/in/foo.cc: In function 'int main()':
/in/foo.cc:23:11: warning: unused variable 'j' [-Wunused-variable]
     int i,j,k;
           ^
/in/foo.cc:23:13: warning: unused variable 'k' [-Wunused-variable]
     int i,j,k;
             ^
/in/foo.cc:31:33: warning: 'mi' may be used uninitialized in this function [-Wmaybe-uninitialized]
         string x="99999999";int mi;
                                 ^~