Compilare: user.c: In function ‘init’: user.c:52: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:53: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c: In function ‘read’: user.c:79: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result user.c:80: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result user.c:83: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result