/in/foo.cc: In function 'int count(int)':
/in/foo.cc:11:4: warning: statement has no effect [-Wunused-value]
   n/10;   
   ~^~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:26:10: warning: unused variable 'sum' [-Wunused-variable]
  int A,B,sum=0,i;
          ^~~
/in/foo.cc:26:16: warning: unused variable 'i' [-Wunused-variable]
  int A,B,sum=0,i;
                ^