Number Cruncher by manish

/*
 * ;;;Created by manish
 */

import java.util.*;

public class NumberCruncher {

    static int score, rounds, lastround, target;
    static int[] nums = new int[6];
    static int m;

    public static void main(String s[]) {
        System.out.println("Welcome to Number Cruncher! ");

        choice();
    }

    static void choice() {
        System.out.println("Main Menu:- ");
        System.out.println("|  1. Play  |  2. Rules  |  3. Quit ");
        int choice = new Scanner(System.in).nextInt();
        if (choice == 1) {
            first();
        } else if (choice == 2) {
            rules();
        } else if (choice == 3) {
            return;
        } else {
            System.out.println("Invalid Choice. ");
            choice();
        }
    }

    static void rules() {
        System.out.println("Each time, a series of target numbers will given, along with 6 smaller numbers. The closer you come to the number, the more points you get. ");
        System.out.println("  Target number: 5 points , 1 away: 4 points , 2 away: 3 points , 3 away: 2 points , 4 away: 1 point :: Score as much as you can in 12 rounds. ");
        System.out.println("Enter anything to return back to main menu.");
        String menu = new Scanner(System.in).nextLine();
        choice();
    }

    static void first() {
        score = 0;
        lastround = 0;
        rounds = 0;
        System.out.println(" Get ready to begin. Score as much as you can in 12 rounds!Get ready...");
        System.out.println("Enter anything to continue.");
        String okj = new Scanner(System.in).nextLine();
        nextq();
    }

    public static void nextq() {
        m = 0;
        int x[] = {10, 25, 50, 75, 100, 6, 7, 8, 9, 10};

        nums[0] = (int) (Math.random() * 7) + 4;
        nums[1] = (int) (Math.random() * 9) + 2;
        nums[2] = (int) (Math.random() * 6) + 5;
        nums[3] = (int) x[(int) (Math.random() * 5)];
        nums[4] = (int) x[(int) (Math.random() * 10)];
        nums[5] = (int) x[(int) (Math.random() * 3) + 2];

        target = (int) (Math.random() * 900) + 100;
        System.out.println("           Round " + (rounds + 1) + ":  ");
        System.out.println("   Your Numbers Are: "
                + nums[5] + "," + nums[4] + "," + nums[3] + ","
                + nums[0] + "," + nums[2] + "," + nums[1] + "."
                + " Your Target Is: " + target);
        another();

    }

    static void another() {
        String s = new Scanner(System.in).nextLine();
        s = s.replace(" ", "");
        if (s.compareTo("S") == 0) {
            System.out.println("You decided to surrender and so you receive " + m + " points. ");
            score = score + m;
            System.out.println("            Current score: " + score);
            lastround = m;
            rounds += 1;
            if (rounds == 12) {
                System.out.print(" You have finished the game and won with the score " + score + ".");
            } else {
                System.out.println("Enter anything to continue.");
                String ax = new Scanner(System.in).nextLine();
                nextq();
            }
        } else if (verify(check(s)) == true) {
            double a = eval(s);
            if (a % 1 != 0) {
                System.out.println("Your expression evaluates to " + a + ". Decimal answers are not allowed. Try again, or type S to submit.");
                another();
            } else if (Math.abs(a - target) <= 4 && Math.abs(a - target) != 0 && 5 - (int) Math.abs(a - target) < m) {
                System.out.println(" Your expression results to " + (int) a + "( " + (int) Math.abs(a - target) + " away ). But you are already " + (5 - m) + " away.");
                System.out.println(" Try again for a better score, or S to submit.");
                another();
            } else if (Math.abs(a - target) <= 4 && Math.abs(a - target) != 0) {
                m = 5 - (int) Math.abs(a - target);
                System.out.println(" Your expression results to " + (int) a + " ( " + (int) Math.abs(a - target) + " number(s) away from the target number), and so you get at least " + m + " points. ");
                System.out.println(" Press S to submit, or try again.");
                another();
            } else if (Math.abs(a - target) == 0) {
                score += 5;
                if (lastround >= 5) {
                    lastround += 1;
                    score = score + lastround - 5;
                } else {
                    lastround = 5;
                }
                if (lastround >= 6) {
                    System.out.println(" For " + (lastround - 5 + 1) + " consecutive target hits, you receive " + (lastround) + " points in this round. ");
                    System.out.println("                Current score: " + score);
                    System.out.println("Enter anything to continue.");
                }

