#include <stdio.h> char gif [4096*1024]; int main (void) { int screenwidth; int screenheight; int pos; strcpy (gif, "GIF87a"); screenwidth = 255; screenheight = 255; pos = strlen ("GIF87a"); gif [pos+0] = 0 gif [pos+1] = screenwidth; gif [pos+2] = 0 gif [pos+3] = screenheight; pos += 4; }