/in/foo.cc: In function 'int main()':
/in/foo.cc:10:9: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
         gets(s);
         ^
In file included from /usr/include/c++/5/cstdio:42:0,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:46,
                 from /in/foo.cc:1:
/usr/include/stdio.h:638:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^
/in/foo.cc:10:9: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
         gets(s);
         ^
In file included from /usr/include/c++/5/cstdio:42:0,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:46,
                 from /in/foo.cc:1:
/usr/include/stdio.h:638:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^
/in/foo.cc:10:15: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
         gets(s);
               ^
In file included from /usr/include/c++/5/cstdio:42:0,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:46,
                 from /in/foo.cc:1:
/usr/include/stdio.h:638:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^
/in/foo.cc:11:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int i=0;i<strlen(s);i++)
                      ^
/in/foo.cc:10:16: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result [-Wunused-result]
         gets(s);
                ^
/tmp/cc4304Uh.o: In function `main':
foo.cc:(.text.startup+0x4d): warning: the `gets' function is dangerous and should not be used.