線程中的異常主

Question

我想創建一個程序來查找2個數字之間的所有連續數字的總和，我創建了一個代碼，但我得到這些錯誤。任何協助或擺脫這些錯誤的方法都會受到很大的影響。謝謝

Exception in thread "main" java.util.IllegalFormatPrecisionException: 1 
    at java.util.Formatter$FormatSpecifier.checkInteger(Formatter.java:2984) 
    at java.util.Formatter$FormatSpecifier.<init>(Formatter.java:2729) 
    at java.util.Formatter.parse(Formatter.java:2560) 
    at java.util.Formatter.format(Formatter.java:2501) 
    at java.io.PrintStream.format(PrintStream.java:970) 
    at java.io.PrintStream.printf(PrintStream.java:871) 
    at question15.Question15.main(Question15.java:29) 
Java Result: 1 
BUILD SUCCESSFUL (total time: 3 seconds)  


    /* 
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    * To change this template file, choose Tools | Templates 
    * and open the template in the editor. 
    */ 
    package question15; 

/** 
* 
* @author MatthewsMacbook 
*/ 
import java.util.Scanner; 
public class Question15 { 
private static double sumOfTheNumbers (double num1, double num2) 
{ 
double sum= ((num2* (num2 + 1))/2)-((num1-1)* ((num1-1)+1)/2); 
return sum; 
} 
    public static void main(String[] args) 
    { 
Scanner keyboard = new Scanner (System.in); 
System.out.println("This program finds the sum of all consecutive numbers between 2 numbers"); 
System.out.println("please enter the first number"); 
double enteredInt1=keyboard.nextDouble(); 

System.out.println("please enter the second number"); 
double enteredInt2=keyboard.nextDouble(); 
double end= sumOfTheNumbers (enteredInt1, enteredInt2); 
System.out.printf(" the sum of the numbers between %.1f"+"and : %.1d is: %.1f units", enteredInt1, enteredInt2, end); 

    } 

} 

Answer 1

您在打印聲明中有錯字。這是

System.out.printf(" the sum of the numbers between %.1f"+"and : %.1d is: %.1f units", enteredInt1, enteredInt2, end); 

它應該是：

System.out.printf(" the sum of the numbers between %.1f"+"and : %.1f is: %.1f units", enteredInt1, enteredInt2, end);