/in/foo.cc: In function 'int main()':
/in/foo.cc:8:11: warning: unused variable 'b' [-Wunused-variable]
  int a[2],b[2];
           ^
/in/foo.cc:34:16: warning: 'bz' may be used uninitialized in this function [-Wmaybe-uninitialized]
  int result=(az+bz)/2;
             ~~~^~~~
/in/foo.cc:34:16: warning: 'az' may be used uninitialized in this function [-Wmaybe-uninitialized]