/in/foo.cc: In function 'int main()':
/in/foo.cc:31:9: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
         gets(a);
         ^~~~
In file included from /usr/include/c++/6/cstdio:42:0,
                 from /in/foo.cc:2:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/in/foo.cc:31:15: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
         gets(a);
               ^
In file included from /usr/include/c++/6/cstdio:42:0,
                 from /in/foo.cc:2:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/in/foo.cc:36:5: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
     gets(a);
     ^~~~
In file included from /usr/include/c++/6/cstdio:42:0,
                 from /in/foo.cc:2:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/in/foo.cc:36:11: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
     gets(a);
           ^
In file included from /usr/include/c++/6/cstdio:42:0,
                 from /in/foo.cc:2:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/in/foo.cc:38:9: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
         gets(a);
         ^~~~
In file included from /usr/include/c++/6/cstdio:42:0,
                 from /in/foo.cc:2:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/in/foo.cc:38:15: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
         gets(a);
               ^
In file included from /usr/include/c++/6/cstdio:42:0,
                 from /in/foo.cc:2:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/tmp/ccBGxYWj.o: In function `main':
foo.cc:(.text.startup+0x3a): warning: the `gets' function is dangerous and should not be used.