如何解決此錯誤：結果無法解析為變量

Question

我輸入了這個Java程序，計算了對Eclipse的簡單興趣。

import java.util.Scanner;

public class PercentageCalculator 
{
public static void main(String[] args)
{
    double x = 0;
    double y = 0;

    Scanner scanner = new
            Scanner(System.in);
    System.out.println("Enter the value of x: ");
    x = scanner.nextDouble();
    System.out.println("Enter the value of y: ");
    y = scanner.nextDouble();
    System.out.println();
    System.out.println("Calculating percentage: (x % of y): ");

    System.out.println(x + " % of" + y + "is " + result);
    System.out.println(); 
}

}

但是當我嘗試運行它時，它給了我以下信息：

Exception in thread "main" java.lang.Error: Unresolved compilation problem: 
result cannot be resolved to a variable

at PercentageCalculator.main(PercentageCalculator.java:19)

這是什么意思，我該如何解決？

Answer 1

聲明結果變量

double result = 0;

然后計算百分比並將其分配給結果變量。

result = your calculation;

然后打印

System.out.println(x + " % of" + y + "is " + result);

希望這會有所幫助:)

Answer 2

您尚未聲明結果變量

double result=0;