#include <iostream>
#include <cmath>
using namespace std;

double std_Dev (double Nums[], int inSize, double &avg, double &sum, double &sum2);

int main ( ){
    int inSize;
    double avg = 0, sDev, sum = 0, sum2 = 0;
    cout << "How many Numbers would you like to find the standard deviation for (max 100):";
    cin >> inSize;

    double Nums[inSize];

    cout << "\nInput the numbers hit enter after each entry:";
    for ( int i = 0; i < inSize; i++ ){
        cin >> Nums[i];
    }

    sDev = std_Dev(Nums, inSize, avg, sum, sum2);

    cout << sum<<" "<<inSize<<" "<<avg<<" "<<sDev<<endl;

    return 0;
}

double std_Dev (double Nums[], int inSize, double &avg, double &sum, double &sum2){
    for ( int i = 0; i < inSize; i++ ){
        sum += Nums[i];
    }
    avg = sum / inSize;

    for ( int i = 0; i < inSize; i++ ){
        sum2 += pow( Nums[i] - avg, 2 );
    }

    double sDev;
    sDev = sqrt( sum2 / ( inSize - 1 ) );

    return sDev;
}

double* Nums=new double[inSize];