/in/foo.cc: In function 'void read()':
/in/foo.cc:19:14: error: unable to find character literal operator 'operator""or' with 'char' argument
    }if (c == '0'or c == 'O' or c == 'o') {// 
              ^~~~~
/in/foo.cc:19:20: error: expected ')' before 'c'
    }if (c == '0'or c == 'O' or c == 'o') {// 
                    ^