Why can't I have a variable in switch-case statement? [duplicate]

Answer 1

Replace this long clumsy code,

switch(c)
{
    case up_key:
        move(0, -1);
        break;

    case down_key:
        move(0, 1);
        break;

    case left_key:
        move(-1, 0);
        break;

    case right_key:
        move(1,0);
        break;

    default:
        return false;
}

with something like this:

move( (c==right_key) - (c==left_key) , (c==down_key) - (c==up_key) );

You can litterly replace that 17 lines long of code with that much more neat single line of code.