Sorting of Array in C++

#include<iostream>

using namespace std;

void sort(int a[],int n);                                    // call by reference is used
int max(int a[],int n);                                      // call by reference is used 
 
int main()
{
    int n;
    cout << "Enter size of array" << endl;
    cin >> n;
    int a[n];                                                       // Dynamic Initialization of array
    for(int i=0;i<n;i++)
        cin >> a[i];
    sort(a,n);
    cout << "Sorted array:" << endl;
    for(int i=0;i<n;i++)
        cout << a[i] << endl;
    return 0;
}

void sort (int a[],int n)
{
    int temp,ind;
    for(int i=n-1;i>0;i--)
    {
        ind=max(a,i);
        temp=a[ind];
        a[ind]=a[i];
        a[i]=temp;
    }   
}

int max(int a[],int n)
{
    int max=0,ind;
    for(int i=0;i<=n;i++)
    {
        if(max<a[i])
        {
            max=a[i];
            ind=i;
        }
    }
    return ind;
}