Need help finding mode in C++

[CrumbledCookies]

Okay, so I'm a 7 month experienced programmer in C++, and now is the time when I am having the most trouble. So my Professor wants us to create a program that asks the user to input a sequence of numbers and then convert those numbers into outputs of "how many positive, negative, and zero entries; what number was entered most frequently and how many times it was entered; and how many total numbers were entered; and use 9999 to stop inputting numbers." I cannot use an array to do this and I'm having trouble finding the mode without an array. Here's my algorithm so far:

Inputs:
number

Outputs: 
total numbers
sum
positive
negative
zero
most number
times entered

1. INPUT number
2. REPEAT when number is not 9999
3.     sum = sum + number
4.     total numbers = total numbers + 1
5.     IF number is greater than 0
            positive = positive + 1
6.     END-IF
7.     IF number is less than 0
            negative = negative + 1
8.     END-IF
9. IF number is equal to 0
zero = zero + 1
10. END-IF

And that's it for my pseudocode, I've tried as many things as I could think of to do as such as asking the user how many variables they would like to enter and so forth. Please help me. Thank you in advance!

[Clinton Portis]

your professor prohibitied the use of arrays, but there are many other data structures you could consider, such as string, vector, linked-list, queue, deque, and list. (cstring could be considered use of an array)

[CrumbledCookies]

Problem is, we have never covered any of those structures :/ she said we could use a function, but I'm not sure how I would set it up.

[spoonlicker]

I think if you actually tested the code rather than an algorithm for it and showed it here I would've understood it a little bit more(the source code you'd be using).

But no offense.....

[ravenous]

Yeah, I agree with the above. Post some C++ code and you might get more help.

Also, as Clinton Portis said, you should clarify the "don't use arrays" clause with your professor. Does this mean just C-style arrays, or all array-like structures (i.e. std::vector , std::map , etc)? If you can't use any array-like structure, then this becomes very hard, so I shouldn't think that this is the case. Get clarification :)

Finally, I made a code snippet about finding the mode of some list of integers here. Hope that helps.