Compilare: user.c: In function ‘main’: user.c:51: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:52: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:54: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result user.c:55: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result user.c: In function ‘cautare_bin’: user.c:41: warning: control reaches end of non-void function