Compilare: user.c: In function ‘getNumbers’: user.c:22:41: warning: comparison between pointer and integer [enabled by default] while( (*p < '0' || *p > '9') && *p != NULL ) ^ user.c:24:41: warning: comparison between pointer and integer [enabled by default] while( *p >= '0' && *p <= '9' && *p != NULL ) ^ user.c:32:41: warning: comparison between pointer and integer [enabled by default] while( (*p < '0' || *p > '9') && *p != NULL ) ^ user.c:34:43: warning: comparison between pointer and integer [enabled by default] while( (*p >= '0' && *p <= '9') && *p != NULL ) ^ user.c: In function ‘main’: user.c:44:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen(InFile,"r",stdin); ^ user.c:45:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen(OutFile,"w",stdout); ^ user.c:48:9: warning: ignoring return value of ‘gets’, declared with attribute warn_unused_result [-Wunused-result] gets(lin); ^ user.c:52:13: warning: ignoring return value of ‘gets’, declared with attribute warn_unused_result [-Wunused-result] gets(lin); ^ /tmp/ccF1MjHO.o: In function `main': user.c:(.text.startup+0x58): warning: the `gets' function is dangerous and should not be used.