Week 2

Posted on November 2, 2017November 1, 2017 by Yushen

Solution 2.1:

Number ::= -? PDigit (Underscore Digit)* | 0
Underscore ::= _*
PDigit ::= 1 | … | 9
Digit ::= 0 | PDigit

Solution 2.2:

a+ : a a*

1. (a | c | … | z)*
2. (a|b) letter* c
3. (a letter* b) | (b letter* a)

Solution 2.3:

public class Meiern extends MiniJava {
    public static void main(String[] args) {
        int number, lastNumber;     // Aktueller und letzter Wurf
        int firstDraw, secondDraw;  // Wuerfelaugen
        int playerNumber;           // Spieler (0), Computer (1)
        int output;

        lastNumber = playerNumber = 0;

        number = 1;
        while (number > lastNumber) {
            lastNumber = number;

            // Zweimal wuerfeln:
            firstDraw = dice();
            secondDraw = dice();

            //System.out.print("" + firstDraw + secondDraw);

            // Wuerfelaugen zu einer zweistelligen Zahl kombinieren:
            if (firstDraw > secondDraw) {
                number = firstDraw * 10 + secondDraw;
            } else if (secondDraw > firstDraw) {
                number = firstDraw + secondDraw * 10;
            } else {
                // Pasch ist mehr Wert als ein normaler Wurf
                number = firstDraw * 100 + secondDraw * 10;
            }

            //System.out.println(" " + number);

            if (number == 21) {
                // 21 => "Meier"
                number = number * 1000;
            }

            output = number;
            while (output > 100) {
                output = output / 10;
            }
            if (playerNumber == 0) {
                write("Du wuerfelst " + output);
            } else {
                write("Computer wuerfelt " + output);
            }

            // Naechster Spieler:
            playerNumber = 1 - playerNumber;
        }
        if (playerNumber == 0) {
            write("Du hast gewonnen");
        } else {
            write("Computer hat gewonnen");
        }
    }
}

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