/in/foo.cc: In function 'int main()':
/in/foo.cc:6:13: warning: 'a' is used uninitialized [-Wuninitialized]
    6 | cout<<"  "<<a<<endl;
      |             ^
/in/foo.cc:5:6: note: 'a' was declared here
    5 | char a;
      |      ^