Updating display on screen?

I wrote a simple program to print a grid of 0s on the screen, and move a 1 around with user input from the keyboard (eventually, the goal is a "snake" game).

It works fine. I hit W, it moves the 1 up one space. I hit A, it moves it to the left, etc.

The problem I'm having is that each time it prints a whole new box. I would much rather have it update the same box each time I hit a key, and I have no idea how to do that.

I'm currently using this to print my box each time I update the location of my 1:

Code:

---

for(i=0;i<boxsize;i++){
          for(j=0;j<boxsize;j++){
                    printf("%d",grid[i][j]);
}
          printf("\n");
}

---

How would I make it draw the box only once, and simply update "pixels" in the array as I enter input?

Use printf("%d\r", ...) to print on the same line. Note that you may have to use fflush(stdout) to make sure the data is ACTUALLY printed.

--
Mats

Curses. PDCurses for windows.

Okay, a little more robust of an answer is "cursor control (pixels as you erroniously call them) is not a part of the standard C library and requires external library support." Curses is a standardized library that you can use to acomplish what you're looking for.

And it just so happens that I've written a little tutorial for setting up PDCurses if you have Code::Blocks.