所以我想做的是要求用戶輸入他們的體重和考試 1 和 2 的分數，如果他們輸入分數，則使用這些變量來計算當前分數。但是，由于分數是由用戶通過 if 語句內部的掃描器聲明的，因此它不允許我從 if 語句外部使用這些變量。當我想計算 csEx1 和 csEx2 時，如何使用變量“examOneScore”和“examTwoScore”。當我嘗試使用它們時，它顯示“局部變量 examOneScore 可能尚未初始化?！眎mport java.util.Scanner;public class CurrentScore{ public static void main(String[] args) { Scanner keyboard = new Scanner(System.in); System.out.printf("Weight of Exam 1: "); double weightExamOne = keyboard.nextDouble(); System.out.printf("Weight of Exam 2: "); double weightExamTwo = keyboard.nextDouble(); System.out.printf("Do you know your score of first exam? "); String examOne = keyboard.nextLine(); if(examOne.equalsIgnoreCase("yes") || examOne.equalsIgnoreCase("y")) { System.out.printf("Your score? "); double examOneScore = keyboard.nextDouble(); } System.out.printf("Do you know your score of secondexam? "); String examTwo = keyboard.nextLine(); if(answerTwo.equalsIgnoreCase("yes") || answerTwo.equalsIgnoreCase("y")) { System.out.printf("Your score? "); double examTwoScore = keyboard.nextDouble(); } double csEx1 = (weightExamOne * examOneScore); double csEx2 = (weightExamTwo * examTwoScore ); }}
1 回答
繁華開滿天機
TA貢獻1816條經驗 獲得超4個贊
您必須在 if 語句之外定義稍后要使用的變量：
public static void main(String[] args)
{
Scanner keyboard = new Scanner(System.in);
System.out.printf("Weight of Exam 1: ");
double weightExamOne = keyboard.nextDouble();
System.out.printf("Weight of Exam 2: ");
double weightExamTwo = keyboard.nextDouble();
System.out.printf("Do you know your score of first exam? ");
String examOne = keyboard.nextLine();
double examOneScore = 1;
if(examOne.equalsIgnoreCase("yes") || examOne.equalsIgnoreCase("y"))
{
System.out.printf("Your score? ");
examOneScore = keyboard.nextDouble();
}
System.out.printf("Do you know your score of second exam? ");
String examTwo = keyboard.nextLine();
double examTwoScore = 1;
if(examTwo.equalsIgnoreCase("yes") || examTwo.equalsIgnoreCase("y"))
{
System.out.printf("Your score? ");
examTwoScore = keyboard.nextDouble();
}
double csEx1 = (weightExamOne * examOneScore);
double csEx2 = (weightExamTwo * examTwoScore );
}
我使用值 1 來定義它們，你必須自己尋找你想要在那里使用的
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