Cpp program to remove duplicate elements from an array using function

Write a program to remove the duplicate elements from an array using function 

#include<iostream>
using namespace std;

// Function declaration
int removeDuplicates(int arr[], int size);

int main() {
    int arr[50],size;
    cout<<"Desired array size";
    cin>>size;
    cout<<"Enter the elements in an array";
    for(int a=0;a<size;a++)
    {
        cin>>arr[a];
    }

    // Remove duplicates using the function
    size = removeDuplicates(arr, size);

    cout << "Array without duplicates: ";
    for (int i = 0; i < size; ++i) {
        cout << arr[i] << " ";
    }
    cout << endl;

    return 0;
}
// Function definition
int removeDuplicates(int arr[],int size){
    for (int i = 0; i < size; i++) {
        //cout<<"Value of i is"<<i<<endl;
        for (int j = i + 1; j < size; j++) {
            // cout<<"Value of j is"<<j<<endl;
            if(arr[i]==arr[j]) {
                //cout<<"REPEATED Number is : "<<arr[i]<<" ";
                // Shift elements to the left starting from the duplicate element
                for (int k = j; k < size - 1; k++) {
                    arr[k] = arr[k + 1];
                   // cout<< "new Value "<<arr[k]<<endl;
                }
                size--;
                //cout<<"Size is :"<<size<<endl;
            }
        }
    }
    return size;
}

Desired array size

7

Enter the elements in an array

12

13

4

5

4

13

6

Array without duplicates: 12 13 4 5 6