Store 4 different values in a byte

Question

I have an assignment to do, but I have no clue where to start. I am not expecting and definitely do not want answers in code. I would like some guidance as in what to do because

Answer 1

Here is another way of doing it.

    unsigned int i = 0;

    engine_on = 1;
    gear_pos =2;
    key_pos = 2;
    brake1 = 1;
    brake2 = 1;

    i |= s1.brake2;
    i |= (s1.brake1 << 1);
    i |= (s1.key_pos << 2);
    i |= (s1.gear_pos << 4);
    i |= (s1.engine_on << 7);