java - Java 中 System.out.printf 命令的问题

Question

我是编程新手，所以我提前道歉。我正在运行一个程序，但遇到了 Java 中的 System.out.printf 方法的问题。我知道程序中的其他所有内容都正常工作(经过测试)。但是，这似乎不起作用。

错误是:

Exception in thread "main" java.util.IllegalFormatConversionException: d != java.lang.Double
at java.util.Formatter$FormatSpecifier.failConversion(Unknown Source)
at java.util.Formatter$FormatSpecifier.printInteger(Unknown Source)
at java.util.Formatter$FormatSpecifier.print(Unknown Source)
at java.util.Formatter.format(Unknown Source)
at java.io.PrintStream.format(Unknown Source)
at java.io.PrintStream.printf(Unknown Source)
at Advisor_Score.main(Advisor_Score.java:17)

我的代码是:

import java.lang.Math;
public class Advisor_Score {
    public static void main(String[] args){ 
        double l[] = {101,1,1,1};
        double k[] = {102,2,2,4};
        double m[] = {103,5,5,5,5,5,5,5};
        double All_users[][]={l,k,m};
        double sum[]=new double [All_users.length];
        double [] raw_advisor=new double [All_users.length];
        double []advisor_score= new double [All_users.length];
        for (int i=0;i<All_users.length;i++){
                for(int j=1;j<All_users[i].length;j++){
                        sum[i]+=All_users[i][j];
                }
                raw_advisor[i]=((sum[i]-(3*(All_users[i].length-1)))/4);
                advisor_score[i]= 2.5+(2.5*(1-Math.pow(Math.E, -.5*raw_advisor[i])));
                System.out.printf("%d: %d\n", All_users[i][0], advisor_score[i]);
                }       
    }
}

不确定为什么它不起作用。

Answer 1

%d 代表一个整数；您想将 %f 用于 double 。见 formatting string syntax在 Javadoc 中