/in/foo.cc: In function 'int main()':
/in/foo.cc:6:3: error: 'cin' was not declared in this scope
    6 |   cin >>x>>y>>b,cout <<endl;
      |   ^~~
/in/foo.cc:6:17: error: 'cout' was not declared in this scope
    6 |   cin >>x>>y>>b,cout <<endl;
      |                 ^~~~
/in/foo.cc:6:24: error: 'endl' was not declared in this scope
    6 |   cin >>x>>y>>b,cout <<endl;
      |                        ^~~~