Display of fractional numbers is controlled by the `d o`
(`calc-over-notation`

) command. By default, a number like
eight thirds is displayed in the form ``8:3'`. The `d o` command
prompts for a one- or two-character format. If you give one character,
that character is used as the fraction separator. Common separators are
``:'` and ``/'`. (During input of numbers, the `:` key must be
used regardless of the display format; in particular, the `/` is used
for RPN-style division, *not* for entering fractions.)

If you give two characters, fractions use "integer-plus-fractional-part"
notation. For example, the format ``+/'` would display eight thirds
as ``2+2/3'`. If two colons are present in a number being entered,
the number is interpreted in this form (so that the entries `2:2:3`
and `8:3` are equivalent).

It is also possible to follow the one- or two-character format with
a number. For example: ``:10'` or ``+/3'`. In this case,
Calc adjusts all fractions that are displayed to have the specified
denominator, if possible. Otherwise it adjusts the denominator to
be a multiple of the specified value. For example, in ``:6'` mode
the fraction 1:6 will be unaffected, but 2:3 will be
displayed as 4:6, 1:2 will be displayed as 3:6,
and 1:8 will be displayed as 3:24. Integers are also
affected by this mode: 3 is displayed as 18:6. Note that the
format ``:1'` writes fractions the same as ``:'`, but it writes
integers as n:1.

The fraction format does not affect the way fractions or integers are stored, only the way they appear on the screen. The fraction format never affects floats.

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