Thread: Help fixing for loop

Hi,

I am just learning C, so I am sorry if my questions are trivial. I'm basically programming the "15-puzzle" which looks like this: File:15-puzzle.svg - Wikipedia, the free encyclopedia

So I'm basically writing a function init_tiles() which initializes all 16 tiles to have a color and number, and then calls initialize_tile. I know that my steps are correct, but my for loop is incorrect. The board itself is comprised of 4 rows and 4 columns, so it's length is 16. Below is my code..if someone could help me fix my for loop, I'd appreciate it greatly! I basically have to loop through each tile in my global array title_data[16][21*21] which is basically a global 2 dimensional array that holds the colors for all the pixels for all of the tiles. Row = tile #, column = pixel color.

Code:

 void init_tiles(){
	int col, row;
	int color;
	int tile_index, digit1, digit2;


	for(int col = 0; col < col.length; ++col) {
		for (int row = 0; row < row.length; ++row) {
			// calculate the background color for each tile
			if (((col + row) / 2) == 0) {
				color = WHITE;
			}
			else {
				color = RED;
			}
			// calculate the 2 digits placed on each tile
			tile_index = col + row * 4;
			digit1 = (title_index + 1) / 10;
			digit2 = (title_index + 1) % 10;


			initialize_tile(tile_index, digit1, digit2, color, BLACK);




		}
	}


	// for the blank tile, set all of the pixels to BLACK
	// **TO DO: FOR each pixel in the tile,
	//       tile_data[15][pixel] = BLACK;
	for () {
		tile_data[15][pixel];
	}
}

Code:

int col;
...
col.length

You might want to learn basic C before you start tackling relatively difficult problems.