Simple fraction calculator

csq -

calculatorsquared, or just calculator²

Fancy command-line calculator that uses fractions instead of decimal floating point numbers.

It works like any other calculator, with exception of division, which returns
a fraction. After evaluation, the result is reduced, so `21 / 7 = 3/1 = 3`

.
Basic line editing is also provided. Press `Ctrl+D`

to quit.

Syntax reference:

`a + b`

,`a - b`

,`a * b`

,`a / b`

- self-explanatory`a ^ b`

- raises*a*to the power of*b*,*b*must have denominator of 1`a % b`

- returns the remainder from divsion of*a*by*b*, both must have denominator of 1`(expression)`

- sets highest precedence for*expression*`$N`

- returns the value of*N*-th expression`sqrt a`

- returns a very approximated square root of*a*`mixed 1|0`

- enables or disables mixed fraction display

Example:

```
$ csq
(1) 21 / 7 = 3
(2) 7 / 21 = 1/3
(3) $2 * 3 = 1
(4) sqrt 64 = 8
```

At build time, a recent Hare toolchain is required.

```
$ make
# make install
```

Please send patches to ~yerinalexey/public-inbox@lists.sr.ht using
git send-email with prefix set to `csq`

:

```
$ git config format.subjectPrefix "PATCH csq"
```