int arr[5] = {1,2,3,4,5}; for(int i=1; i<=5; i++) cout << arr[i] << " ";

int arr[5] = {1,2,3,4,5}; for(int i=0; i<5; i++) cout << arr[i] << " ";

int arr[5] = {1,2,3,4,5}; for(int i=0; i<=5; i++) cout << arr[i] << " ";

int arr[5] = {1,2,3,4,5}; for(int i=0; i<4; i++) cout << arr[i] << " ";