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;
}

[Lindley]

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.

[hypheni]

Simple approach to repeat the same goes here..

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

[hypheni]

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.

[monarch_dodra]

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.