Compilare: user.cpp: In function ‘int main()’: user.cpp:19:5: warning: ‘char* gets(char*)’ is deprecated [-Wdeprecated-declarations] gets(sir+1); ^ In file included from /usr/include/c++/5/cstdio:42:0, from user.cpp:1: /usr/include/stdio.h:638:14: note: declared here extern char *gets (char *__s) __wur __attribute_deprecated__; ^ user.cpp:19:5: warning: ‘char* gets(char*)’ is deprecated [-Wdeprecated-declarations] gets(sir+1); ^ In file included from /usr/include/c++/5/cstdio:42:0, from user.cpp:1: /usr/include/stdio.h:638:14: note: declared here extern char *gets (char *__s) __wur __attribute_deprecated__; ^ user.cpp:19:15: warning: ‘char* gets(char*)’ is deprecated [-Wdeprecated-declarations] gets(sir+1); ^ In file included from /usr/include/c++/5/cstdio:42:0, from user.cpp:1: /usr/include/stdio.h:638:14: note: declared here extern char *gets (char *__s) __wur __attribute_deprecated__; ^ user.cpp:29:5: warning: ‘char* gets(char*)’ is deprecated [-Wdeprecated-declarations] gets(sir+1); ^ In file included from /usr/include/c++/5/cstdio:42:0, from user.cpp:1: /usr/include/stdio.h:638:14: note: declared here extern char *gets (char *__s) __wur __attribute_deprecated__; ^ user.cpp:29:5: warning: ‘char* gets(char*)’ is deprecated [-Wdeprecated-declarations] gets(sir+1); ^ In file included from /usr/include/c++/5/cstdio:42:0, from user.cpp:1: /usr/include/stdio.h:638:14: note: declared here extern char *gets (char *__s) __wur __attribute_deprecated__; ^ user.cpp:29:15: warning: ‘char* gets(char*)’ is deprecated [-Wdeprecated-declarations] gets(sir+1); ^ In file included from /usr/include/c++/5/cstdio:42:0, from user.cpp:1: /usr/include/stdio.h:638:14: note: declared here extern char *gets (char *__s) __wur __attribute_deprecated__; ^ user.cpp:51:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]