ecvt(3C)                                                 ecvt(3C)



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

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

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

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

DESCRIPTION
     ecvt converts value to a null-terminated string of ndigit
     digits and returns a pointer to this string.  The high-order
     digit is non-zero, unless the value is zero.  The low-order
     digit is rounded.  The position of the decimal point
     relative to the beginning of the string is stored indirectly
     through decpt (negative means to the left of the returned
     digits).  The decimal point is not included in the returned
     string.  If the sign of the result is negative, the word
     pointed to by sign is non-zero; otherwise it is zero.

     fcvt is identical to ecvt, except that the correct digit has
     been rounded for printf %f (Fortran F-format) output of the
     number of digits specified by ndigit.

     gcvt converts the value to a null-terminated string in the
     array pointed to by buf and returns buf.  It attempts to
     produce ndigit significant digits in Fortran F-format, ready
     for printing; E-format is produced when F-format is not
     possible.  A minus sign, if there is one, or a decimal point
     is included as part of the returned string.  Trailing zeros
     are suppressed.

LIMITATIONS
     The values returned by ecvt and fcvt point to a single
     static data array.

SEE ALSO
     printf(3S)









January 1992                                                    1