Program to find average and standard deviation of n numbers

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#include <iostream.h>
#include <math.h>
//Program to find average and standard deviation of n numbers
int main()
{
int n , j ,y;
double sum=0 , variance;
cout << "\nHow many numbers to type? " << endl;
cin >> y;
double max[y];
for(n=0;n<=y-1;n++)
{
cout << "Type next number: ";
cin >> max[n];
}
n=0;
cout << endl;
cout << "Numbers are:\t";
for(j=0;j<=y-1;j++)
{
cout << max[n] << "\t";
sum+=max[n];
n++;
}
double mean = sum/n;
cout << endl << "The Sum is: "<< sum << endl;
cout << "The mean is: " << mean << endl;
n=0;
j=0;
sum=0;
for(j=0;j<=y-1;j++)
{
max[n]=pow((max[n]-mean),2);
sum+=max[n];
n++;
}
variance=sum/(n-1);
cout << "Variance is: " << variance << endl;
cout << "Standard Deviation is: " << sqrt(variance) << "\n\n";
return 0;
}
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