Compilare: user.c: In function ‘main’: user.c:46:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen(InFile,"r",stdin); ^ user.c:47:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen(OutFile,"w",stdout); ^ user.c:51:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&x); ^