/in/foo.cc: In function 'int main()':
/in/foo.cc:12:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i=0;i<strlen(c);i++)
                  ~^~~~~~~~~~
/in/foo.cc:28:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i=0;i<strlen(c);i++)
               ~^~~~~~~~~~
/in/foo.cc:10:14: warning: 'c[-1]' is used uninitialized in this function [-Wuninitialized]
  while (c[i-1]!='E')
         ~~~~~^