/in/foo.cc: In function 'int main()':
/in/foo.cc:5:11: warning: 'A' is used uninitialized in this function [-Wuninitialized]
     cout<<A<<endl;
           ^
/in/foo.cc:6:11: warning: 'AAA' is used uninitialized in this function [-Wuninitialized]
     cout<<AAA<<endl;
           ^~~
/in/foo.cc:7:11: warning: 'AAAAA' is used uninitialized in this function [-Wuninitialized]
     cout<<AAAAA<<endl;
           ^~~~~
/in/foo.cc:8:11: warning: 'AAAAAAA' is used uninitialized in this function [-Wuninitialized]
     cout<<AAAAAAA<<endl;
           ^~~~~~~