Calculator Input Methods
There are various ways in which a calculator might interpret key strokes.
One can categorize calculators into two main types: 1) single-step or immediate execution calculators and 2) expression or formula calculators.
On a formula calculator one types in an expression and then presses 'Enter' to evaluate the expression. There are various systems for typing in an expression: infix, postfix, natural display etc.
On an immediate execution calculator, the user presses a key for each operation, by pressing keys to calculate all the intermediate results, before the final value is shown.
Read more about Calculator Input Methods: Immediate Execution, Reverse Polish Notation (RPN) (postfix Notation), Infix Notation, Tenkey Notation (adding Machine), Mathematical Display
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