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In contrast, procedure-oriented programming languages, such as C, encourage you to think in terms of functions and procedures, instead of in terms of classes and class hierarchies. Strictly speaking, functions are procedures that lack side effects. Nevertheless, function and procedure are used interchangeably.
Thus, to compute the square root of 2 using a procedure-oriented
programming language, you must identify the appropriate function,
which, when applied to 2—a datum of the integer data
type—answers 1.41421, the function's value. Visually, the
function has center stage; 2 is just the function's argument:
Data-type specific function
|
Argument | Value answered
| v |
*-* *---------------------* |
v | | v
2 -------> | integer-square-root |-------> 1.41421
| |
*---------------------*