/in/foo.cc: In function 'int main()':
/in/foo.cc:10:9: warning: statement has no effect [-Wunused-value]
   sum*10+x%10;
   ~~~~~~^~~~~
/in/foo.cc:6:8: warning: unused variable 'y' [-Wunused-variable]
  int x,y,sum=0;
        ^