/in/foo.cc: In function 'int main()':
/in/foo.cc:79:17: warning: 'ey' may be used uninitialized in this function [-Wmaybe-uninitialized]
     if (w[ex][ey]==0) cout<<"There’s no wind!"<<endl;
         ~~~~~~~~^
/in/foo.cc:79:17: warning: 'ex' may be used uninitialized in this function [-Wmaybe-uninitialized]
/in/foo.cc:55:11: warning: 'sy' may be used uninitialized in this function [-Wmaybe-uninitialized]
     q[1].y=sy;
     ~~~~~~^~~
/in/foo.cc:54:11: warning: 'sx' may be used uninitialized in this function [-Wmaybe-uninitialized]
     q[1].x=sx;
     ~~~~~~^~~