Almost done with my program. One problem. Please help!!

[Jake Jung]

I am doing this plinko lab. If you don't know what plinko is, here is the picture : http://www.hoytcompany.com/images/games/plinko.jpg

Multiple chips are inserted into one slot and each ship is supposed to randomly fall onto random winning amount. I did best I could to apply randomness into this but for some reason, each time I run multiple chip function, i always get same winning amount. Here is the big chunk of my code:

//If the user has chosen option "1":

void drop_multiple()
{
	double total_amount = 0;
	int number_of_chips = 0;
	int starting_slot = -1;
	int current_position = -1;
	const int TOTAL_LEVELS = 13;
	int shift = rand() % 2;
	srand(time(0));

	cout << "How many chips?: ";
	cin >> number_of_chips;
	cout << endl;
	
	if(number_of_chips < 0)
		cout << number_of_chips << " is an invalid entry." << endl;
	else
	{
		cout << "Enter slot number: ";
		cin >> starting_slot;
		if(starting_slot < 0 || starting_slot > 8)
			cout << "Invalid Entry." << endl;
		else
		{
			for(int i = 0; i < number_of_chips; i++) //loop for every chip dropped in starting_slot
			{
				current_position = starting_slot; //resets bounce back and forth for each chip
				for(int j = 0; j < TOTAL_LEVELS; j++)
				{
					shift = rand() % 2;
					
					// Moves token right or left
					if(shift == 0)
						current_position = current_position - 0.5;
					else if(shift == 1)
						current_position = current_position + 0.5;
						
					// Checks bounds
					if(current_position <= 0)
						current_position = 0.5;
					else if(current_position >= 8)
						current_position = 7.5;
				} // end inner for loop
				total_amount = total_amount + calc_amount(current_position); // totals and adds earnings for where the chip lands according to the calc_amount function
			} // end outer for loop
		} // end inner else
	} // end outer else
	
	if(total_amount <= 0)
	{
		cout << "\nSorry, you didn't earn any money! Please try again." << endl;
	}
	else 
	{
		cout << "\nThe average of winning amount is: $"<< total_amount / double(number_of_chips) << endl; //notice that this is integer division
		cout << "Congrats! You have earned total: $" << total_amount << endl;
	}
} // end function 

Please help me figure out what the problem is... Thanks.

[coder777]

remove line 11 and put it at the beginning of the main() function. It's not good to seed the random function more then once