Getting error: "control reaches end of non-void function"

I am not able to run this code, please help!

#include <iostream>
using namespace std;

class Array
{
private:
    int n;
    int d;
    int *A;

public:
    Array()
    {
        n = 10;
        d = 1;
        A = new int[n];
    }
    Array(int sz, int rot)
    {
        n = sz;
        d = rot;
        A = new int[n];
        for(int i = 0; i < n; i++)
        {
            cin>>A[i];
        }
    }
    ~Array()
    {
        delete []A;
    }
        
        
    int rotate();
    void Insert(int n,int x);
};

int Array::rotate()
{
    int z = 1;
    int *B;
    B = new int[n];
    while(z <= d)
    {
        for(int i = 0; i < n; i++)
        {
            B[i] = A[i];
        }

        for(int i = 0,j = 0; i < n-1, j < n-1; i++,j++)
        {
            A[i] = B[j+1];
        }
        A[n-1] = B[0];
        z++;
    }
}

void Array::Insert(int index,int x)
{
    int i;
    if(index>=0 && index <=n)
    {
        for(i=n;i>index;i--)
            A[i]=A[i-1];
        A[index]=x;
        n++;
    }
}

int main()
{   
    Array arr1(5,2);
    arr1.Insert(0,5);
    arr1.Insert(1,10);
    arr1.Insert(2,20);
    arr1.Insert(3,30);
    arr1.Insert(4,40);
    cout<<arr1.rotate();

    return 0;
}

The question is as follows:

A left rotation operation on an array of size n shifts each of the array's elements l unit to the left. Given an integer, d, rotate the array that many steps left and return the result.

Ex:

d = 2
arr = [1,2,3,4,5]

after 2 rotations:
arr1 = [3,4,5,1,2]

Input Format:
The first line contains two space-separated integers that denote n, the number of integers, and ,d the number of left rotations to perform.

The second line contains n space-separated integers that describe.