1. Work through the above statements with pencil and paper, substituting results for calls. 2. Here is a method named twice, which returns the doubled value of its int parameter: private int twice(int...

1. Work through the above statements with pencil and paper, substituting results for calls.

2. Here is a method named twice, which returns the doubled value of its int parameter:

private int twice(int n) {

return 2 * n;

}

Here are some calls:

int n = 3;

int r;

r = twice(n);

r = twice(n + 1);

r = twice(n) + 1;

r = twice(3 + 2 * n);

r = twice(twice(n));

r = twice(twice(n + 1));

r = twice(twice(n) + 1);

r = twice(twice(twice(n)));

For each call, state the returned value.