Splitting a bill

Package: FINANCE_PACKAGE. Registered by createEngine(); for a slimmer engine, register it explicitly (see choosing packages).

Splitting a bill is the most common money note there is: an amount divided by the number of people paying it. split <amount> between <N>, or <amount> split <N> ways, answers it in place.

split $120 between 3 // $40.00 each
$120 split 3 ways // $40.00 each
split $100 between 4 people // $25.00 each

The amount stays exact, so a tip written as a percentage composes with the split on one line: $120 + 18% is $141.60, and split three ways that is $47.20 each. A bare number splits to a bare number, so no currency is invented where none was written.

$120 + 18% split 3 ways // $47.20 each
10 split 3 ways // 3.33 each

The boundary is the odd penny. split $100 between 3 is not a bare $33.33 each that quietly loses a penny: the extra penny is named, and the shares add back to the total to the cent.

split $100 between 3 // $33.33 each, with 1 share paying $33.34

split, ways and people are ordinary words everywhere else. They are read as the split grammar only inside the full shape, so a variable named split, or :split = 5, is untouched. The count must be a whole number of at least one, and a literal: a parenthesised or worded count leaves split an ordinary word.