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The modulo operation is equivalent to dividing an integer by another integer, and returning the remainder. Many programming languages use % as an operator to denote modulo.

e.g. 10 % 3 = 1 or in RPN terms, 3 10 % = 1

The string 2 1 - should be "parsed" as the infix expression 1 - 2. The test instead writes 2 1 - = 1, as if it were being read 2 - 1.

ie stack underflow

TODO

TODO: Worksheet (questions and answers), or reference?

The calculator currently parses floats and uses float operations (e.g. / is float division, where 3 / 2 = 1.5). We could provide an option to work in "integer mode", parsing integers and using integer operations (e.g. // for floor division, where 3 // 2 = 1).

META: Would give us a merge conflict if we branch from talk start, and try to merge near talk end.

• Add constants: e, pi
• Add unary operators: loge

TODO

The string parser only permits a single space between each element e.g. 1 2 +. Entering 1 2 + will fail. Double spaces at least would be sensible to permit, in case the user prefers that formatting.