of
number is negative, *
sign is set to a non-zero value, otherwise
it's set to 0. If
number is zero, it is unspecified whether *
decpt is 0 or 1.
The
fcvt() function is identical to
ecvt(), except that
ndigits specifies the number of digits after the decimal point.
Both the
ecvt() and
fcvt() functions return a pointer to a static
string containing the ASCII representation of
number. The static string
is overwritten by each call to
ecvt() or
fcvt().
These functions are obsolete. Instead,
sprintf() is recommended. Linux
libc4 and libc5 specified the type of
ndigits as
size_t. Not all
locales use a point as the radix character (`decimal point').
SysVR2, XPG2
ecvt_r(3),
gcvt(3),
qecvt(3),
setlocale(3),
sprintf(3)
