ecvt(S)                        6 January 1993                        ecvt(S)


 Name

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

 Syntax


    cc ... -lc


    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

    The ecvt function 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 up if its value
    is 5 or greater and rounded down if it is less than 5.  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 if possible, otherwise E-format, ready for
    printing.  A minus sign, if there is one, or a decimal point is included
    as part of the returned string.  Trailing zeros are suppressed.

 Notes

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

 See also

    printf(S)

 Standards conformance

    ecvt, fcvt and gcvt are conformant with:
    Intel386 Binary Compatibility Specification, Edition 2 (iBCSe2).