/in/foo.c: In function 'output':
/in/foo.c:14:61: error: 'w' undeclared (first use in this function)
   if ( ((W == type || L == type) && (abs(W - L) >= 2)) || ((w>type||l>type)&&(abs(l-w)==2)))
                                                             ^
/in/foo.c:14:61: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c:14:69: error: 'l' undeclared (first use in this function)
   if ( ((W == type || L == type) && (abs(W - L) >= 2)) || ((w>type||l>type)&&(abs(l-w)==2)))
                                                                     ^