I can't understand. why 2nd is giving error citing that "begin is not defined in scope?"???

Question

1st code
int create_array[]{100,200,300,400,500};
int *arr{nullptr};
arr = create_array;
for(int i{0} ; i<5 ; i++)
cout << arr[i] << endl;

2nd code
int create_array[]{100,200,300,400,500};
int *arr{nullptr};
arr = create_array;
for(int n: arr) //while create_array in place of arr =>fine
cout << n << endl;