Question

我正在努力制作一个简单的成绩册计划。我的代码尚未完成，但我首先尝试构建它。我一直得到一个未解决的编译错误，对于我的生活我无法弄清楚。我知道这是一件简单而愚蠢的事情，但我和你的新人差不多。任何试图克服此错误的帮助（Exception in thread "main" java.lang.Error: Unresolved compilation problem: student cannot be resolved to a variable）都会非常感激！

import java.util.Scanner;
public class Gradebook {

/**
 * @param args
 */
public static void main(String[] args) {
    // TODO Auto-generated method stub

    float discussionweight, hwweight, examweight, discussion, hw, exam, finalaverage;

    // Initializes the input scanner
    Scanner scan = new Scanner(System.in);

System.out.print("Enter the students name: ");
    student = scan.next("");

    // Prompts for the weight of the discussions
    System.out.print ("Enter the weight of the discussions as an integer: ");
    discussionweight = scan.nextFloat();

    // Prompts for the discussions grade
    System.out.print ("Enter the score of the discussions as an integer: ");
    discussion = scan.nextFloat();

    // Prompts for the weight of the homework grade in an integer
    System.out.print ("Enter the weight of the homework as an integer: ");
    hwweight = scan.nextFloat();

    // Prompts for hw grade
    System.out.print ("Enter the hw grade: ");
    hw = scan.nextFloat();

    System.out.print("Enter the weight of the exam as an integer");
    examweight = scan.nextFloat();

    System.out.print("Enter the exam grade");
    exam = scan.nextFloat();



    // Calculate and print the final, weighted average.
    finalaverage = (((discussionweight * discussion) + (hw * hwweight) + (exam * examweight)) / 100);

    System.out.println ("The final average is "+ finalaverage);

    }

    } 
  }

}

Answer 1

看起来你永远不会声明一个名为student的变量。

string student = scan.next("");

与您正在使用的其他变量相同。

Answer 2

student = scan.next（＆＃34;＆＃34;）;

你永远不会告诉编译器学生是什么类型。

像String student = scan ...

之类的东西

Java成绩册计划

2 个答案: