/in/foo.cc: In function 'int main()':
/in/foo.cc:19:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int j=0;j<c.length();j++)
                ^
/in/foo.cc:14:19: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
     string c; int y;
                   ^