/in/foo.c: In function 'main':
/in/foo.c:11:3: warning: 'gets' is deprecated [-Wdeprecated-declarations]
   gets(s);
   ^~~~
In file included from /in/foo.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/in/foo.c:19:19: warning: unused variable 'ii' [-Wunused-variable]
  int i=0,result=0,ii=0,index;
                   ^~
/in/foo.c:69:5: warning: 'index' may be used uninitialized in this function [-Wmaybe-uninitialized]
     for(int j=strlen(s)-1;j>index;j--)
     ^~~
/tmp/ccnOfuIx.o: In function `main':
foo.c:(.text.startup+0x2a): warning: the `gets' function is dangerous and should not be used.