/in/foo.cc: In function 'int main()':
/in/foo.cc:8:5: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
     gets(a);
     ^~~~
In file included from /usr/include/c++/6/cstdio:42:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:46,
                 from /in/foo.cc:1:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/in/foo.cc:8:11: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
     gets(a);
           ^
In file included from /usr/include/c++/6/cstdio:42:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:46,
                 from /in/foo.cc:1:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/in/foo.cc:9:5: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
     gets(b);
     ^~~~
In file included from /usr/include/c++/6/cstdio:42:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:46,
                 from /in/foo.cc:1:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/in/foo.cc:9:11: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
     gets(b);
           ^
In file included from /usr/include/c++/6/cstdio:42:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:46,
                 from /in/foo.cc:1:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/in/foo.cc:22:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
     for (i=0;i<lentha;i++)
     ^~~
/in/foo.cc:28:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
         for (i=0;i<lentha+lenthb;i++)
         ^~~
/tmp/ccu8afs7.o: In function `main':
foo.cc:(.text.startup+0x22): warning: the `gets' function is dangerous and should not be used.