Compilare: user.c: In function ‘main’: user.c:6:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("paranteze2.in","r",stdin),freopen("paranteze2.out","w",stdout),gets(s+1); ^ user.c:6:47: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("paranteze2.in","r",stdin),freopen("paranteze2.out","w",stdout),gets(s+1); ^ user.c:6:81: warning: ignoring return value of ‘gets’, declared with attribute warn_unused_result [-Wunused-result] freopen("paranteze2.in","r",stdin),freopen("paranteze2.out","w",stdout),gets(s+1); ^ /tmp/ccSsvVZ1.o: In function `main': user.c:(.text.startup+0x56): warning: the `gets' function is dangerous and should not be used.