/in/foo.cc: In function 'int main()':
/in/foo.cc:144:5: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
     gets(s);
     ^~~~
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:144:11: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
     gets(s);
           ^
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:155:5: warning: this 'while' clause does not guard... [-Wmisleading-indentation]
     while(ch==10)ch=getchar();getchar();
     ^~~~~
/in/foo.cc:155:31: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'while'
     while(ch==10)ch=getchar();getchar();
                               ^~~~~~~
/in/foo.cc:161:9: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
         gets(w[i]);
         ^~~~
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:161:18: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
         gets(w[i]);
                  ^
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 'int c(char)':
/in/foo.cc:29:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
/in/foo.cc: In function 'int to(int, int, char)':
/in/foo.cc:45:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
/tmp/ccHljHzf.o: In function `main':
foo.cc:(.text.startup+0x2f): warning: the `gets' function is dangerous and should not be used.