Is it possible to explain the importance of function creation in programming?

Describe a situation when a history-sensitive variable in a subprogram isuseful   Consider the following JavaScript program:var x, y, z;function sub1() { var a, y, z; function sub2() { var a, b, z; . . . } . . .}function sub3() { var a, x, w; . . .}Please list all the variables, along with the program units where they are declared, that are visiblein the bodies of sub1, sub2, and sub3, assuming static scoping is used.

C++ Programming

C++ must be 300 words  Explain functions and how to pass values using by reference and by value. Use examples (code examples) to explain the concept.

Suppose that you are a manager of a programming team. To facilitate project development and maintenance, you have decided to establish some programming and coding guidelines. Make a list of pointer-related programming guidelines you think will improve program readability and decrease pointer-related bugs.

Explain clearly and state TWO reasons why it is a good idea to write user-defined functions when developing programs in Python?

I am learning c++, and I get confused. I meet three questions, and one is asking to write a function header for a function named distance; the second question is to write the prototype for a function named distance, and the third question is to write a function call for a function named distance. I am wondering how to write different functions for these three questions? What are the differences between them? I am so confused.

Why are functions even necessary in the first place in the world of programming?

Reviewing this program address the following points: Design/Implementation: Are there noticeable issues/flaws in the design and implementation of the code? How would you remedy such issues? Readability: Is the code well organized and easy to follow? Can you understand what is going on, easily? Documentation: Is the documentation well-written? does it explain what the code is accomplishing and how? Remember good documentation includes descriptive variable and function names in addition to clear/concise annotation. Efficiency: Was the code efficient, without sacrificing readability and understanding? #include <iostream> using namespace std; int main() {    double meal, tax, tip, total; //create variables    double taxPercentage = .0675, tipPercentage = .2; //initiate percentage values        cout << "Enter a meal charge: \n";    cin >> meal; //enter meal        tax = meal * taxPercentage;    tip = (meal + tax) * tipPercentage;    total = meal+tax+tip;         cout…

Could you comment on the significance of the act of programming functions?