Question

C is like chinese to me but i got to work with some code

struct Message {
    unsigned char      state;
};

char state   [4][4] = { "OFF", "ON", "IL1", "IL2" };

This is a simple server that receives a message. The Struct part of it is obvious, but then theres that char array thing. Does this say theres 4 different char arrays, each containing 4 chars? What exactly is going on here? I know this sounds stupid but I cant figure it out.

Answer 1

It means that state is an array of 4 char arrays, each of them is an array of 4 char, and they are initialized with the values “OFF\0”, “ON\0”, “IL1\0” and “IL2\0”

         +----+----+----+----+
state => |OFF |ON  |IL1 |IL2 |
         +----+----+----+----+
         ^state[0]
              ^state[1]
                   ^state[2]
                        ^state[4]