foo.cc: In function ‘int main()’:
foo.cc:11:48: error: expected primary-expression before ‘;’ token
   11 |                                 cout<<a<<b<<c<<;
      |                                                ^
foo.cc:13:48: error: expected primary-expression before ‘;’ token
   13 |                                 cout<<a<<c<<b<<;
      |                                                ^
foo.cc:15:40: error: expected primary-expression before ‘;’ token
   15 |                         cout<<c<<a<<b<<;
      |                                        ^
foo.cc:19:48: error: expected primary-expression before ‘;’ token
   19 |                                 cout<<b<<c<<a<<;
      |                                                ^
foo.cc:21:48: error: expected primary-expression before ‘;’ token
   21 |                                 cout<<c<<b<<a<<;
      |                                                ^
foo.cc:23:40: error: expected primary-expression before ‘;’ token
   23 |                         cout<<b<<a<<c<<;
      |                                        ^