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The simplest example given by Thimbleby of a possible problem when using an immediate-execution calculator is 4 × (−5). As a written formula the value of this is −20 because the minus sign is intended to indicate a negative number, rather than a subtraction, and this is the way that it would be interpreted by a formula calculator.
For example, both devices types were programmable in unstructured BASIC and with few exceptions featured QWERTY keyboards. However, there were also some differences: BASIC-programmable calculators often featured an additional "calculator-like" keyboard and a special calculator mode in which the system behaved like a scientific calculator.
hoc was developed by Brian Kernighan and Rob Pike as a glorified interactive calculator. Its basic functionality is to evaluate floating-point numerical expressions, e.g., 1 + 2 * sin (0.7). Then, variables were added, conditionals, loops, user-defined functions, simple IO, and more, using a syntax resembling C.
The following example uses the IFT function to pop an object from the bottom of the stack and, if it is equal to 1, replaces it with "One": « 1 == "One" IFT » The following example uses the IFTE function to pop an object from the bottom of the stack and, if it is equal to 1, replaces it with "One".
The Decimal class in the standard library module decimal has user definable precision and limited mathematical operations (exponentiation, square root, etc. but no trigonometric functions). The Fraction class in the module fractions implements rational numbers. More extensive arbitrary precision floating point arithmetic is available with the ...
The arrangement of digits on calculator and other numeric keypads with the 7-8-9 keys two rows above the 1-2-3 keys is derived from calculators and cash registers. It is notably different from the layout of telephone Touch-Tone keypads which have the 1-2-3 keys on top and 7-8-9 keys on the third row.
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A function definition starts with the name of the type of value that it returns or void to indicate that it does not return a value. This is followed by the function name, formal arguments in parentheses, and body lines in braces. In C++, a function declared in a class (as non-static) is called a member function or method.