Ok, Im confused

Ive written a tetris clone one of my first reall programs. While I used a tutorial to get the basic outline and functions I didnt use there code. After several days of learning GDI calls I finaly managed to get the block on screen and falling down. I was pretty estatic. A few switched variable fixes later I had it up and running pretty well i thought. That was untill I answed the phone and was chatting letting the program run. My collision detection isnt the greatest, took a few revisions to get it right but i thought i had it working great. ( and i did as i later discoverd) when i saw all the blocks just clump up at the top and it not starting a new game. I thought for shure it was my detection wasnt returning true when the blocks moved meaning to start a new game. After an hour or so in the debugger I found it wasnt my collision at all. It was the newgame call.

Code:

void NewGame()
{
	start_time = GetTickCount();
	GAMESTARTED = false;
	int y = 0, x = 0 ;

	//startout the map
	for(;x<MAPWIDTH;x++)
	{
		for(;y<MAPHEIGHT+1;y++)
		{
			if(y==MAPHEIGHT)  Map[x][y] = TILEGREY;
			else
				Map[x][y] = TILEBLACK;
		}
	}

thats my new game function. it gets called on initalazion and when collision returns true during the movement function.

What ended up causeing the error is where i declare y and x as 0.

if i change it to..

Code:

	//startout the map
	for(int x = 0;x<MAPWIDTH;x++)
	{
		for(int y = 0;y<MAPHEIGHT+1;y++)

it works. I have no idea why from everything ive learned that should be the exact same save for where its done. Newgame is only called on initalize and a true on collision during move. So its not run though part way at any other time and even if it were the loops would be run any way. I cant figure out how thats any diffrent and why its causeing problems. Can any one else explain it?

Thanks
~Meloshski

the problem is the 'y' variable in the second loop needs to be initialized each iteration of the first loop...

Oh my god... I think im just going to go shoot my self and save the world some of my stupidity.

Thanks