Compilare: user.cpp: In function ‘int main()’: user.cpp:68:5: warning: ‘char* gets(char*)’ is deprecated [-Wdeprecated-declarations] gets(sir); ^~~~ In file included from /usr/include/c++/6/cstdio:42:0, from /usr/include/c++/6/ext/string_conversions.h:43, from /usr/include/c++/6/bits/basic_string.h:5417, from /usr/include/c++/6/string:52, from /usr/include/c++/6/bits/locale_classes.h:40, from /usr/include/c++/6/bits/ios_base.h:41, from /usr/include/c++/6/ios:42, from /usr/include/c++/6/istream:38, from /usr/include/c++/6/fstream:38, from user.cpp:2: /usr/include/stdio.h:638:14: note: declared here extern char *gets (char *__s) __wur __attribute_deprecated__; ^~~~ user.cpp:68:13: warning: ‘char* gets(char*)’ is deprecated [-Wdeprecated-declarations] gets(sir); ^ In file included from /usr/include/c++/6/cstdio:42:0, from /usr/include/c++/6/ext/string_conversions.h:43, from /usr/include/c++/6/bits/basic_string.h:5417, from /usr/include/c++/6/string:52, from /usr/include/c++/6/bits/locale_classes.h:40, from /usr/include/c++/6/bits/ios_base.h:41, from /usr/include/c++/6/ios:42, from /usr/include/c++/6/istream:38, from /usr/include/c++/6/fstream:38, from user.cpp:2: /usr/include/stdio.h:638:14: note: declared here extern char *gets (char *__s) __wur __attribute_deprecated__; ^~~~ user.cpp:68:14: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(sir); ^ /tmp/ccIlLvsm.o: In function `main': user.cpp:(.text.startup+0x25): warning: the `gets' function is dangerous and should not be used.