0
好的，謝謝，我已經計算出了退出循環。程序結束時出現循環問題，無法退出
現在我的問題是，我試圖測試int newScore，以確保其值在1和100之間。該循環的一半工作。如果我在參數外輸入一個值，它會循環並再次請求它。然而，當我在參數中輸入一個值時，它不會打破循環並繼續到程序的下一部分（要麼提出下一個測試分數，要麼計算平均值，如果沒有更多分數）這是我更新的代碼試試這個循環：
do {
while (scoreValid) {
while (tv) {
try {
System.out.println("Please enter test score # " + counter);
newScore = Integer.parseInt(scan.nextLine());
if (newScore >= 1 && newScore <= 100) {
scoreValid = true;
tv = false;
counter++;
totalScore = totalScore + newScore;
break;
} else {
System.out.println("Sorry, you must enter a number between 1 and 100.");
tv = true;
continue;
}
} catch (Exception e) {
System.out.println("Sorry, I didn't catch that");
continue;
}
}
}
} while (counter <= numberTests);這裏是原代碼....
/**
* This app will average test scores and tell you what letter grade you received.
*
* @jordan.hawkes
* @1.0
*/
import java.util.Scanner;
public class TestScoreCalculator {
public static void main(String[] args) {
String first; // First Name entered by user
String last; // Last Name entered by user
String newTestAnswer; // answer for entering another test score
String redoAnswer; // answer to rerun program
int avg; // Average test score
int totalScore = 0; // Total Running Test Score
int newScore; // Test Score Entered by User
int counter = 1; // Number of Scores Entered
int testNumber; // Test # counter
int numberTests = 0; // Number of Tests entered by user
boolean scoreValid = false; // boolean to validate score
boolean newTest = false; // boolean to validate entering another test
boolean redo = false; // boolean to rerun program
boolean numberTestsValid = false; // boolean to validate number of tests
boolean test = false; // test boolean to validate exit/rerun
Scanner scan = new Scanner(System.in);
System.out.print("Please enter your first name: ");
first = scan.nextLine();
System.out.print("Hello, " + first + ", please enter your last name: ");
last = scan.nextLine();
while (redo = true) {
while (numberTestsValid = true) {
try {
System.out.println("Thanks, " + first + ", how many test scores would you like to enter? ");
numberTests = Integer.parseInt(scan.nextLine());
numberTestsValid = true;
break;
} catch (Exception e) {
System.out.println("Sorry, I didn't catch that");
continue;
}
}
do {
while (scoreValid = true) {
try {
System.out.println("Great, please enter test score # " + counter);
newScore = Integer.parseInt(scan.nextLine());
scoreValid = true;
counter++;
totalScore = totalScore + newScore;
break;
} catch (Exception e) {
System.out.println("Sorry, I didn't catch that");
continue;
}
}
} while (counter <= numberTests);
testNumber = counter - 1;
avg = (totalScore/testNumber);
switch (avg/10) {
case 10:
System.out.println("Congratulations " + first.charAt(0) + ". " + last + ", you got an A+!");
break;
case 9:
System.out.println("Congratulations " + first.charAt(0) + ". " + last + ", you got an A!");
break;
case 8:
System.out.println("Congratulations " + first.charAt(0) + ". " + last + ", you got a B!");
break;
case 7:
System.out.println("Congratulations " + first.charAt(0) + ". " + last + ", you got a C!");
break;
case 6:
System.out.println("Congratulations " + first.charAt(0) + ". " + last + ", you got a D!");
break;
default:
System.out.println("Congratulations " + first.charAt(0) + ". " + last + ", you got an F!");
}
while (test = true) {
System.out.println("type r to restart or q to quit");
redoAnswer = scan.nextLine().trim().toLowerCase();
if (redoAnswer.equals("r")) {
test = false;
totalScore = 0;
counter = 1;
redo = true;
break;
} else if (redoAnswer.equals("q")) {
test = false;
redo = false;
System.out.println("Goodbye!");
continue;
} else {
System.out.println("Sorry, I didn't catch that. Please type r to restart or q to quit");
continue;
}
}
}
} //end main
} //end class
哦，非常感謝你，哇，不知道我是如何錯過了，但我很感激它，並改變了所有的循環條件！感謝您的解釋，所以我不知道未來會這樣做。 我有另一個問題，我想知道... 所以當我要求用戶輸入測試分數，然後我解析答案，以確保它是一個int，有沒有辦法設置他們可以輸入的值的邊界？例如，在測試分數中，我只想要1到100之間的答案。 –
解析它，然後測試它，也許'scoreValid = newScore> 0 && newScore <101'或其他。 – Bohemian