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Calculator input methods
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<p> There are various ways in which <a href="/facts/Calculator/eeLfRS8L">calculators</a> interpret keystrokes. These can be categorized into two main types: </p> <ul><li>On a single-step or immediate-execution calculator, the user presses a key for each operation, calculating all the intermediate results, before the final value is shown.</li> <li>On an expression or formula calculator, one types in an expression and then presses a key, such as "=" or "Enter", to evaluate the expression. There are various systems for typing in an expression, as described below.</li></ul>