ecvt(3C)                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 *decpt, int *sign);

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

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

DESCRIPTION
     ecvt converts value to a null-terminated  string  of  ndigit
     digits  and returns a pointer thereto.  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 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 %f format if  possible,
     otherwise  %e format (scientific notation), ready for print-
     ing. A minus sign, if there is one, or a decimal point  will
     be  included as part of the returned string.  Trailing zeros
     are suppressed.

SEE ALSO
     printf(3S).

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














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