/in/foo.c: In function 'main':
/in/foo.c:24:34: warning: 'nowy' may be used uninitialized in this function [-Wmaybe-uninitialized]
   if((k-abs(x-nowx)-abs(y-nowy)-1-nowy)>=0)
      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~
/in/foo.c:29:20: warning: 'nowx' may be used uninitialized in this function [-Wmaybe-uninitialized]
             a[y][x]=0;
             ~~~~~~~^~