Restarting the program

[fsdama]

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

#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;
}