初学者数组的问题，C++

赋值需要三个函数。用户输入数字 0-9，直到输入 10，这将停止输入，并计算每个数字，然后输出每个数字中有多少个已计数。仅当用户为其输入数字时，它才应输出。

我唯一的问题是，对于数组中用户不使用的每个元素，Xcode 都会将其计为 0，因此最终输出具有异常大量的零。其他一切正常。

这是我的代码

#include <iostream>
using namespace std;
// counter function prototype
void count(int[], int, int []);
// print function prototype
void print(int []);
int main()
{
    // define variables and initialize arrays
    const int SIZE=100;
    int numbers[SIZE], counter[10], input;
    // for loop to set all counter elements to 0
    for (int assign = 0; assign < 10; assign++)
    {
        counter[assign]=0;
    }
    // for loop to collect data
    for (int index=0 ; input != 10 ; index++)
    {
        cout << "Enter a number 0-9, or 10 to terminate: ";
        cin >> input;
        // while loop to ensure input is 0-10
        while (input < 0 || input > 10)
        {
            cout << "Invalid, please enter 0-9 or 10 to terminate: ";
            cin >> input;
        }
        // if statements to sort input
        if (input >= 0 && input <=9)
        {
            numbers[index] = input;
        }
    }
    // call count function
    count(numbers, SIZE, counter);
    // call print function
    print(counter);
    return 0;
}
// counter function
void count(int numbers[], int SIZE, int counter[])
{
    // for loop of counter
    for (int index = 0 ; index < 10 ; index++)
    {
        // for loop of numbers
        for (int tracker=0 ; tracker < SIZE ; tracker++)
        {
            // if statement to count each number
            if (index == numbers[tracker])
            {
                counter[index]++;
            }
        }
    }
    return;
}
// print function
void print(int counter[])
{
    // for loop to print each element
    for (int index=0 ; index < 10 ; index++)
    {
        // if statement to only print numbers that were entered
        if (counter[index] > 0)
        {
            cout << "You entered " << counter[index] << ", " << index << "(s)" << endl;
        }
    }
    return;
}