Need help with plinko

[vfisher05]

I'm supposed to make a plinko simulator for my class. I've been working on it, but for some reason the random number generator doesn't seem to work. When I run the program it prints 7.5 12 times and doesnt move the plinko chip at all. Also, my menu wont quit when I press C like it should, it just prints that it is an invalid entry. Please help me! Thank you.

#include "stdafx.h"
#include <iostream>
#include <string>
#include <ctime>
#include <cstdlib>

using namespace std;

//VARIABLES
string menu_input;
int slot;
double slot_position;
int random;

const double slot0 = 0;
const double slot1 = 1;
const double slot2 = 2;
const double slot3 = 3;
const double slot4 = 4;
const double slot5 = 5;
const double slot6 = 6;
const double slot7 = 7;
const double slot8 = 8;

const double money1 = 100;
const double money2 = 500;
const double money3 = 1000;
const double money4 = 0;
const double money5 = 10000;





// PART 1- THE MENU
void menu() {
	cout << "\t\t\tPLINKO SIMULATOR" << endl;
	cout << "\tPlease select one of the following options: \n" << endl;
	cout << "Drop one chip into one slot \t\t\t (Enter A)" << endl;
	cout << "Drop multiple chips into one slot \t\t (Enter B)" << endl;
	cout << "Quit \t\t\t\t\t\t (Enter C)\n" << endl;
	cin >> menu_input;
}

void positionfinder() {
	for (int i = 1; i < 13; i++) {
		if (slot_position > 0 && slot_position < 8) {
			random = rand() % 2;
			if (random = 0) {
				slot_position = slot_position + .5;
			}
			if (random = 1) {
				slot_position = slot_position - .5;
			}
		}
		if (slot_position = 0) {
			slot_position = slot_position + .5;
		}
		else if (slot_position = 8) {
			slot_position = slot_position - .5;
		}
		cout << slot_position << endl;
	}
	cout << "The final position is: " << slot_position << endl;
	
	if (slot_position == slot0 || slot_position == slot8) {
		cout << "You win $" << money1 << endl;
	}
	if (slot_position == slot1 || slot_position == slot7) {
		cout << "You win $" << money2 << endl;
	}
	if (slot_position == slot2 || slot_position == slot6) {
		cout << "You win $" << money3 << endl;
	}
	if (slot_position == slot3 || slot_position == slot5) {
		cout << "You win $" << money4 << endl;
	}
	if (slot_position == slot4) {
		cout << "You win $" << money5 << endl;
	}
	cout << "\nReturning to menu...\n" << endl;
	//positionfinder is not working. It still spits out '7.5' 12 times for everything. The money thing doesnt even work because 7.5 isnt supposed to be one of the final values
}

int main() {
	srand(time(0));	

	//PART 2- LET THE CHIPS FALL
	while (menu_input != "C" || menu_input != "c") {
		menu();		
		// it registers c as invalid
		//when it registers something as invalid, when I try to type anything it  no longer registers anything as valid
		if (menu_input == "A" || menu_input == "a") {
			cout << "\n\nWhich slot would you like to drop your chip?" << endl;
			cout << "(Select an integer from 0-8)" << endl;
			cin >> slot;			
			if (slot == 0) {
				slot_position = slot0;
				positionfinder();				
			}
			else if (slot == 1) {
				slot_position = slot1;
				positionfinder();
			}
			else if (slot == 2) {
				slot_position = slot2;
				positionfinder();
			}
			else if (slot == 3) {
				slot_position = slot3;
				positionfinder();
			}
			else if (slot == 4) {
				slot_position = slot4;
				positionfinder();
			}
			else if (slot == 5) {
				slot_position = slot5;
				positionfinder();
			}
			else if (slot == 6) {
				slot_position = slot6;
				positionfinder();
			}
			else if (slot == 7) {
				slot_position = slot7;
				positionfinder();
			}
			else if (slot == 8) {
				slot_position = slot8;
				positionfinder();
			}
			else if (slot < 0 || slot > 8) {
				cout << "\n\nInvalid Entry.\n" << endl;
				cout << "Returning to menu...\n" << endl;
			}				
		}		
		//still need to put option b in here
		else if (menu_input != "A" || menu_input != "a" || menu_input != "B" || menu_input != "b" || menu_input != "C" || menu_input != "c") {
			cout << "\n\nInvalid Entry." << endl;
			cout << "\nReturning to menu...\n" << endl;
			//it always registers c and b as invalid
		}
	}	
	if (menu_input == "C" || menu_input == "c") {
		cout << "Good Bye!" << endl;
		//DOES NOT WORK
	}
	system("pause");
	return 0;
}

[cire]

Lines 49, 52, 56 and 59 all use assignment in an if condition. Is that really what you intend?