ecvt, fcvt - convert a floating-point number to a string.
char *ecvt(double number, int ndigits, int *decpt, int
char *fcvt(double number, int ndigits, int *decpt, int
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 con
tain 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
Both the ecvt() and fcvt() functions return a pointer to a
static string containing the ASCII representation of num
ber. The static string is overwritten by each call to
ecvt() or fcvt().
These functions are obsolete. Instead, sprintf() is recom
mended. Linux libc4 and libc5 specified the type of ndig
its as size_t. Not all locales use a point as the radix
character (`decimal point').
gcvt(3), setlocale(3), sprintf(3)