該程序提取數字，我希望它一直循環直到用戶鍵入鍵“Q”/“q”。例如，當用戶按下“O”鍵時，程序應該打印他們輸入的數字的個位數字，對于用戶輸入的任何 3 位數字，依此類推。當我現在運行代碼時，沒有輸出，但也沒有錯誤。import java.util.Scanner;public class DigitExtractor { public static void main(String[] args) throws java.io.IOException{ char input; input = (char) System.in.read(); Scanner s = new Scanner(System.in); variables Num = new variables(); do { System.out.print("Enter an integer: "); String wholeNumber = s.nextLine(); Num.ones = wholeNumber.charAt(2); Num.tens = wholeNumber.charAt(1); Num.hundred = wholeNumber.charAt(0); System.out.println("show (W)hole number."); System.out.println("show (O)nes place number."); System.out.println("show (T)ens place number."); System.out.println("show (H)undreds place number."); input = (char) System.in.read(); System.out.println("Enter your choice: " + input); if(input == 'W' || input == 'w') { System.out.println(Num.WholeNum); } else if(input == 'O' || input == 'o') { System.out.println(Num.ones); } else if(input == 'T' || input == 't') { System.out.println(Num.tens); } else if(input == 'H' || input == 'H') { System.out.println(Num.hundred); } } while (input == 'q'); }}class variables { char hundred; char tens; char ones; char WholeNum;}
1 回答
牛魔王的故事
TA貢獻1830條經驗 獲得超3個贊
閱讀越來越混亂。要使用掃描儀讀取整數，我選擇了 nextInt。那有幫助。我采用了您不將事情分解成更小塊的方法。并且（修訂版）我只使用掃描儀進行閱讀，甚至是供選擇的字符。我還在你不得不按下選項之前給出了提示，這樣你就會知道。
public static void main(String[] args)
throws java.io.IOException {
int hundred; //my compiler was fussy about having the extra class
int tens;
int ones;
char input = ' '; //initialize outside loop
Scanner s = new Scanner(System.in);
do {
System.out.print("Enter an integer: ");
int wholeNumber = s.nextInt();
ones = wholeNumber % 10;
tens = (wholeNumber / 10) % 10;
hundred = (wholeNumber / 100) % 10;
System.out.println("show (W)hole number.");
System.out.println("show (O)nes place number.");
System.out.println("show (T)ens place number.");
System.out.println("show (H)undreds place number.");
System.out.println("(Q)uit");
System.out.print("Enter your choice: ");
input = s.next().trim().charAt(0); //using scanner only
//System.out.println("Enter your choice: " + input);
if (input == 'W' || input == 'w') {
System.out.println(wholeNumber);
} else if (input == 'O' || input == 'o') {
System.out.println(ones);
} else if (input == 'T' || input == 't') {
System.out.println(tens);
} else if (input == 'H' || input == 'H') {
System.out.println(hundred);
}
} while ((input != 'q') && (input != 'Q'));
}
}
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