Labels - MARIE-js/MARIE.js GitHub Wiki

Labels allow you to reference memory cells. They consist of an alphabet followed by a sequence of zero to many alphanumerical characters. For example, One is a valid name for a label, whereas 6loop is not a valid label. Labels are case-sensitive, so One and ONE are different labels.

There are three purposes for labels:

1. Refer to a single value. For example, One, DEC 1 and ADD One
2. Refer to instructions to jump to. For example Loop, Load X and Jump Loop
3. Refer to an array of values. This can be done by using ADR <label>. For example, StartOfArray, DEC 42 stores the first element of an array, and ArrayPointer, ADR StartOfArray allows you to store memory address of label StartOfArray in ArrayPointer.