I tried running a program that made an array, but when I tried to run the array, it returned the error stated in the title.

This was my code

#include <iostream>
using namespace std;
int main(){
    int len;
    cout<<"How long is your array? ";
    cin>>len;
    int arr[len]={};
    for (int i; i<=len; i++){
        cout<<i;
        arr[i-1]=0;
    }
    return(arr); //error happened here.
}