                ++rounds;
                if (lastround == 5) {
                    System.out.println("You guessed target number (" + target + ") correctly and get 5 points!!! ");
                    System.out.println("              Current score: " + score);
                    System.out.println(" Enter anything to continue.");
                }
                String anyt = new Scanner(System.in).nextLine();
                if (rounds != 12) {
                    nextq();
                } else {
                    System.out.print(" You have finished the game and won with the score " + score + ".");
                }
            } else {
                System.out.println(" Your expression evaluates to " + (int) a + " which is out of range. ");
                System.out.println(" Try again.");
                another();
            }
        } else {
            System.out.println(" Invalid numbers or letters used. Try again.");
            another();
        }
    }

    static String check(String x) {

        x = x.replace("(", "#");
        x = x.replace(")", "#");
        x = x.replace("+", "#");
        x = x.replace("-", "#");
        x = x.replace("*", "#");
        x = x.replace("/", "#");
        x = x.replace("^", "#");

        return "#" + x + "#";
    }

    static boolean verify(String x) {
        for (int i = 0; i < nums.length; i++) {
            if (x.contains(String.valueOf(nums[i]) + "#")) {
                x = x.replaceFirst("#" + String.valueOf(nums[i]) + "#", "#");
            }
        }
        for (int i = 0; i < x.length(); i++) {
            if (x.charAt(i) != '#') {
                return false;
            }
        }
        return true;
    }

    public static double eval(final String str) {
        return new Object() {
            int pos = -1, ch;

            void nextChar() {
                ch = (++pos < str.length()) ? str.charAt(pos) : -1;
            }

            boolean eat(int charToEat) {
                while (ch == ' ') {
                    nextChar();
                }
                if (ch == charToEat) {
                    nextChar();
                    return true;
                }
                return false;
            }

            double parse() {
                nextChar();
                double x = parseExpression();
                if (pos < str.length()) {
                    throw new RuntimeException("Unexpected: " + (char) ch);
                }
                return x;
            }

            double parseExpression() {
                double x = parseTerm();
                for (;;) {
                    if (eat('+')) {
                        x += parseTerm(); // addition
                    } else if (eat('-')) {
                        x -= parseTerm(); // subtraction
                    } else {
                        return x;
                    }
                }
            }

            double parseTerm() {
                double x = parseFactor();
                for (;;) {
                    if (eat('*')) {
                        x *= parseFactor(); // multiplication
                    } else if (eat('/')) {
                        x /= parseFactor(); // division
                    } else {
                        return x;
                    }
                }
            }

            double parseFactor() {
                if (eat('+')) {
                    return parseFactor(); // unary plus
                }
                if (eat('-')) {
                    return -parseFactor(); // unary minus
                }
                double x;
                int startPos = this.pos;
                if (eat('(')) { // parentheses
                    x = parseExpression();
                    eat(')');
                } else if ((ch >= '0' && ch <= '9') || ch == '.') { // numbers
                    while ((ch >= '0' && ch <= '9') || ch == '.') {
                        nextChar();
                    }
                    x = Double.parseDouble(str.substring(startPos, this.pos));
                } else if (ch >= 'a' && ch <= 'z') { // functions
                    while (ch >= 'a' && ch <= 'z') {
                        nextChar();
                    }
                    String func = str.substring(startPos, this.pos);
                    x = parseFactor();

                } else {
                    throw new RuntimeException("Unexpected: " + (char) ch);
                }

                if (eat('^')) {
                    x = Math.pow(x, parseFactor()); // exponentiation
                }
                return x;
            }
        }.parse();
    }
}