/in/foo.cc: In function 'void sc(int)':
/in/foo.cc:23:6: warning: unused variable 'b1' [-Wunused-variable]
  int b1;
      ^~
/in/foo.cc: In function 'int main()':
/in/foo.cc:43:2: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
  gets(a+1);
  ^~~~
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:43:10: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
  gets(a+1);
          ^
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: In function 'void sc(int)':
/in/foo.cc:22:6: warning: 'b' may be used uninitialized in this function [-Wmaybe-uninitialized]
  int b;
      ^
/tmp/ccfuHg8i.o: In function `main':
foo.cc:(.text.startup+0x10): warning: the `gets' function is dangerous and should not be used.