结束 while 循环的问题
Issue with ending a while loop
我试图让程序在总数达到 10 时结束，但出于某种原因，我的 while 循环在达到 10 时继续计数。我有 int percent 可以在回答 10 个问题后找到百分比。
import java.util.*;
class蔡{
私有静态扫描仪输入；
public static void main(String[] arguments) {
menu();// calls menu method
compute();// calls compute method
}
public static void menu() {// method that displays menu
System.out.println(" CAI MENU ");
System.out.println("\n)");
System.out
.println("\n1) DIFFICULTY 1\n2) DIFFICULTY 2\n3) DIFFICULTY 3\n4) DIFFICULTY 4");
}
public static int[] Blop() {
Random rand = new Random();
int arr[] = new int[8];
arr[0] = rand.nextInt(9);
arr[1] = rand.nextInt(9);
arr[2] = rand.nextInt(99);
arr[3] = rand.nextInt(99);
arr[4] = rand.nextInt(999);
arr[5] = rand.nextInt(999);
arr[6] = rand.nextInt(9999);
arr[7] = rand.nextInt(9999);
return arr;
}
public static void compute() {
int difficulty;
input = new Scanner(System.in);
System.out.println("Enter an option: ");
difficulty = input.nextInt();
int total = 0;
int percent = 0;
while (total <= 10) {
if (difficulty == 1) {
int num[] = new int[2];
int ans;
String choice;
do {
num = Blop();
do {
System.out.print("How much is " + num[0] + " times "
+ num[1] + " ? :");
total++;
System.out.print(total);
ans = input.nextInt();
String Correct;
String Wrong;
String[] correct = { "Very good! ", "Excellent! ",
"Nice work! ", "Keep up the good work! " };
String[] wrong = { "No. Please try again. ",
"Wrong. Try once more. ", "Don’t give up! ",
"No. Keep trying " };
Random rand = new Random();
Correct = correct[rand.nextInt(correct.length)];
Wrong = wrong[rand.nextInt(wrong.length)];
if (ans == (num[0] * num[1])) {
System.out.print(Correct);
percent++;
} else {
System.out.print(Wrong);
}
} while (ans != (num[0] * num[1]));
System.out.print("Do you want more questions(yes/no) :");
input.nextLine();
choice = input.nextLine();
} while (choice.equalsIgnoreCase("yes"));
}
}
if (difficulty == 2) {
int num[] = new int[2];
int ans;
String choice;
do {
num = Blop();
do {
System.out.print("How much is " + num[2] + " times "
+ num[3] + " ? :");
ans = input.nextInt();
String Correct;
String Wrong;
String[] correct = { "Very good! ", "Excellent! ",
"Nice work! ", "Keep up the good work! " };
String[] wrong = { "No. Please try again. ",
"Wrong. Try once more. ", "Don’t give up! ",
"No. Keep trying " };
Random rand = new Random();
Correct = correct[rand.nextInt(correct.length)];
Wrong = wrong[rand.nextInt(wrong.length)];
if (ans == (num[2] * num[3])) {
System.out.print(Correct);
} else {
System.out.print(Wrong);
}
} while (ans != (num[2] * num[3]));
System.out.print("Do you want more questions(yes/no) :");
input.nextLine();
choice = input.nextLine();
} while (choice.equalsIgnoreCase("yes"));
}
if (difficulty == 3) {
int num[] = new int[2];
int ans;
String choice;
do {
num = Blop();
do {
System.out.print("How much is " + num[4] + " times "
+ num[5] + " ? :");
ans = input.nextInt();
String Correct;
String Wrong;
String[] correct = { "Very good! ", "Excellent! ",
"Nice work! ", "Keep up the good work! " };
String[] wrong = { "No. Please try again. ",
"Wrong. Try once more. ", "Don’t give up! ",
"No. Keep trying " };
Random rand = new Random();
Correct = correct[rand.nextInt(correct.length)];
Wrong = wrong[rand.nextInt(wrong.length)];
if (ans == (num[4] * num[5])) {
