Question

I am doing this assignment, and there are some stuff (from start-up materials) that I cannot comprehend.

typedef enum
{
    NORTH,
    EAST,
    SOUTH,
    WEST,
    NUM_POINTS
} Point;

typedef Point Course[NUM_POINTS] ;

I don’t get the idea behind the last line , and how can I use it in the code?

Answer 1

typedef a b;

Makes b an alias for type a, e.g.

typedef int foo;

int bar;
foo bar;

both bars are equivalent. In your case,

typedef Point Course[NUM_POINTS] ;

Makes Course an alias for type Point[NUM_POINTS] (where NUM_POINTS == 4), so

Course baz;
Point baz[NUM_POINTS];

are equivalent.