Aside Constants associated with Unix functions

What are exactly functions in python Why functions are needed in a program? advantages? Functions limitations? is there any case where functions can't be used

What is the method for storing local declarations in computer memory? Is there any reason to avoid using local declarations if the same objective can be achieved without them? Why use value parameters if reference parameters can be used in any function? What role do value parameters play in program data processing?

Which of the following are  advantages of inline function declarations in C++ or the "Pragma Priority (x)" in Ada?     they do not save push/pop variable overhead on the stack when it is called     there is a lookup time required at runtime which is the same as an external function call during compile time