Ndzri : Switch in switch c++ example

	#include <iostream>
	using namespace std;
	int i=0;
	void input()
	{
	cin >> i;
	if (cin.fail())
	{
	cin.clear();
	cin.ignore(10000,'\n');
	i=10;
	}
	}

	int main()
	{
	do
	{
	cout << "This is the main menu. Select 1 or 2 to go to sub menu 1 or 2, 0 to exit : ";
	input();
	switch (i)
	{
	case 0: cout << "Bye bye\n";
	break;
	case 1: cout << "\nYou are now in sub menu 1. \nSelect 1 or 2 in this sub menu 1, -1 to exit to main menu back\n";
	do
	{
	input();
	switch (i)
	{
	case -1: cout << "User exit sub menu 1 \n\n";
	break;
	case 1: cout << "User selected one in sub menu 1\n";
	break;
	case 2: cout << "User selected two in sub menu 1\n";
	break;
	default: cout << "User does not select 1 or 2, or maybe the user key in some letter\n";
	}
	}
	while(i!=-1);
	break;
	case 2: cout << "\nYou are now in sub menu 2. \nSelect 1 or 2 in this sub menu 2, -1 to exit to main menu back\n";
	do
	{
	input();
	switch (i)
	{
	case -1: cout << "User exit sub menu 2 \n\n";
	break;
	case 1: cout << "User selected one in sub menu 2\n";
	break;
	case 2: cout << "User selected two in sub menu 2\n";
	break;
	default: cout << "User does not select 1 or 2, or maybe the user key in some letter\n";
	}
	}
	while(i!=-1);
	break;
	default: cout << "User does not select 1 or 2, or maybe the user key in some letter\n";

	}
	}
	while (i!=0);

	}

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