猜數字小游戲

猜數字小游戲

import java.util.Scanner;

public class numberGame {
    public static void main(String[] args) {
        //小練習，用于生成大于0.5的亂數
        /*
        double randNum = 0;
        //生成一個大于0.5的亂數，只有亂數大于0.5，程式的回圈才會退出

        while (randNum < 0.5) {
            //使用Java中的Math.random生成亂數
            randNum = Math.random();
            System.out.println(randNum);
        }
        System.out.println("生成的大于0.5的亂數是" + randNum);

         */

        boolean startGame = true;
        int correctGuessTotal = 0;
        int totalGameCount = 0;
        //使用while回圈確定開始游戲
        while (startGame) {
            //使用輸入函式
            Scanner in = new Scanner(System.in);
            //定義猜數范圍
            int rangeStart = 30;
            int rangEnd = 50;
            //設定允許猜測次數每次游戲
            int guessTotal = 5;

            int mod = rangEnd - rangeStart;
            //檢驗猜數開始值和結束值是否為0
            if (rangeStart < 0 || rangEnd < 0) {
                System.out.println("開始值和結束值不可為0");
            }
            //用兩數之模檢驗兩數之間可以生成大于等于1個亂數
            if (mod <= 1) {
                System.out.println("非法的數字范圍：（" + rangeStart + "," + rangEnd + "）");
            }

            //生成亂數

            int bigRandom = (int) (Math.random() * (rangEnd * 100));

            int numberToGuess = (bigRandom % mod) + rangeStart;
            //檢驗目標數字不小于或大于起始值和結束值，否則置為起始值加一或者結束值減一
            if (numberToGuess <= rangeStart) {
                numberToGuess = rangeStart + 1;
            } else if (numberToGuess > rangEnd) {
                numberToGuess = rangEnd - 1;
            }

            //下行注釋用于檢測程式使用，得出目標值numberToGuess
            //System.out.println("mod=" + mod + "\t" + "bigRandom=" + bigRandom + "\tnumberToGues=" + numberToGuess);

            int leftGuess = guessTotal;
            //定義初始正確猜測布林值為false
            boolean correctGuess = false;

            System.out.println("請輸入猜測數字，范圍是【" + rangeStart + "," + rangEnd + "）");

            //游戲主體
            while (leftGuess > 0) {

                System.out.println("請輸入猜測數字，剩余猜測次數為：" + leftGuess + "，如需退出游戲請輸入“-1”");

                int guess = in.nextInt();

                //檢測到負數，退出游戲主體
                if (guess < 0) {
                    System.out.println("用戶選擇退出游戲！");
                    //游戲進行次數統計放在了后面，導致-1退出也計算游戲次數，通過自減操作抵消回圈外多余的自增操作
                    totalGameCount--;

                    //如果已經猜測了幾個，在五次之前不想繼續猜了，也統計總共游戲次數
                    if (leftGuess < 4) {
                        totalGameCount++;
                    }
                    break;
                }

                //進行到此步游戲正式開始，開始計算剩余次數，剩余次數減一
                leftGuess--;


                //輸入的數字超出范圍哦，重新開始游戲主體回圈
                if (guess < rangeStart || guess > rangEnd) {
                    System.out.println("請輸入范圍在【" + rangeStart + "," + rangEnd + "）內的數字！");
                    continue;
                }

                //判斷給出數字和目標數字
                if (guess == numberToGuess) {
                    System.out.println("恭喜猜對了！");
                    //猜對數字，正確猜測布林值職位true，并對正確猜測次數加一
                    correctGuess = true;
                    correctGuessTotal++;
                    break;
                } else if (guess > numberToGuess) {
                    System.out.println("待猜數字小于" + guess);
                } else {
                    System.out.println("待猜數字大于" + guess);
                }

            }

            //游戲次數統計，每回圈一次游戲主體，游戲次數加一
            totalGameCount++;

            //正確猜測未經過重新賦值認為false，！correctGuess為true，執行本回圈，告知猜測失敗和真實數字
            if (!correctGuess) {
                System.out.println("本局猜測失敗，猜測數字實際為：" + numberToGuess);
            }

            System.out.println("游戲結束！是否繼續游戲？true/false");


            //通過獲取到的布林值來為游戲是否開始賦值
            startGame = in.nextBoolean();


        }
        System.out.println("本局游戲一共進行了" + totalGameCount + "次，" + "其中正確猜對" + correctGuessTotal + "次");
    }
}