Compilare: user.c: In function ‘init’: user.c:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:10: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c: In function ‘run’: user.c:22: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result user.c:23: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result user.c:24: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result user.c:25: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result