System.out.print(Correct);
} else {
System.out.print(Wrong);
}
} while (ans != (num[4] * num[5]));
System.out.print("Do you want more questions(yes/no) :");
input.nextLine();
choice = input.nextLine();
} while (choice.equalsIgnoreCase("yes"));
}
if (difficulty == 4) {
int num[] = new int[2];
int ans;
String choice;
do {
num = Blop();
do {
System.out.print("How much is " + num[6] + " times "
+ num[7] + " ? :");
ans = input.nextInt();
String Correct;
String Wrong;
String[] correct = { "Very good! ", "Excellent! ",
"Nice work! ", "Keep up the good work! " };
String[] wrong = { "No. Please try again. ",
"Wrong. Try once more. ", "Don’t give up! ",
"No. Keep trying " };
Random rand = new Random();
Correct = correct[rand.nextInt(correct.length)];
Wrong = wrong[rand.nextInt(wrong.length)];
if (ans == (num[6] * num[7])) {
System.out.print(Correct);
} else {
System.out.print(Wrong);
}
} while (ans != (num[6] * num[7]));
System.out.print("Do you want more questions(yes/no) :");
input.nextLine();
choice = input.nextLine();
} while (choice.equalsIgnoreCase("yes"));
}
System.out.print(100 / 10 * percent);
}
}
您的 while 循环已声明：
"while total is less than or equal to ten"
这意味着它将在 10 点再次 运行。
总计<10
编辑：您也不会在任何地方增加总数。
total++;
会做到的。
编辑：看来你做到了。抱歉，代码很难在 phone 上阅读。
发生这种情况可能有多种原因。其中一个原因是，如果变量 difficulty 不等于 one（在您的代码中也找不到该变量），那么 total 将永远不会递增，因此第一个 while 循环将永远持续下去。因为您没有共享所有代码，所以 ans != (num[0] * num[1] 也可能永远不会为真，因此最内层的 do/while 循环将永远执行。如果您 post 剩下的代码，我们将能够为您提供更多帮助。
编辑：好的，谢谢。看起来您的问题是由于这样一个事实，即当用户继续错误地回答问题时，他们无法逃脱内部 while 循环，因此无法逃脱外部 while 循环。解决这个问题的方法很简单，只需将 while (ans != (num[4] * num[5])); 更改为 ans != (num[0] * num[1]) && total < 10，从而让代码在用户答错问题时逃脱。
我试图让程序在总数达到 10 时结束，但出于某种原因，我的 while 循环在达到 10 时继续计数。我有 int percent 可以在回答 10 个问题后找到百分比。
import java.util.*;
class蔡{ 私有静态扫描仪输入；
public static void main(String[] arguments) {
menu();// calls menu method
compute();// calls compute method
}
public static void menu() {// method that displays menu
System.out.println(" CAI MENU ");
System.out.println("\n)");
System.out
.println("\n1) DIFFICULTY 1\n2) DIFFICULTY 2\n3) DIFFICULTY 3\n4) DIFFICULTY 4");
}
public static int[] Blop() {
Random rand = new Random();
int arr[] = new int[8];
arr[0] = rand.nextInt(9);
arr[1] = rand.nextInt(9);
arr[2] = rand.nextInt(99);
arr[3] = rand.nextInt(99);
arr[4] = rand.nextInt(999);
arr[5] = rand.nextInt(999);
arr[6] = rand.nextInt(9999);
arr[7] = rand.nextInt(9999);
return arr;
}
public static void compute() {
int difficulty;
input = new Scanner(System.in);
System.out.println("Enter an option: ");
difficulty = input.nextInt();
int total = 0;
int percent = 0;
while (total <= 10) {
if (difficulty == 1) {
int num[] = new int[2];
int ans;
String choice;
do {
num = Blop();
do {
System.out.print("How much is " + num[0] + " times "
+ num[1] + " ? :");
total++;
System.out.print(total);
ans = input.nextInt();
String Correct;
String Wrong;
String[] correct = { "Very good! ", "Excellent! ",
"Nice work! ", "Keep up the good work! " };
String[] wrong = { "No. Please try again. ",
"Wrong. Try once more. ", "Don’t give up! ",
"No. Keep trying " };
Random rand = new Random();
Correct = correct[rand.nextInt(correct.length)];
Wrong = wrong[rand.nextInt(wrong.length)];
if (ans == (num[0] * num[1])) {
System.out.print(Correct);
percent++;
