/in/foo.cc: In function 'int main()':
/in/foo.cc:18:3: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
   gets(ch+1);
   ^~~~
In file included from /usr/include/c++/6/cstdio:42:0,
                 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:18:12: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
   gets(ch+1);
            ^
In file included from /usr/include/c++/6/cstdio:42:0,
                 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:27:4: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
    gets(ch+1);
    ^~~~
In file included from /usr/include/c++/6/cstdio:42:0,
                 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:27:13: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
    gets(ch+1);
             ^
In file included from /usr/include/c++/6/cstdio:42:0,
                 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:35:27: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
      for(j=i+1;j<=len;j++)gets(ch);
                           ^~~~
In file included from /usr/include/c++/6/cstdio:42:0,
                 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:35:34: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
      for(j=i+1;j<=len;j++)gets(ch);
                                  ^
In file included from /usr/include/c++/6/cstdio:42:0,
                 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:55:7: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
       gets(ch+1);
       ^~~~
In file included from /usr/include/c++/6/cstdio:42:0,
                 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:55:16: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
       gets(ch+1);
                ^
In file included from /usr/include/c++/6/cstdio:42:0,
                 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:62:30: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
         for(j=i+1;j<=len;j++)gets(ch);
                              ^~~~
In file included from /usr/include/c++/6/cstdio:42:0,
                 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:62:37: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
         for(j=i+1;j<=len;j++)gets(ch);
                                     ^
In file included from /usr/include/c++/6/cstdio:42:0,
                 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:77:14: warning: array subscript has type 'char' [-Wchar-subscripts]
     st[s[t--]]=0;
              ^
/in/foo.cc:83:27: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
      for(j=i+1;j<=len;j++)gets(ch);
                           ^~~~
In file included from /usr/include/c++/6/cstdio:42:0,
                 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:83:34: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
      for(j=i+1;j<=len;j++)gets(ch);
                                  ^
In file included from /usr/include/c++/6/cstdio:42:0,
                 from /in/foo.cc:1:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/tmp/cczdpIOs.o: In function `main':
foo.cc:(.text.startup+0xdd): warning: the `gets' function is dangerous and should not be used.