Add values to muldimentional array after declaration

[njitram2000]

I'm trying to make a big 3 dimentional array with a variable as value. Because of this, i cannot initialise it during declaration. I can't, however, find a way to insert the values into the array afterwars without inserting it one by one.
This is my code:

GLfloat faces[6][4][3];

faces =
{
	{	//face 1
		{ 0,0,0 },
		{ 0,size,0 },
		{ size,size,0 },
		{ size,0,0 }
	},
	{	//face 2
		{ size,0,0 },
		{ size,size,0 },
		{ size,size,size },
		{ size,0,size }
	},
	{	//face 3
		{ size,0,size },
		{ 0,0,size },
		{ 0,size,size },
		{ size,size,size }
	},
	{	//face 4
		{ 0,0,0 },
		{ 0,0,size },
		{ 0,size,size },
		{ 0,size,0 }
	},
	{	//face 5
		{ 0,size,0 },
		{ size,size,0 },
		{ size,size,size },
		{ 0,size,size }
	},
	{	//face 6
		{ 0,0,0 },
		{ size,0,0 },
		{ size,0,size },
		{ 0,0,size }
	}
};

It says there is a syntax error at "faces=".

I've tried it with a very simple version like

int a[2];
a= {1,2};

but that won't wok either. If I use

int a[2]={1,2};

then there's no problem but because i use the variable "face" in the bigger array, i can't initialise it like that.

How am I supposed to do this? I've tried an impossible number of combination and nothing seems to work but this has to be possible...

[Elysia]

If you're using C99, on the other hand, Bayint provided a good solution.
If you're using C90, then you can create a temporary array, initialize it, and copy it in a similar manner to Bayint's solution.

[Bayint Naung]

If you are using C99, you can use compound literal.

memcpy( faces,
( int [6][4][3]) 
{
	{	//face 1
		{ 0,0,0 },
		{ 0,size,0 },
		{ size,size,0 },
		{ size,0,0 }
	},
	{	//face 2
		{ size,0,0 },
		{ size,size,0 },
		{ size,size,size },
		{ size,0,size }
	},
	{	//face 3
		{ size,0,size },
		{ 0,0,size },
		{ 0,size,size },
		{ size,size,size }
	},
	{	//face 4
		{ 0,0,0 },
		{ 0,0,size },
		{ 0,size,size },
		{ 0,size,0 }
	},
	{	//face 5
		{ 0,size,0 },
		{ size,size,0 },
		{ size,size,size },
		{ 0,size,size }
	},
	{	//face 6
		{ 0,0,0 },
		{ size,0,0 },
		{ size,0,size },
		{ 0,0,size }
	}
},

sizeof(faces) );

Btw, make sure that you really need 3 dimensional array. Maybe you should be using struct?

[njitram2000]

Thanks Bayint, that works. It's too bad you have to use tricks like memcpy in c instead of something a bit more straightforward. I also didn't know you could include an array layout in a typecast.
I'm using it to define the vertices of a cube to draw in OpenGL. I don't think a struct would really work (I might be looking at it in the wrong way)

Elysia, I see one problem with your solution. I will be adjusting size to vary the size of the cube. Creating a temp array everytime I change the size will leave that memory used and if I try to declare another int with the same name, the compiler refuses to do so because it was already declared under that name. I tried using free() but that only works if the int was created with malloc which then just brings me back to my original problem. Do you have a way around that?

I'm using gcc from the MinGW package for windows and as it will compile, I guess I'm using c99 but how can I check which version the system is using?

[Elysia]

Thanks Bayint, that works. It's too bad you have to use tricks like memcpy in c instead of something a bit more straightforward. I also didn't know you could include an array layout in a typecast.
I'm using it to define the vertices of a cube to draw in OpenGL. I don't think a struct would really work (I might be looking at it in the wrong way)

I'm afraid that is how C is. A minimal language including only the most necessary features.

I'm using gcc from the MinGW package for windows and as it will compile, I guess I'm using c99 but how can I check which version the system is using?

MinGW is fully C99 compatible. There should be a C99 switch. You should enable pedantic and ansi or whatever these arguments are called in order to avoid bad practices and be fully standards compliant.