Menus:

A menu-driven program shows a list of actions, which it can execute on the screen. This type of program will allows the user to select any one of the actions that the user wants the program to execute at a time.

• The list of actions, which is displayed on the screen is referred as menu.
• This program will ask the user to enter the selection using keyboard, which displays a character such as a letter or a number that resides next to each menu options.

Validating user’s choice:

It is necessary to validate the user’s selection for the menu-driven programs. Hence the program must use a code to validate the choice using following methods:

• A user can include the "default" section in a case decision structure.
• A user can include an input validation loop in the program. This loop will immediately validate the input after the program reads the user’s menu selection.

Example:

Consider the following C++program, which uses a case decision structure for a menu driven program as follow as:

Program:

#include<iostream>

#include<string>

using namespace std;

int main()

{

//declare the required variables

int a = 5, b = 3;

char x;

//Menu list

cout << "A...