/in/foo.cc: In function 'int judge(int)':
/in/foo.cc:12:5: warning: statement has no effect [-Wunused-value]
    a/10;
    ~^~~
/in/foo.cc:10:6: warning: 'b' may be used uninitialized in this function [-Wmaybe-uninitialized]
   b++;
      ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:10:6: warning: 'b' may be used uninitialized in this function [-Wmaybe-uninitialized]
   b++;
      ^
/in/foo.cc:8:6: note: 'b' was declared here
  int b;
      ^