NAME
    dbf - convert FFP dual-binary number to FFP format

SYNOPSIS
    fnum = dbf(exp, mant);

FUNCTION
    Accepts a dual-binary format (described below) floating point
    number and converts it to an FFP format floating point number.
    The dual-binary format is defined as:

            exp bit  16     = sign (0=>positive, 1=>negative)
            exp bits 15-0   = binary integer representing the base
                                      ten (10) exponent
            man             = binary integer mantissa

INPUTS
    exp - binary integer representing sign and exponent
    mant - binary integer representing the mantissa

RESULT
    fnum - converted FFP floating point format number

BUGS
    None