An identity function, also called an identity relation or identity map or identity transformation, is a function that always returns the same value that was used as its argument.

Function Pointers provide an extremely interesting, efficient and elegant programming technique. You can use them to replace switch/if-statements, and to realize late-binding.

For each of the examples below, determine whether the mapping makes sense within the context of the given situation, and then state whether or not the mapping represents a function.

We have seen how functions defined by square roots have restrictions on their domains, and now we’ll look at rational functions. A rational function is simply a function defined by a fraction. …

Function: A rule for a relationship between an input, or independent, quantity and an output, or dependent, quantity in which each input value uniquely determines one output value.

Here are a few examples of functions. We will look at them in more detail during the lecture. Very important are polynomials, trigonometric functions, the exponential and logarithmic function. …

Problem 4: Return Values Problem: How does callee function send return value back to caller function? How does caller function access return value?