/in/foo.cc: In function 'int main()':
/in/foo.cc:18:2: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
  gets(fbi);
  ^~~~
In file included from /in/foo.cc:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/in/foo.cc:18:10: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
  gets(fbi);
          ^
In file included from /in/foo.cc:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/in/foo.cc:20:7: warning: variable 'T' set but not used [-Wunused-but-set-variable]
  char T;
       ^
/in/foo.cc: In function 'char viewTree(int, int)':
/in/foo.cc:31:8: error: invalid conversion from 'const char*' to 'char' [-fpermissive]
    t = "B"
        ^~~
/in/foo.cc:32:4: error: expected ';' before 'printf'
    printf("%c",t);
    ^~~~~~
/in/foo.cc:36:8: error: invalid conversion from 'const char*' to 'char' [-fpermissive]
    t = "I"
        ^~~
/in/foo.cc:37:4: error: expected ';' before 'printf'
    printf("%c",t);
    ^~~~~~
/in/foo.cc:47:10: warning: comparison with string literal results in unspecified behavior [-Waddress]
  if (tl=="B" && tr=="B"){
          ^~~
/in/foo.cc:47:10: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
/in/foo.cc:47:21: warning: comparison with string literal results in unspecified behavior [-Waddress]
  if (tl=="B" && tr=="B"){
                     ^~~
/in/foo.cc:47:21: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
/in/foo.cc:48:7: error: invalid conversion from 'const char*' to 'char' [-fpermissive]
   t = "B"
       ^~~
/in/foo.cc:49:3: error: expected ';' before 'printf'
   printf("%c",t);
   ^~~~~~
/in/foo.cc:53:11: warning: comparison with string literal results in unspecified behavior [-Waddress]
   if (tl=="I" && tr=="I"){
           ^~~
/in/foo.cc:53:11: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
/in/foo.cc:53:22: warning: comparison with string literal results in unspecified behavior [-Waddress]
   if (tl=="I" && tr=="I"){
                      ^~~
/in/foo.cc:53:22: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
/in/foo.cc:54:13: error: invalid conversion from 'const char*' to 'char' [-fpermissive]
         t = "I"
             ^~~
/in/foo.cc:55:4: error: expected ';' before 'printf'
    printf("%c",t);
    ^~~~~~
/in/foo.cc:59:13: error: invalid conversion from 'const char*' to 'char' [-fpermissive]
         t = "F"
             ^~~
/in/foo.cc:60:4: error: expected ';' before 'printf'
    printf("%c",t);
    ^~~~~~