嗨,我需要帮助,在这里进行计算。在它有单一的行,我想在计算中添加数字,但它只是添加它就像我只是在句子中写数字本身。我如何添加它,就像它的计算,我非常卡住,需要帮助。 (它的最后一行代码)。我也想知道如何限制用户可以输入的字母数量,因为我只希望他们输入' s'或者' m'。我如何才能将它们仅限于这两个所以他们不要使用像#g;'例如,因为那不起作用。
import java.util.Scanner;
public class FedTaxRate
{
public static void main(String[] args)
{
String maritalStatus;
double income;
int single = 32000;
int married = 64000;
Scanner status = new Scanner(System.in);
System.out.println ("Please enter your marital status: ");
maritalStatus = status.next();
Scanner amount = new Scanner(System.in);
System.out.print ("Please enter your income: ");
income = amount.nextDouble();
if (maritalStatus.equals("s") && income <= 32000 )
{
System.out.println ("The tax is " + income * 0.10 + ".");
}
else if (maritalStatus.equals("s") && income > 32000)
{
System.out.println ("The tax is " + (income - 32000) * 0.25 + single + ".");
}
}
}
答案 0 :(得分:1)
要回答关于限制输入的第二个问题,您可以尝试使用switch case语句。当default
不等于maritalStatus
或"s"
时,"m"
允许您为案例编写代码。您还可以创建一个do-while循环,以便在maritalStatus
等于"s"
或"m"
之前继续询问输入。
Scanner status = new Scanner(System.in);
String maritalStatus = status.nextLine();
do {
System.out.println("Enter your marital status.")
switch (maritalStatus) {
case "s":
// your code here
break;
case "m":
// your code here
break;
default:
// here you specify what happens when maritalStatus is not "s" or "m"
System.out.println("Try again.");
break;
}
// loop while maritalStatus is not equal to "s" or "m"
} while (!("s".equalsIgnoreCase(maritalStatus)) &&
!("m".equalsIgnoreCase(maritalStatus)));
答案 1 :(得分:0)
您只需要一个Scanner
。您可以在else
测试中使用income
。我建议你计算一次tax
,然后用格式化的IO显示它。像,
public static void main(String[] args) {
int single = 32000;
int married = 64000;
Scanner sc = new Scanner(System.in);
System.out.println("Please enter your marital status: ");
String maritalStatus = sc.next();
System.out.print("Please enter your income: ");
double income = sc.nextDouble();
double tax;
if ("s".equalsIgnoreCase(maritalStatus)) {
if (income <= single) {
tax = income * 0.10;
} else {
tax = (income - single) * 0.25 + single;
}
} else {
if (income <= married) {
tax = income * 0.10;
} else {
tax = (income - married) * 0.25 + married;
}
}
System.out.printf("The tax is %.2f.%n", tax);
}