ecvt(3C)						   Standard C Library Functions 						  ecvt(3C)

NAME

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

SYNOPSIS

       #include <stdlib.h>

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

       char *fcvt(double value, int ndigit, int *restrict decpt, int *restrict 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()
       The ecvt() function 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 negative, 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()
       The fcvt() function is identical to ecvt() except that ndigit specifies the number of digits desired after the radix point.  The total num-
       ber of digits in the result string is restricted to an unspecified limit as determined by the precision of a double.

   gcvt()
       The gcvt() function converts value to a null-terminated string (similar to that of the %g format of printf(3C)) 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 num-
       ber.  The radix character is determined by the current locale. If setlocale(3C) has not	been  called  successfully,  the  default  locale,
       POSIX,  is  used.   The	default locale specifies a period (.) as the radix character.  The LC_NUMERIC category determines the value of the
       radix character within the current locale.

RETURN VALUES

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

       The gcvt() function returns buf.

ERRORS

       No errors are defined.

USAGE

       The return values from ecvt() and fcvt() might point to thread-specific data that can be overwritten by subsequent calls to these functions
       by the same thread.

       For portability to implementations conforming to earlier versions of Solaris, sprintf(3C) is preferred over this function.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       printf(3C), setlocale(3C), sprintf(3C), attributes(5), standards(5)

SunOS 5.10							    18 May 2004 							  ecvt(3C)