[Solution] programming final

Create a project and name the source file final followed by your initials
Write a program that does the following functions
void displayMenu()to print the menu 
 1 to add two items
2 to subtract two numbers
3 to multiple two numbers
4 to divide two numbers
5 to get average of 5 numbers
6 to format a phone number
X to exit 
 Gets a menu selection that does the following
Char getSelection(); 
 Uses a do while loop and switch to get and validate the selection
Prints and error message is user inputs a wrong selection
Make sure to use toupper() 
 Use switch
 Int getPosNumber(); 
 Used to get a positive number
The number should be input using getline string and coverted to an integer  
 using stoi 
 Use getPosNumber()to get all number 
 int sum();
int difference();
int product(); 
 double quotient();
double average(); 
 string getPhoneNumber()
gets a 10 digit phonenumber using getline 
 string formatPhone()
formats the 10 digit string to (xxx)-xxx-xxx 
 use string insert to format

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