foo.cc:14:15: warning: multi-character character constant [-Wmultichar]
   14 |         cout<<'AAA'<<endl;
      |               ^~~~~
foo.cc:15:15: warning: character constant too long for its type
   15 |         cout<<'AAAAA'<<endl;
      |               ^~~~~~~
foo.cc:16:15: warning: character constant too long for its type
   16 |         cout<<'AAAAAAA'<<endl;
      |               ^~~~~~~~~

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