} else {
System.out.print(Wrong);
}
} while (ans != (num[0] * num[1]));
System.out.print("Do you want more questions(yes/no) :");
input.nextLine();
choice = input.nextLine();
} while (choice.equalsIgnoreCase("yes"));
}
}
if (difficulty == 2) {
int num[] = new int[2];
int ans;
String choice;
do {
num = Blop();
do {
System.out.print("How much is " + num[2] + " times "
+ num[3] + " ? :");
ans = input.nextInt();
String Correct;
String Wrong;
String[] correct = { "Very good! ", "Excellent! ",
"Nice work! ", "Keep up the good work! " };
String[] wrong = { "No. Please try again. ",
"Wrong. Try once more. ", "Don’t give up! ",
"No. Keep trying " };
Random rand = new Random();
Correct = correct[rand.nextInt(correct.length)];
Wrong = wrong[rand.nextInt(wrong.length)];
if (ans == (num[2] * num[3])) {
System.out.print(Correct);
} else {
System.out.print(Wrong);
}
} while (ans != (num[2] * num[3]));
System.out.print("Do you want more questions(yes/no) :");
input.nextLine();
choice = input.nextLine();
} while (choice.equalsIgnoreCase("yes"));
}
if (difficulty == 3) {
int num[] = new int[2];
int ans;
String choice;
do {
num = Blop();
do {
System.out.print("How much is " + num[4] + " times "
+ num[5] + " ? :");
ans = input.nextInt();
String Correct;
String Wrong;
String[] correct = { "Very good! ", "Excellent! ",
"Nice work! ", "Keep up the good work! " };
String[] wrong = { "No. Please try again. ",
"Wrong. Try once more. ", "Don’t give up! ",
"No. Keep trying " };
Random rand = new Random();
Correct = correct[rand.nextInt(correct.length)];
Wrong = wrong[rand.nextInt(wrong.length)];
if (ans == (num[4] * num[5])) {
System.out.print(Correct);
} else {
System.out.print(Wrong);
}
} while (ans != (num[4] * num[5]));
System.out.print("Do you want more questions(yes/no) :");
input.nextLine();
choice = input.nextLine();
} while (choice.equalsIgnoreCase("yes"));
}
if (difficulty == 4) {
int num[] = new int[2];
int ans;
String choice;
do {
num = Blop();
do {
System.out.print("How much is " + num[6] + " times "
+ num[7] + " ? :");
ans = input.nextInt();
String Correct;
String Wrong;
String[] correct = { "Very good! ", "Excellent! ",
"Nice work! ", "Keep up the good work! " };
String[] wrong = { "No. Please try again. ",
"Wrong. Try once more. ", "Don’t give up! ",
"No. Keep trying " };
Random rand = new Random();
Correct = correct[rand.nextInt(correct.length)];
Wrong = wrong[rand.nextInt(wrong.length)];
if (ans == (num[6] * num[7])) {
System.out.print(Correct);
} else {
System.out.print(Wrong);
}
} while (ans != (num[6] * num[7]));
System.out.print("Do you want more questions(yes/no) :");
input.nextLine();
choice = input.nextLine();
} while (choice.equalsIgnoreCase("yes"));
}
System.out.print(100 / 10 * percent);
}
}
您的 while 循环已声明： "while total is less than or equal to ten"
这意味着它将在 10 点再次 运行。
总计<10
编辑：您也不会在任何地方增加总数。
total++;
会做到的。
编辑：看来你做到了。抱歉，代码很难在 phone 上阅读。
发生这种情况可能有多种原因。其中一个原因是，如果变量 difficulty 不等于 one（在您的代码中也找不到该变量），那么 total 将永远不会递增，因此第一个 while 循环将永远持续下去。因为您没有共享所有代码，所以 ans != (num[0] * num[1] 也可能永远不会为真，因此最内层的 do/while 循环将永远执行。如果您 post 剩下的代码，我们将能够为您提供更多帮助。
编辑：好的，谢谢。看起来您的问题是由于这样一个事实，即当用户继续错误地回答问题时，他们无法逃脱内部 while 循环，因此无法逃脱外部 while 循环。解决这个问题的方法很简单，只需将 while (ans != (num[4] * num[5])); 更改为 ans != (num[0] * num[1]) && total < 10，从而让代码在用户答错问题时逃脱。