Room Game Code v001

#include <iostream>
#include <cmath>
#include <string>
#include <stdlib.h>

using namespace std;

string command, target;
bool key_have, door_open, key_know;
int dirt_in_pocket;

void inspect()
{
	switch(target)
	{
		case 'door':

		case 'room':

		case 'floor':

		case 'walls':

		case 'ceiling':

		case 'key':

		case 'computer':

		default:
		system("CLS");
		cout << "Invalid input.\n\n";
		END = '';
	}
}

void take()
{
		switch(target)
	{
		case 'door':

		case 'room':

		case 'floor':

		case 'walls':

		case 'ceiling':

		case 'key':

		case 'computer':

		default:
		system("CLS");
		cout << "Invalid input.\n\n";
		END = '';
	}
}

void use()
{
		switch(target)
	{
		case 'door':

		case 'room':

		case 'floor':

		case 'walls':

		case 'ceiling':

		case 'key':

		case 'computer':

		default:
		system("CLS");
		cout << "Invalid input.\n\n";
		END = '';
	}
}

void help()
{
		switch(target)
	{
		case 'inspect':
			cout << "You can use this to look around.\n\n";
			break;
		case 'take':
			cout << "This lets you take things.\n\n";
			break;
		case 'use':
			cout << "Allows you to use something in your posession.\n\n";
			break;
		case 'reset':
			cout << "This will reset all variables and let you start over.\n\n";
			break;
		case 'end':
			cout << "The game ends and then closes.\n\n";
			break;
		case 'help':
			cout << "Do you really need to know what this does...\n\n";
			break;
		case '':
			cout << "Type '/help <target>' to find out more about it:";
			cout << "1. inspect\n2. take\n3. use\n4. reset\n5. end\n6. help\n7. ' '\n\n";
			break;
		default:
			system("CLS");
			cout << "Invalid input.\n\n";
			END = '';
	}
}

void reset()
{
	char RESET;

	while(RESET == '')
	{
		system("CLS");
		cout << "Are you sure you want to reset everything? [Y or N]\n\n";
		cin << RESET;

		if(RESET == 'y' || RESET == 'Y')
		{
			system("CLS");
			key_have = false;
			door_open = false;
			key_know = false;
			dirt_in_pocket = 0;
			cout << "All variables have been reset. Enter a new command.\n\n";
		}
		else if(RESET == 'n' || RESET == 'N')
		{
			system("CLS");
		}
		else
		{
			system("CLS");
			cout << "Invalid input.\n\n";
			RESET = '';
		}
	}
}

void end()
{
	char END;

	while(END == '')
	{
		system("CLS");
		cout << "Are you sure you want to exit? [Y or N]\n\n";
		cin << END;

		if(END == 'y' || END == 'Y')
		{
			system("CLS");
			cout << "Thank you for playing, have a nice day!";
			system('pause');
			return 0;
		}
		else if)(END == 'n' || END == 'N')
		{
			system("CLS");
		}
		else
		{
			system("CLS");
			cout << "Invalid input.\n\n";
			END = '';
		}
	}
}