我似乎无法弄清楚接下来要做什么。 它一直说“不是声明”

Question

我得到了一组要调试的代码，除了最后一行一直告诉我它是“不是声明”之外，我已经调试了所有代码，我只是对下一步要做什么感到困惑。 如果有人能在这里帮助我，我将不胜感激。

错误信息截图

这也是图片中的代码。

// This program calculates the sale price of an
// item that is regularly priced at $59, with
// a 20 percent discount subtracted.

import java.util.Scanner;  // Needed for the Scanner class

public class Discount
{
   public void main(String[] args)
   {
      Variables to; hold the; regular price, the;
      amount of; a discount, and; the sale; price;
      double regularPrice = 59.0;
      double salePrice;
      
      // Create a Scanner object to read input
      scanner keyboard = new Scanner(System.input);
      
      // Get the regular price
      System.out.print("Enter regular price");
      regularPrice = key.next();
      
      // Calculate the amount of a 20% discount.
      discount = regularPrice * 0.20;
      
      // Calculate the sale price by subtracting
      // the discount from the regular price.
      salePrice = regularPrice - discount;
      
      // Display the results.
      system.println("Regular price: $ + regularprice");
      system.println("Discount amount: $ + discount");
      system.println("Sale price: $ + total");
   
}
}

Answer 1

注释这两行：

Variables to; hold the; regular price, the;
amount of; a discount, and; the sale; price;

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