ecvt(3C)                                                           ecvt(3C)

NAME
     ecvt, fcvt, gcvt - convert floating-point number to string

SYNOPSIS
     #include <stdlib.h>

     char *ecvt(double value, int ndigit, int *decpt, int *sign);

     char *fcvt(double value, int ndigit, int *decpt, int *sign);

     char *gcvt(double value, int ndigit, char *buf);

DESCRIPTION
     The ecvt(), fcvt() and gcvt() functions convert floating-point numbers
     to null-terminated strings.

     ecvt() converts value to a null-terminated string of ndigit digits
     (where ndigit is reduced to an unspecified limit determined by the
     precision of a double) and returns a pointer to the string. The high-
     order digit is non-zero, unless the value is 0. The low-order digit is
     rounded. The position of the radix character relative to the beginning
     of the string is stored in the integer pointed to by decpt (negative
     means to the left of the returned digits). The radix character is not
     included in the returned string. If the sign of the result is nega-
     tive, the integer pointed to by sign is non-zero, otherwise it is 0.

     If the converted value is out of range or is not representable, the
     contents of the returned string are unspecified.

     fcvt() is identical to ecvt() except that ndigit specifies the number
     of digits desired after the radix point. The total number of digits in
     the result string is restricted to an unspecified limit as determined
     by the precision of a double.

     gcvt() converts value to a null-terminated string (similar to that of
     the %g format of printf()) in the array pointed to by buf and returns
     buf. It produces ndigit significant digits (limited to an unspecified
     value determined by the precision of a double) in %f if possible, or
     %e (scientific notation) otherwise. A minus sign is included in the
     returned string if value is less than 0. A radix character is included
     in the returned string if value is not a whole number. Trailing zeros
     are suppressed where value is not a whole number. The radix character
     is determined by the current locale. If setlocale() has not been
     called successfully, the default locale, "POSIX", is used. The default
     locale specifies a period (.) as the radix character. The LCNUMERIC
     category determines the value of the radix character within the
     current locale.








Page 1                       Reliant UNIX 5.44                Printed 11/98

ecvt(3C)                                                           ecvt(3C)

RETURN VALUE
     The ecvt() and fcvt() functions return a pointer to a null-terminated
     string of digits.

     The gcvt() function returns buf.

NOTES
     The values returned by ecvt() and fcvt() point to a single static data
     array whose content is overwritten by each call.

SEE ALSO
     setlocale(3C), printf(3S), stdlib(5).










































Page 2                       Reliant UNIX 5.44                Printed 11/98