econvert(3C)						   Standard C Library Functions 					      econvert(3C)

NAME

       econvert, fconvert, gconvert, seconvert, sfconvert, sgconvert, qeconvert, qfconvert, qgconvert - output conversion

SYNOPSIS

       #include <floatingpoint.h>

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

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

       char *gconvert(double value, int ndigit, int trailing, char *buf);

       char *seconvert(single *value, int ndigit, int *decpt, int *sign, char *buf);

       char *sfconvert(single *value, int ndigit, int *decpt, int *sign, char *buf);

       char *sgconvert(single *value, int ndigit, int trailing, char *buf);

       char *qeconvert(quadruple *value, int ndigit, int *decpt, int *sign, char *buf);

       char *qfconvert(quadruple *value, int ndigit, int *decpt, int *sign, char *buf);

       char *qgconvert(quadruple *value, int ndigit, int trailing, char *buf);

DESCRIPTION

       The  econvert()	function  converts  the  value to a null-terminated string of ndigit ASCII digits in buf and returns a pointer to buf. buf
       should contain at least ndigit+1 characters. The position of the decimal point relative to the beginning of the string is stored indirectly
       through	decpt.	Thus buf == "314" and *decpt == 1 corresponds to the numerical value 3.14, while buf == "314" and *decpt == -1 corresponds
       to the numerical value .0314. If the sign of the result is negative, the word pointed to by sign is nonzero; otherwise  it  is  zero.   The
       least significant digit is rounded.

       The  fconvert()	function  works much like econvert(), except that the correct digit has been rounded as if for	sprintf(%w.nf) output with
       n=ndigit digits to the right of the decimal point. ndigit can be negative to indicate rounding to the left of the decimal point. The return
       value is a pointer to buf. buf should contain at least 310+max(0,ndigit) characters to accomodate any double-precision value.

       The  gconvert()	function converts the value to a null-terminated ASCII string in buf and returns a pointer to buf. It produces ndigit sig-
       nificant digits in fixed-decimal format, like  sprintf(%w.nf), if possible, and otherwise in floating-decimal format, like  sprintf(%w.ne);
       in either case buf is ready for printing, with sign and exponent. The result corresponds to that obtained by

       (void) sprintf(buf,``%w.ng'',value) ;

       If  trailing  =	0, trailing zeros and a trailing point are suppressed, as in  sprintf(%g). If trailing != 0, trailing zeros and a trailing
       point are retained, as in  sprintf(%#g).

       The seconvert(), sfconvert(), and sgconvert() functions are single-precision versions of these functions, and are more efficient  than  the
       corresponding double-precision versions. A pointer rather than the value itself is passed to avoid C's usual conversion of single-precision
       arguments to double.

       The qeconvert(), qfconvert(), and qgconvert() functions are quadruple-precision versions of these functions. The qfconvert()  function  can
       overflow the  decimal_record field  ds if  value is too large. In that case, buf[0] is set to zero.

       The  ecvt(),  fcvt()  and gcvt() functions are versions of econvert(), fconvert(), and gconvert(), respectively, that are documented on the
       ecvt(3C) manual page.  They constitute the default implementation of these functions and conform to the X/Open  CAE  Specification,  System
       Interfaces and Headers, Issue 4, Version 2.

USAGE

       IEEE  Infinities  and NaNs are treated similarly by these functions. ``NaN'' is returned for NaN, and ``Inf'' or ``Infinity'' for Infinity.
       The longer form is produced when ndigit >= 8.

ATTRIBUTES

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

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       ecvt(3C),sprintf(3C), attributes(5)

SunOS 5.10							    3 May 1999							      econvert(3C)