/in/foo.c: In function 'win':
/in/foo.c:5:19: error: 'nw' undeclared (first use in this function)
  printf("%d:%d\n",nw,nl)
                   ^~
/in/foo.c:5:19: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c:5:22: error: 'nl' undeclared (first use in this function)
  printf("%d:%d\n",nw,nl)
                      ^~
/in/foo.c:6:1: error: expected ';' before '}' token
 }
 ^