/in/foo.cc: In function 'int main()':
/in/foo.cc:17:10: warning: statement has no effect [-Wunused-value]
         a/10;
         ~^~~
/in/foo.cc:10:13: warning: 'b' is used uninitialized in this function [-Wuninitialized]
         if(b%10==0)
            ~^~~