/in/foo.cc: In function 'int main()':
/in/foo.cc:4:7: warning: unknown escape sequence: '\040'
    4 | cout<<"\    /\    /\n";
      |       ^~~~~~~~~~~~~~~~
/in/foo.cc:4:7: warning: unknown escape sequence: '\040'
/in/foo.cc:5:7: warning: unknown escape sequence: '\040'
    5 | cout<<" \  /  \  /\n";
      |       ^~~~~~~~~~~~~~~
/in/foo.cc:5:7: warning: unknown escape sequence: '\040'
/in/foo.cc:6:7: warning: unknown escape sequence: '\/'
    6 | cout<<"  \/    \/\n";
      |       ^~~~~~~~~~~~~~
/in/foo.cc:6:7: warning: unknown escape sequence: '\/'