public static void main(String args[]) {
System.out.println("start.");
Lexer l = new Lexer();
while (true) {
try {
Token t = l.scan();
if (t.tag == Tag.NUM) {
System.out.println(
"Token : " + t.toString() + " , Tag:" + t.tag + " , value:" + ((Num) t).value);
} else if (t.tag == Tag.ID) {
System.out.println(
"Token : " + t.toString() + " , Tag:" + t.tag + " , lexeme:" + ((Word) t).lexeme);
} else {
System.out.println("Token : " + t.toString() + " , Tag:" + t.tag);
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
public UnaryOpTree(Token tok) {
this.symbol = tok.getSymbol();
}