# MirOS Manual: arithmetic(6)

```ARITHMETIC(6)                BSD Reference Manual                ARITHMETIC(6)
```

## NAME

```     arithmetic - quiz on simple arithmetic
```

## SYNOPSIS

```     arithmetic [-o +-x/] [-r range]
```

## DESCRIPTION

```     arithmetic asks you to solve problems in simple arithmetic. Each question
must be answered correctly before going on to the next. After every 20
problems, it prints the score so far and the time taken. You can quit at
any time by typing the interrupt or end-of-file character.

The options are as follows:

0 to 10, and corresponding subtraction. By supplying one or more
subtraction, multiplication, and division, respectively. If you
give one of these characters more than once, that kind of problem
will be asked correspondingly more often.

-r      If a range is supplied, arithmetic selects the numbers in its
problems in the following way. For addition and multiplication,
the numbers to be added or multiplied are between 0 and range,
inclusive. For subtraction and division, both the required result
and the number to divide by or subtract will be between 0 and
range. (Of course, arithmetic will not ask you to divide by 0.)
The default range is 10.

When you get a problem wrong, arithmetic will remember the numbers in-
volved, and will tend to select those numbers more often than others, in
problems of the same sort. Eventually it will forgive and forget.

arithmetic cannot be persuaded to tell you the right answer. You must
work it out for yourself.
```

## DIAGNOSTICS

```     "What?" if you get a question wrong. "Right!" if you get it right.
"Please type a number." if arithmetic doesn't understand what you typed.
```

```     bc(1), dc(1)