new_value

    OpenVMS usage:IEEE precision mode
    type:         longword (unsigned)
    access:       read only
    mechanism:    by value
    The new value can be one of the following:

    Symbol                          ValueMeaning

    IEEE$C_PM_NO_CHANGE             -1   No change. Just get previous
                                         value
    IEEE$C_PM_SINGLE                0    Single Precision
    IEEE$C_PM_DOUBLE                2    Double Precision
    IEEE$C_PM_DOUBLE_EXTENDED       3    Double-Extended Precision

 prev_value

    OpenVMS usage:IEEE precision mode
    type:         longword (unsigned)
    access:       write only
    mechanism:    by reference
    The previous value is a pointer to a return value that can be one
    of the last three items from the table showing new values.