Switch menu calculator will not display arithmetic - c++

Question

Sorry if the title is confusing, I did not know how to word my issue very well.
I understand some of my program is not finished as of right now, I'm currently only working on the keyboard input sections.
Basically, I have to create a program that allows the user to either input a file with set integers or have the user enter two integers of their own. This user is also asked which arithmetic they would like performed on their integers. I created a menu and sub menus using a switch statement that would allow the user to easily navigate to their destination.
My problem is, when I try to use the input through keyboard option, my program fails to display the calculated variable. I can fully navigate to the option and even input my integers but when the program displays the final answer it states: "The total is: menu" and then it kicks me back to the main menu.
My specific example:
User selects (2) for keyboard input.
User selects (1) for addition arithmetic
User enters an integer (1)
User enters another integer (2)
Program displays "The total is: Menu"
Program loops back to main menu.
Here is my code:
#include "complx.h"
#include <iostream> using namespace std;
ifstream infile ("in.dat");
int main() {
int choiceOne, choiceOneSubMenu, choiceTwoSubMenu, digitOne, digitTwo, digitTotal;
bool menu = true;
do{
cout << "Menu \n";
cout << "=========== \n";
cout << "(1) Input from a file \n";
cout << "(2) Input from the keyboard \n";
cout << "(3) Exit the program \n";
cout << "Enter a numerical selection: \n";
cin >> choiceOne;
switch (choiceOne) {
case 1:
cout << "You chose input from a file \n";
cout << "=============== \n";
cout << "Which arithmetic would you like applied? \n";
cout << "(1) Addition + \n";
cout << "(2) Subtraction - \n";
cout << "(3) Multiplication * \n";
cout << "(4) Division / \n";
cout << "Enter a numerical selection: \n";
cin >> choiceOneSubMenu;
switch (choiceOneSubMenu) {
case 1:
break;
case 2:
break;
case 3:
break;
case 4:
break;
}
break;
case 2:
cout << "You chose input from the keyboard \n";
cout << "=============== \n";
cout << "Which arithmetic would you like applied? \n";
cout << "(1) Addition + \n";
cout << "(2) Subtraction - \n";
cout << "(3) Multiplication * \n";
cout << "(4) Division / \n";
cout << "Enter a numerical selection: \n";
cin >> choiceTwoSubMenu;
switch (choiceTwoSubMenu)
{
case 1:
cout << "You chose addition \n";
cout << "=============== \n";
cout << "Enter your first integer: \n";
cin >> digitOne;
cout << "Enter your second integer: \n";
cin >> digitTwo;
digitTotal = (digitOne + digitTwo);
cout << "The total is: " + digitTotal;
break;
case 2:
cout << "You chose subtraction \n";
cout << "=============== \n";
cout << "Enter your first integer: \n";
cin >> digitOne;
cout << "Enter your second integer: \n";
cin >> digitTwo;
digitTotal = (digitOne - digitTwo);
cout << "The total is: " + digitTotal;
break;
case 3:
cout << "You chose multiplication \n";
cout << "=============== \n";
cout << "Enter your first integer: \n";
cin >> digitOne;
cout << "Enter your second integer: \n";
cin >> digitTwo;
digitTotal = (digitOne * digitTwo);
cout << "The total is: " + digitTotal;
break;
case 4:
cout << "You chose division \n";
cout << "=============== \n";
cout << "Enter your first integer: \n";
cin >> digitOne;
cout << "Enter your second integer: \n";
cin >> digitTwo;
digitTotal = (digitOne / digitTwo);
cout << "The total is: " + digitTotal;
break;
}
break;
case 3:
cout << "You have chosen to exit";
}
}while(choiceOne!=3);
}

Answer 1

cout << "The total is: " + digitTotal;
you can't simply convert digit to string and concatenate it using + operator.
Edit:
you can do it like this:
cout << "The total is: " << itoa(digitTotal);
or these