[英]“while loop” in Letter Guessing game Java
我正在嘗試制作字母猜謎游戲,其中用戶需要猜測 A - Z 之間的字母,如果猜出的字母不正確,則表示該字母高於或低於猜測的字母。 我做了一個代碼,它可以正確執行,但我不能添加循環,它會重復代碼,直到用戶猜出正確的字母。 我是新手,所以一些解釋和幫助會非常好。
這是我的代碼:
import java.util.Scanner;
public class GuessTheLetter {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
System.out.println("Guess the Letter");
String myLetter = scan.nextLine();
char enteredLetter = Character.toUpperCase(myLetter.charAt(0));
int[] range = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26 };
char[] characters = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R',
'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z' };
char randomLetter = characters[(int) (Math.random() * 26)];
int userInputToInt = 0;
int userInputControlLoop = 0;
int computerInputToInt = 0;
for (int i = 0; i < characters.length; ++i) {
if (randomLetter == characters[i]) {
computerInputToInt = range[i];
}
}
for (char i : characters) {
if (enteredLetter == i) {
userInputToInt = range[userInputControlLoop];
}
++userInputControlLoop;
}
if (enteredLetter == randomLetter) {
System.out.println("Correct Guess");
System.out.println("The letter is:" + randomLetter);
}
else if (userInputToInt > computerInputToInt) {
System.out.println("Incorrect Guess");
System.out.println("The letter is too high");
System.out.println("The letter is:" + randomLetter);
}
else if (userInputToInt < computerInputToInt) {
System.out.println("Incorrect Guess");
System.out.println("The letter is too low");
System.out.println("The letter is:" + randomLetter);
scan.close();
}
}
}
這就是你想要的:
import java.util.Scanner;
public class GuessTheLetter {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
System.out.println("Guess the Letter:-\n");
char randomLetter = (char) (Math.random() * 26 + 65); // logic to generate random letter
char enteredLetter = 0; // initializing variable to store entered letter
while (true) {// infinite loop till correct guess
System.out.print("\nEnter your Guess : ");
enteredLetter = Character.toUpperCase(scan.next().charAt(0)); // emter letter
if (enteredLetter == randomLetter) {
System.out.println("Correct Guess");
System.out.println("The letter is:" + randomLetter);
break;// exit loop if correct letter is guessed
} else if (enteredLetter > randomLetter) // we can directly compare char like int
{
System.out.println("Incorrect Guess");
System.out.println("The letter entered is too high");
}
else if (enteredLetter < randomLetter) // we can directly compare char like int
{
System.out.println("Incorrect Guess");
System.out.println("The letter entered is too low");
}
}
scan.close();
}
}
解釋在程序的評論中!
這是帶有此 Boolean 變量的更新代碼,就像在提到的評論部分中一樣。
但是您還必須考慮可能添加一個 try / catch / finally 塊,然后在 finally 塊部分關閉您的掃描儀(最終將始終被調用)
因為您現在循環,直到您有正確的猜測,您必須在循環之外創建隨機變量,否則它將在每次迭代中創建一個新的隨機字符。
我也擺脫了這些控制循環,實際上使用 char 的一大好處是你可以將 ASCII 值與其他字符進行比較。
這里我們只是比較大寫的字符,我們可以直接比較這些字符,例如enteredLetter > randomLetter
。
例子:
enteredLetter = 'A';
randomLetter = 'D';
enteredLetter > randomLetter
此比較將檢查 ASCII值 A=65 > D=69 SO A 不大於 D 和 go 到下一個條件。
此外,您應該使用 Characters 檢查有效輸入,方式應該是 class 字符isLetter()的 static 方法。 也不要將輸入作為字符串,而是將輸入直接作為字符使用char myLetter = scan.next().charAt(0);
package hall;
import java.util.Scanner;
public class GuessingGame {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
Boolean isGuessed = false;
char[] characters = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q',
'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z' };
char randomLetter = characters[(int) (Math.random() * 26)];
while (!isGuessed) {
System.out.println("Guess the Letter");
char myLetter = scan.next().charAt(0);
if(!(Character.isLetter(myLetter))) {
System.out.println("Invalid Input Try Again:");
}else {
char enteredLetter = Character.toUpperCase(myLetter);
if (enteredLetter == randomLetter) {
System.out.println("Correct Guess");
System.out.println("The letter is:" + randomLetter);
isGuessed = true;
}
else if (enteredLetter > randomLetter) {
System.out.println("Incorrect Guess");
System.out.println("The letter is too high");
}
else if (enteredLetter < randomLetter) {
System.out.println(enteredLetter);
System.out.println("Incorrect Guess");
System.out.println("The letter is too low");
}
}
}
}
}
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