/in/foo.cc: In function 'int main()':
/in/foo.cc:23:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(i=0;i<b.length();i++)
          ~^~~~~~~~~~~
/in/foo.cc:34:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(i=1;i<b.length();i++)
          ~^~~~~~~~~~~
/in/foo.cc:49:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(i=0;i<c.length()&&c[i]!='\0';i++)
          ~^~~~~~~~~~~
/in/foo.cc:46:9: warning: 'count' may be used uninitialized in this function [-Wmaybe-uninitialized]
  count++;
         ^