Switch statement problems

When the code below is compiled and I choose 1 which is add and when my add function is finished my subtract function starts running even though I don't want it to, help me pleas.

Code:

#include <iostream>

int MenuAndMenuChoice();
double Add();
double Subtract();

int main()
{
    
    //Function - MenuAndMenuChoice is called to print the menu and get the user's choice
    switch (MenuAndMenuChoice())
    {
          
          //A descision is then made hear depending on what the user entered
          case 1: std::cout << "\nThe two numbers added together equal: " << Add();
          
          case 2: std::cout << "\nThe second number subtracted from the first number equals: " << Subtract();
          
    }
    
    std::cin.get();
    return 0;
}

//Function MenuAndMenuChoice code starts here
int MenuAndMenuChoice()
{
    
    int MenuChoice;
    
    std::cout << "1.Add\n";
    std::cout << "2.Subtract\n";
    std::cout << "3.Multiply\n";
    std::cout << "4.Divide\n";
    std::cout << "5.Circle Area\n";
    std::cout << "6.Circle Circumference\n";
    std::cout << "7.Exit\n\n";

    std::cout << "What would you like to do? ";
    std::cin >> MenuChoice;
    
    return MenuChoice;
    
}

//Function Add code starts here
double Add()
{    
     
    double FirstNumber, SecondNumber, AddAnswer;
     
    std::cout << "\nWhat is the first number: ";
    std::cin >> FirstNumber;
    std::cin.ignore(80,'\n');
    
    std::cout << "What is the second number: ";
    std::cin >> SecondNumber;
    std::cin.ignore(80,'\n');
    
    AddAnswer = FirstNumber + SecondNumber;
    
    return AddAnswer;
    
}

//Function Subtract code starts here     
double Subtract()
{
    
    double FirstNumber, SecondNumber, SubtractAnswer;
    
    std::cout << "\nWhat is the first number: ";
    std::cin >> FirstNumber;
    std::cin.ignore(80,'\n');
    
    std::cout << "What number would you like to take away from the first number: ";
    std::cin >> SecondNumber;
    std::cin.ignore(80,'\n');
    
    SubtractAnswer = FirstNumber - SecondNumber;
    
    return SubtractAnswer;
    
}

Common mistake. After each set of statements after a case add a "break;". It will skip to the end of the switch block.

switch statements are defined to have fall-through behavior. You need a break statement if you don't want it to go to the next one.

Code:

    switch (MenuAndMenuChoice())
    {
          //A descision is then made hear depending on what the user entered
          case 1:
             std::cout << "\nThe two numbers added together equal: " << Add();
             break;
          
          case 2:
             std::cout << "\nThe second number subtracted from the first number equals: " << Subtract();
             break;
    }

Thanks, I'm back on track but another question. How do I get my program to quit when 7 is entered.

look up exit(); I think it's in cstdio

If you're in main, the simpler solution is to simply return 0. Once you return a value the function stop executing and control returns to the parent function, or, in this case, the Operating System.