Eroare de compilare: user.c: In function ‘check’: user.c:11: error: ‘roo’ undeclared (first use in this function) user.c:11: error: (Each undeclared identifier is reported only once user.c:11: error: for each function it appears in.) user.c: In function ‘main’: user.c:27: warning: unused variable ‘j’ user.c:28: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:29: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:30: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result