/in/foo.cc: In function 'int main()':
/in/foo.cc:12:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<strlen(s);i++)
                ^
/in/foo.cc:6:6: warning: unused variable 'sum1' [-Wunused-variable]
  int sum1,sum2;
      ^
/in/foo.cc:6:11: warning: unused variable 'sum2' [-Wunused-variable]
  int sum1,sum2;
           ^