Вычислить среднее значение среди нечетных элементов последовательности

#include <iostream>
#include <vector>
 
int average_of_odd(const std::vector<int>& in)
{
    int nodds = 0;
    for (int i = 0; i < in.size(); ++i)
        if (in[i] % 2 != 0) nodds += in[i];
 
        return nodds / in.size();
}
 
int max_of_multiple_of_three(const std::vector<int>& in)
{
    int mult = 0;
    int max = 0;
    for (int i = 0; i < in.size(); ++i)
        if (in[i] > max && in[i] % 3 == 0) max = in[i];
 
    return max;
}
 
void exchange(std::vector<int>& in, int change)
{
    for (int i = 0; i < in.size(); i += 2)
        in[i] = change;
}
 
int main()
{
    std::vector<int> array;
    int temp;
    std::cout << "Please, enter elements of array(press q to stops) :";
    while (std::cin >> temp)
        array.push_back(temp);
 
    int average = average_of_odd(array);
    std::cout << "\nAverage of odd numbers : " << average;
    std::cout << "\nMaximum of multiple of three : " << max_of_multiple_of_three(array);
    exchange(array, average);
    std::cout << "\nArray after exchange : ";
    for (int i = 0; i < array.size(); ++i)
        std::cout << array[i] << " ";
 
    system("pause>nul");
}