Some help for a newbie!!!

I am new to this site and new to the C++ language, so pls bare with me. I am sure there is a very simple solution to this problem but it has got me stumped!!! I had to create a Counter class that has four counters. Think of it like this: [][][][]...it's not an array, each one is a separate variable that keeps a running total that is controlled by it's own function. Each one separately represents ones, tens, hundreds, and thousands(from right to left obviously) so when they reach 10 the 1 is carried over to the next one. Now, I have everything working except for the carry over.

Code:

#include <iostream.h>

class Counter
{
	private:
				int total1, total2, total3, total4, grandTotal;
				int max;
				int price1, price2, price3, price4;
	public:
				Counter();
				void reset() { total1=0, total2=0, total3=0, total4=0, grandTotal; }
				void incrl1();
				void incrl10();
				void incrl100();
				void incrl1000();
				void overflow() { cout << "You have exceeded your limit!"; }
				void display();
};

Counter::Counter()
{
	max=9999, total1=0, total2=0, total3=0, total4=0, grandTotal=0;
	price1=0, price2=0, price3=0, price4=0;
}

void Counter::incrl1()
{
	cout << "Enter num: ";
	cin >> price1;
	grandTotal += price1;
	if(grandTotal>max)
		overflow();
	total1 += price1;
	if(total1>9)
	{
		total1=total1-10;
		total2++;
	}
}

void Counter::incrl10()
{
	cout << "Enter num: ";
	cin >> price2;
	grandTotal += price2*10;
	if(grandTotal>max)
		overflow();
	total2 += price2;
	if(total2>9)
	{
		total2=total2-10;
		total3++;
	}
}

I have obviously left out the other functions, but this should give you an idea.
as you can see if the total becomes>9 I am incrementing the next total, but this only works when it is less than 9 because otherwise it becomes 10 and that's not what I want and I can't figure out how else to do it. The only thing I can think of to solve the problem would be to call a function that has a long rediculous nested 'if' statement, but I feel there has to be another way!! Any suggestions would be much appreciated...thnks

thnks alot for your help Salem...I figured I needed to pass it out somehow but I just couldn't figure where to pass it to! Thnks for clearing it up for me