问题从if语句开始（“你本月申请住房津贴津贴吗？是/否”）; 从用户那里得到答案后，应用程序仍然会再次循环。
为什么我的if / else不退出循环？ 我的所有逻辑都没问题，除了if语句根本不会破坏 我试图使用break语句跳转if / else并从无限运行中停止代码，但它也没有用。
我错过了什么？
public static void main(String[] args) {
double basic_salary, tax, KWSP, housing_allowance, holder;
Scanner scan = new Scanner(System.in);
String answer = null;
System.out.println("Enter Basic Salary Of Employee: ");
basic_salary = scan.nextDouble();
do {
if (basic_salary <= 6000 && basic_salary >= 1) {
tax = 0.10 * basic_salary;
System.out.println("The compulsory tax = " + tax + " $");
housing_allowance = 0.5 * basic_salary;
} else if (basic_salary >= 6001 && basic_salary <= 10000) {
tax = 0.20 * basic_salary;
System.out.println("The compulsory tax = " + tax + " $");
housing_allowance = 0.5 * basic_salary;;
} else if (basic_salary >= 10001 && basic_salary <= 14000) {
tax = 0.25 * basic_salary;
System.out.println("The compulsory tax = " + tax + " $");
housing_allowance = 0.3 * basic_salary;;
} else {
tax = 0.30 * basic_salary;
System.out.println("The compulsory tax = " + tax + " $");
housing_allowance = 0.3 * basic_salary;;
}
System.out.println("Type the amount For KWSP contribution 11% or 13% ONLY");
KWSP = scan.nextDouble();
holder = KWSP / 100;
KWSP = holder * basic_salary;
System.out.println("KWSP contribution= " + KWSP + " $");
Scanner input = new Scanner(System.in);
System.out.println("Did you apply for Housing Allowance allowance for this month? yes/no");
answer = input.nextLine();
if (answer.equalsIgnoreCase("yes")) {
System.out.println("");
System.out.println("");
System.out.println("Housing Allowance: " + housing_allowance + " $");
System.out.println("KWSP:contribution: " + KWSP + " $");
System.out.println("Tax:contribution : " + housing_allowance + " $");
System.out.println("Gross Salary Of Employee: " + (KWSP + housing_allowance + tax) + " $");
System.out.println("");
System.out.println("");
} else if (answer.equalsIgnoreCase("no")) {
System.out.println("");
System.out.println("");
System.out.println("KWSP:contribution: " + KWSP + " $");
System.out.println("Tax:contribution : " + housing_allowance + " $");
System.out.println("Gross Salary Of Employee: " + (KWSP + tax) + " /n");
System.out.println("");
System.out.println("");
} else {
break;
}
} while (basic_salary > 0); //while loop
System.out.println("salary cannot be Zero or Negative");
}
}
答案 0 :(得分：1)
您正在输入basic_salary然后运行do-while循环直到basic_salary > 0而不是在任何地方修改basic_salary
此条件不会变为false，直到用户输入0或某些负值本身。
我不确定你想要实现什么，你的逻辑是什么。 如果你想在计算后简单地打印消息，那么你可以使用简单的if-else条件而不是do-while循环。
也许是这样的：
if (basic_salary > 0) {
//do your calculation and printing here
} else {
//print basic_salary less than 0 error message
System.out.println("salary cannot be Zero or Negative");
}
答案 1 :(得分：0)
查看你的while语句，似乎你想在工资为！= 0时打破循环。
所以你可以改变你的状况：
while !(basic_salary > 0); //while loop
也许可以在循环开始时写下System.out.println。
System.out.println("salary cannot be Zero or Negative");
答案 2 :(得分：0)
我编辑了你的代码，现在它可以正常工作了。但是，不要盲目地使用它，尝试阅读它并理解它为什么起作用。 检查并提出进一步的问题，如果有的话。
public static void main(String[] args) {
double basic_salary, tax, KWSP, housing_allowance, holder;
Scanner scan = new Scanner(System.in);
String answer;
do {
System.out.println("Enter Basic Salary Of Employee: ");
basic_salary = scan.nextDouble();
if (basic_salary <= 0) {
housing_allowance = 0;
tax = 0;
System.out.println("salary cannot be Zero or Negative");
} else if (basic_salary <= 6000 && basic_salary >= 1) {
tax = 0.10 * basic_salary;
System.out.println("The compulsory tax = " + tax + " $");
housing_allowance = 0.5 * basic_salary;
} else if (basic_salary >= 6001 && basic_salary <= 10000) {
tax = 0.20 * basic_salary;
System.out.println("The compulsory tax = " + tax + " $");
housing_allowance = 0.5 * basic_salary;
} else if (basic_salary >= 10001 && basic_salary <= 14000) {
tax = 0.25 * basic_salary;
System.out.println("The compulsory tax = " + tax + " $");
housing_allowance = 0.3 * basic_salary;
} else {
tax = 0.30 * basic_salary;
System.out.println("The compulsory tax = " + tax + " $");
housing_allowance = 0.3 * basic_salary;
}
}
while (basic_salary <= 0);
do {
System.out.println("Type the amount For KWSP contribution 11% or 13% ONLY");
KWSP = scan.nextDouble();
}
while (!(KWSP == 11 || KWSP == 13));
holder = KWSP / 100;
KWSP = holder * basic_salary;
System.out.println("KWSP contribution= " + KWSP + " $");
do {
System.out.println("Did you apply for Housing Allowance allowance for this month? yes/no");
answer = scan.next();
}
while (!(answer.equals("yes") || answer.equals("no"))) ;
if (answer.equalsIgnoreCase("yes")) {
System.out.println("");
System.out.println("");
System.out.println("Housing Allowance: " + housing_allowance + " $");
System.out.println("KWSP:contribution: " + KWSP + " $");
System.out.println("Tax:contribution : " + housing_allowance + " $");
System.out.println("Gross Salary Of Employee: " + (KWSP + housing_allowance + tax) + " $");
System.out.println("");
System.out.println("");
} else if (answer.equalsIgnoreCase("no")) {
System.out.println("");
System.out.println("");
System.out.println("KWSP:contribution: " + KWSP + " $");
System.out.println("Tax:contribution : " + housing_allowance + " $");
System.out.println("Gross Salary Of Employee: " + (KWSP + tax) + " /n");
System.out.println("");
System.out.println("");
}
}