Eroare de compilare: user.c: In function 'main': user.c:9: warning: passing argument 2 of 'freopen' from incompatible pointer type user.c:9: error: too few arguments to function 'freopen' user.c:10: warning: passing argument 2 of 'freopen' from incompatible pointer type user.c:10: error: too few arguments to function 'freopen' user.c:34: error: 'u' undeclared (first use in this function) user.c:34: error: (Each undeclared identifier is reported only once user.c:34: error: for each function it appears in.) user.c:35: error: 'v' undeclared (first use in this function)