我是Java的新手，我已经为我的中级课做了一个作业。它应该提示用户提供信息，然后将其显示在表格中。该程序按预期工作，除非提示回答＆＃34; y或n＆＃34;，如果回答除了＆＃34; y＆＃34;它无限循环。 import java.util.Scanner;
public class InterestCalculator
{
public static void main(String[] args)
{
Scanner userInput = new Scanner(System.in);
double startingBalance;
double interestRate;
double endingBalance;
double interestEarned;
char yesOrNo;
int temp;
int numberOfQuarters;
while(true)
{
System.out.println("Enter number of quarters from 1 to 10");
numberOfQuarters = userInput.nextInt();
if (numberOfQuarters > 0 && numberOfQuarters <=10)
{
break;
}
else
{
System.out.println("Number of quarters must be between 1 and 10 inclusive");
}
}
while(true)
{
System.out.println("Enter the beginning principal balance greater than zero");
startingBalance = userInput.nextDouble();
if (startingBalance > 0)
{
break;
}
else
{
System.out.println("Beginning balance must be greater than zero");
}
}
while(true)
{
System.out.println("Enter the interest rate percentage without the percent sign, greater than 0 percent and less than/equal to 20%"
);
interestRate = userInput.nextDouble();
if (interestRate > 0 && interestRate <= 20)
{
break;
}
else
{
System.out.println("Interest rate must be between 1 and 20 inclusive");
}
}
System.out.println("You entered a principal balance of $" + startingBalance + " for " + numberOfQuarters + " quarters at " + interestRate + "% interest.");
System.out.println("Is this correct? (y/n)");
yesOrNo = userInput.next().charAt(0);
while(true)
{
if (yesOrNo == 'y' || yesOrNo == 'Y')
{
break;
}
else
{
System.out.println("Please provide the information again");
}
}
System.out.println("Quarter Beginning Interest Ending");
System.out.println("Number Balance Earned Balance");
//here is where I am doing my calculations
for (int i = 0; i < numberOfQuarters; ++i)
{
interestEarned = (startingBalance * (interestRate / 100) * (0.25) );
endingBalance = startingBalance + interestEarned;
System.out.printf((i+1) + "%20.2f %14.2f %15.2f \n", startingBalance, interestEarned, endingBalance);
}
}
}
我真的是一个菜鸟，所以我很抱歉这可能是多么混乱，如果它是一些我应该知道的小事。
非常感谢你。
以下是具体部分：
System.out.println("You entered a principal balance of $" + startingBalance + " for " + numberOfQuarters + " quarters at " + interestRate + "% interest.");
System.out.println("Is this correct? (y/n)");
yesOrNo = userInput.next().charAt(0);
while(true)
{
if (yesOrNo == 'y' || yesOrNo == 'Y')
{
break;
}
else
{
System.out.println("Please provide the information again");
}
}
答案 0 :(得分：1)
在上述代码中，起始余额每季度变化而不是一个。因此，起始余额必须是上一季度的期末余额。 import java.util.Scanner;
class InterestCalculator
{
public static void main(String[] args)
{
Scanner userInput = new Scanner(System.in);
double startingBalance;
double interestRate;
double endingBalance;
double interestEarned;
char yesOrNo;
int temp;
int numberOfQuarters;
while(true)
{
System.out.println("Enter number of quarters from 1 to 10");
numberOfQuarters = userInput.nextInt();
if (numberOfQuarters > 0 && numberOfQuarters <=10)
{
break;
}
else
{
System.out.println("Number of quarters must be between 1 and 10 inclusive");
}
}
while(true)
{
System.out.println("Enter the beginning principal balance greater than zero");
startingBalance = userInput.nextDouble();
if (startingBalance > 0)
{
break;
}
else
{
System.out.println("Beginning balance must be greater than zero");
}
}
while(true)
{
System.out.println("Enter the interest rate percentage without the percent sign, greater than 0 percent and less than/equal to 20%"
);
interestRate = userInput.nextDouble();
if (interestRate > 0 && interestRate <= 20)
{
break;
}
else
{
System.out.println("Interest rate must be between 1 and 20 inclusive");
}
}
System.out.println("You entered a principal balance of $" + startingBalance + " for " + numberOfQuarters + " quarters at " + interestRate + "% interest.");
System.out.println("Is this correct? (y/n)");
yesOrNo = userInput.next().charAt(0);
while(true)
{
if (yesOrNo == 'y' || yesOrNo == 'Y')
{
break;
}
else
{
System.out.println("Please provide the information again");
}
}
System.out.println("Quarter Beginning Interest Ending");
System.out.println("Number Balance Earned Balance");
for (int i = 0; i < numberOfQuarters; ++i)
{
interestEarned = (startingBalance * (interestRate / 100) * (0.25) );
endingBalance = startingBalance + interestEarned;
System.out.printf((i+1) + "%20.2f %14.2f %15.2f \n", startingBalance, interestEarned, endingBalance);
startingBalance=endingBalance;
}
}
}
答案 1 :(得分：0)
我不知道你真正想要达到的目标，但我认为你错过了一个变量。你总是根据你的startingBalance进行计算，而且你永远不会改变它的值，所以你总是得到相同的值。
看看这是否有帮助。
double currentBalance = startingBalance;
for (int i = 0; i < numberOfQuarters; ++i) {
interestEarned = (currentBalance * (interestRate / 100) * (0.25));
endingBalance = currentBalance + interestEarned;
System.out.printf((i + 1) + "%20.2f %14.2f %15.2f \n", currentBalance, interestEarned, endingBalance);
currentBalance = endingBalance;
}
答案 2 :(得分：0)
你有一些无限循环。要解决你所拥有的每个其他clouse应该在最后一行中包含一个中断，这样它只会向控制台打印一条消息。以下是如何操作的一个示例：
while(true)
{
if (yesOrNo == 'y' || yesOrNo == 'Y')
{
break;
}
else
{
System.out.println("Please provide the information again");
break;
}
}
替换以下行：
System.out.println("Enter the interest rate percentage without the percent sign, greater than 0 percent and less than/equal to 20%");
行：
System.out.println("Enter the interest rate percentage without the percent sign, greater than 0 percent and less than/equal to " + startingBalance/numberOfQuarters );
错误的是，您将20％硬编码到打印行中。
答案 3 :(得分：0)
除了像硬编码值这样的小错误外，你还有严重的缺陷：
无限循环部分：
while (true) {
if (yesOrNo == 'y' || yesOrNo == 'Y') {
break;
} else {
System.out.println("Please provide the information again");
}
}
djointster所述，您尚未对计算进行正确的初始化，因此发送零（0）会使interestEarned为零。