Question

我正在尝试编写一种计算复合兴趣的方法。这是我不断收到的错误消息：

Exception in thread "main" java.util.UnknownFormatConversionException: Conversion = '.'
    at java.util.Formatter.checkText(Unknown Source)
    at java.util.Formatter.parse(Unknown Source)
    at java.util.Formatter.format(Unknown Source)
    at java.io.PrintStream.format(Unknown Source)
    at java.io.PrintStream.printf(Unknown Source)
    at Balance.main(Balance.java:5)

我不太确定从哪里开始。如果有人能指出我正确的方向，我将不胜感激。（作业需要System.out.printf("%.2\n", balance(1000.0, .05, 8.5));）

public class Balance {
public static void main(String[] args) {

    System.out.printf("%.2\n", balance(1000.0, .05, 8.5));
}

public static double balance(double initialBalance, double interestRate,
        double years) {

    double compoundedInterest = initialBalance * Math.pow(1 + interestRate,        years);
    return compoundedInterest;
}
}

Answer 1

您错过f浮动格式。试试System.out.printf("%.2f\n",balance(1000.0, .05, 8.5));

Answer 2

您忘了提及f来指定那里的浮动格式。

System.out.printf("%.2f\n", balance(1000.0, .05, 8.5)); // .2f is the proper syntax

Answer 3

这就是你写的

   System.out.printf("%.2\n", balance(1000.0, .05, 8.5));

我认为你在写％。2f

时错过了f

System.out.printf("%.2f\n", balance(1000.0, .05, 8.5));

编写一种计算复合兴趣的方法

3 个答案: