Updating a 2d integer array in a struct with a pointer - c

Question

I'm trying to implement a coordinate system for a player in a game.
I have a struct
typedef struct player {
int playerPosition[1][5];
}
I create a pointer to that struct
struct* player playerPtr;
struct player playerOne;
playerPtr = &playerOne;
If during the game, I want to update the coordinate of the player to position [1,2].
I get errors when I use playerPtr->playerPosition=[1][2];
What's the correct way of doing this?

Answer 1

As written, you could do this:
playerPtr->playerPosition[0][2] = 100;
But probably you have an error here:
int playerPosition[1][5];
Because it rarely makes sense to have an array of size 1. Did you really mean for playerPosition to be a 1x5 array of ints? It looks like you wanted something like this:
struct position {
int x, y;
};
struct player {
position playerPosition;
};
Then you would do this:
playerPtr->playerPosition.x = 1;
playerPtr->playerPosition.y = 2;

Answer 2

playerPtr->playerPosition=[1][2]; will give you error (syntactically wrong)
you are not specifying the array index at which the data is to be stored, also you cant store data by that way in C.
correct way would be:
playerPtr->playerPosition[0][0] = 1;
playerPtr->playerPosition[0][1] = 2;
.
.
.
playerPtr->playerPosition[9][0] = 19;
playerPtr->playerPosition[9][1] = 20;
which is valid if you declare your array like this:
int playerPosition[10][2];
which will allow you to store ten coordinates.
2Dimentional arrays such as array[1][10] are same as array[10] (for usage, I am not certain about memory allocation, 2D array might require more memory)
I think you could use different but easier approach to this problem:
typedef struct position{
int x, y;
float refpos; //position from some reference point (like healing circle)
}position;
typedef struct player{
char name[20];
int health, attack, defense; //can be float too
position coord[20];
}player;
player player1, *playerPtr;
playerPtr = &player1;
playerPtr->position[0].x = 3;
playerPtr->position[0].y = 4;
playerPtr->position[0].refpos = 5; //Pythagorean triplet wrt origin (0,0)
Prost !