Describe as many ways as you can in which functions in imperative programming languages differ from functions in mathematics. Consider the following code in C++:           Suppose that...

Describe as many ways as you can in which functions in imperative programming languages differ from functions in mathematics. Consider the following code in C++:

Suppose that string_map::operator[] contains the only call to complex_ lookup anywhere in the program. Explain why it would be unwise for the programmer to expand that call textually in-line and eliminate the separate function.