Arrays in functions C++

This code seems to only work while the array (dArray[]) is initialized with a set of given numbers instead of user inputs. This code is supposed to calculate:
*the Minimum
*the Maximum
*average
*root mean squared
*standard deviation
but seems that the numbers are off. Any help would be much appreciated, thanks.

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  #include <iostream>
#include <cmath>

using namespace std;

double GetMax(const double dArray[], int iSize) {
    int iCurrMax = 0;
    for (int i = 1; i < iSize; ++i) {
        if (dArray[iCurrMax] > dArray[i]) {
            iCurrMax = i;
        }
    }
    return dArray[iCurrMax];
}

double GetMin(const double dArray[], int iSize) {
    int iCurrMin = 0;
    for (int i = 1; i < iSize; ++i) {
        if (dArray[iCurrMin] < dArray[i]) {
            iCurrMin = i;
        }
    }
    return dArray[iCurrMin];
}

double GetAverage(const double dArray[], int iSize) {
    double dSum = dArray[0];
    for (int i = 1; i < iSize; ++i) {
        dSum += dArray[i];
    }
    return dSum/iSize;
}

double GetRMS (const double dArray[], int iSize) {
    double dSum = dArray[0];
    for (int i = 1; i < iSize; ++i) {
        dSum += dArray[i];
    }
    return sqrt(dSum/iSize);

}

double GetST(const double dArray[], int iSize) {
    double mean= 0, sum_deviation=0;
    int i;
    for(i=0; i<iSize; ++i)
    {
        mean+=dArray[i];
    }
    mean = mean/iSize;
    for(i=0; i<iSize; ++i)
    sum_deviation +=(dArray[i]-mean)*(dArray[i]-mean);
    return sqrt(sum_deviation/iSize);
}



int main()
{
    double dValues[100];
    int iArraySize;
    int n, i;

    cout << "Enter a number " << endl;
    cin >> n;
    cout << "Enter " << n << " number(s) followed by enter" << endl;
    for (i=0; i<n; ++i){
        cin >> dValues[n];
        iArraySize = n;
    }

    cout << "Min = " << GetMax(dValues, iArraySize) << endl;
    cout << "Max = " << GetMin(dValues, iArraySize) << endl;
    cout << "Average = " << GetAverage(dValues, iArraySize) << endl;
    cout << "Root mean squared = " << GetRMS(dValues, iArraySize) << endl;
    cout << "Standard Deviation = " << GetST(dValues, iArraySize) << endl;

    return 0;
}

See line 68. Notice any problems?
Is it that I have to change n to a double?
No. But it is a problem with what's between the brackets.
Look closer, also look at the previous line, Think, what every varuable means and why is it in that particular place.
I figured it out, I had to change dValues[n] to dValues[i] and works now. Thanks for pointing out where the problem was. Simple mistakes.
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