/in/foo.cc: In function 'int main()':
/in/foo.cc:9:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(i=0;i<sizeof(word);i++) x=word[i];
             ~^~~~~~~~
/in/foo.cc:10:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(i=0;i<sizeof(word);i++)
             ~^~~~~~~~
/in/foo.cc:6:36: warning: unused variable 'l' [-Wunused-variable]
     string word;char x;int s[26],i,l=0,xn,nn,n;bool y=true;
                                    ^