INVALID SLOT

I need to make an "INVALID SLOT" show up when a wrong input is entered in the single drop and multiple drop

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#include <iostream>
#include <string>
#include <cmath>
#include <ctime>
#include <iomanip>

using namespace std;

int main()
{
	int menu = 1;
	cout << "Welcome to Plinko!" << endl;
	while (menu != 3)
	{
		cout << endl;
		cout << "MENU: Please select one of the following options: \n 1 - Drop a single chip into one slot \n 2 - Drop multiple chips into one slot \n 3 - Quit the program \n";
		cout << "Enter your selection now: ";
		string option = "";
		cin >> option;
		int slotnumber = 0;
		int numberOfChips = 0;
		double location = slotnumber;
		double reward = 0;
		srand(time(0));
		const double PRIZE_0 = 100;
		const double PRIZE_1 = 500;
		const double PRIZE_2 = 1000;
		const double PRIZE_3 = 0;
		const double PRIZE_4 = 1000;
		const double PRIZE_5 = 0;
		const double PRIZE_6 = 1000;
		const double PRIZE_7 = 500;
		const double PRIZE_8 = 100;
		
		if (option != "1" && option != "2" && option != "3")
		{
			cout << "INVALID SELECTION. Please enter 1, 2 or 3";
			cout << endl;
		}


		if (option == "1")
		{
			cout << endl << endl;
			cout << "*** DROP SINGLE CHIP ***" << endl;
			cout << "Which slot do you want to drop the chip in (0-8)?: ";
			cin >> slotnumber;

			if (slotnumber >= 0 && slotnumber <= 8)
			{
				double location = slotnumber;
				cout << endl;
				cout << "*** DROPPING CHIP INTO SLOT " << slotnumber << " ***" << endl;
				cout << "Path: "<< "[" << location << " ";
				for (int i = 0; i < 12; i++)
				{
					double random = rand() % 2;
					if (random < 1)
					{
						location = location + 0.5;
					}
					else
					{
						location = location - 0.5;
					}
					if (location < 0)
					{
						location = 0.5;
					}
					else if (location > 8)
					{
						location = 7.5;
					}
					cout << location << " ";
					if (i < 12)
					{
						cout << location;
					}
				}

				if (location == 0) { reward = PRIZE_0; }
				else if (location == 1) { reward = PRIZE_1; }
				else if (location == 2) { reward = PRIZE_2; }
				else if (location == 3) { reward = PRIZE_3; }
				else if (location == 4) { reward = PRIZE_4; }
				else if (location == 5) { reward = PRIZE_5; }
				else if (location == 6) { reward = PRIZE_6; }
				else if (location == 7) { reward = PRIZE_7; }
				else if (location == 8) { reward = PRIZE_8; }
				cout << "]";
			}
			
				cout << endl;
				cout << fixed << setprecision(2) << "Winnings: $" << reward << endl;
				cout << endl << endl;
			

		}
		else if (option == "2")
		{
			cout << endl << endl;
			cout << "*** DROP MULTIPLE CHIPS ***" << endl;
			cout << "How many chips do you want to drop ( >0)? ";
			cin >> numberOfChips;
			if (numberOfChips > 0)
			{
				cout << "Which slot do you want to drop the chip in (0-8)? ";
				cin >> slotnumber;

				if (slotnumber >= 0 && slotnumber <= 8)
				{
					double location = slotnumber;
					double totalWinnings = 0;

					for (int i = 0; i < 12; i++)
					{
						totalWinnings = totalWinnings + reward;

						for (int i = 0; i < 12; i++)
						{
							double random = rand() % 2;
							if (random < 1)
							{
								location = location + 0.5;
							}
							else
							{
								location = location - 0.5;
							}
							if (location < 0)
							{
								location = 0.5;
							}
							else if (location > 8)
							{
								location = 7.5;
							}
						}


						if (location == 0){ reward = 100; }
						else if (location == 1){ reward = 500; }
						else if (location == 2){ reward = 1000; }
						else if (location == 3){ reward = 0; }
						else if (location == 4){ reward = 1000; }
						else if (location == 5){ reward = 0; }
						else if (location == 6){ reward = 1000; }
						else if (location == 7){ reward = 500; }
						else if (location == 8){ reward = 100; }

						location = slotnumber;
					}
					double average = totalWinnings / numberOfChips;
					cout << fixed << setprecision(2) << "Total winnings on " << numberOfChips << " chips: $" << totalWinnings << endl;
					cout << fixed << setprecision(2) << "Average winnings per chip: $" << average << endl;
				}
			}
		}
		else if (option == "3")
		{
			cout << "GOODBYE!" << endl;
			system("pause");
			return 0;
		}
	}
	system("pause");
	return 0;
}
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