[Solved] In c++, why is cout is so important?

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Method 2:
Just change the position of: int num[n];

#include
using namespace std;

int main(int argc, const char * argv[])
{

    // method 1:

    int n;
    cout << "Enter a set of integers: "<< endl;
    cin >> n;
    int num[n];
    for (int i = 0; i < n; i++)
    {
        cin >> num[i];
    }
    cout << "num of arrays: "<< endl;
    for (int i = 0; i < n; i++)
    {
        cout << num[i] << " ";
    }
    cout << endl;

    for(int i = 0; i < n; i++)
    {
        int reminder = 0;
        int numOfOnes = 0;
        if(num[i] <= 0)
        {
            numOfOnes = 0;
        }
        else
        {
            while (num[i] > 0)
            {
                reminder = num[i] % 2;
                num[i] = num[i] / 2;
                //cout <<" Reminder = "<< reminder<<endl;

                if( reminder == 1)
                {
                    numOfOnes++;
                }
            }
        }
        cout <<"Number of ones= "<< numOfOnes << endl;
    }
}

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solved In c++, why is cout is so important?