Compilare: user.c: In function ‘main’: user.c:12:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("paranteze2.in", "r", stdin); ^ user.c:13:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("paranteze2.out", "w", stdout); ^ user.c:15:6: warning: ignoring return value of ‘gets’, declared with attribute warn_unused_result [-Wunused-result] gets(s); ^ /tmp/ccQxPklS.o: In function `main': user.c:(.text.startup+0x56): warning: the `gets' function is dangerous and should not be used.