Restarting the program

I have a simple program showm below that asks the user for a choice of drink. But if they enter a value that is incorrect, how can you restart the program? Do I use a do...while?

Thanks

Code:

---

#include <iostream>

using namespace std;

int main()
{
        int choice;

        cout << " Please enter a choice of drink (1-3): \n";
        cin >> choice;

        switch (choice)
        {
        case 1:
                cout <<"Cola";
                break;

        case 2:
                cout <<"Orange";
                break;

        case 3:
                cout <<"Water";
                break;

        default:
                cout <<"Error. choice was not valid, here is your money back";
        }


system("Pause");
return 0;
}

---

Don't think of it as "restarting the program". Just use a loop to jump back to the thing you want to do repeat in order to fix the input.

Simple approach to repeat the same goes here..

Code:

---

char c;
do
{
 //your code which should repeat..
 cout<<"continue (y/n): ";
 cin>>c;
}while (c!='n');

---

And concept of restarting the whole program ie: the exe is complex but can be achieved. But for a simple console application I think I answered what you needed.

If you want to break out and restart your program from anywhere, then a try-catch construct might be better addapted than a plain while loop.

In any case, make sure your constructs are RAII (or make sure you correctly clean-up) to avoid memory leaks.

The usual alternative is to just exit the program, and have it restart from an external source. That's what 99% of command line apps do.