Question

我在这项任务中遇到了很多错误。我尽可能多地完成了它并且似乎按顺序完成了一切，但JGrasp告诉我有49个错误。我在第30,31,33,36,37,40,41,42,43,47,48,54,55,56和57行遇到错误。根据我的教科书，我做的一切都是正确的。我该如何解决这个问题？

我在每一行给我带来麻烦之后添加了“here”评论。

完整计划：

import java.util.Scanner;

public class AverageRainfall { 
    public static void main(String[] args) {
        double monthRain = 0;          // Rain for a month
        double totalRain = 0;          // Rainfall accumulator
        double average = 0;            // Average rainfall
        // Keyboard input.
        Scanner keyboard = new Scanner(System.in);
        // Number of years.
        System.out.print("Enter the number of years: ");
        int years = 0; // Number of years
        years = keyboard.nextInt();
        // Checks input.
        while (years < 1) {
            System.out.print("Invalid. Enter 1 or greater: ");
            input anotheryears = keyboard.nextInt();
        }
    }

    final int NUM_MONTHS = 12; // Months per year

    System.out.println("Enter the rainfall, in inches, for each month."); //here           
    for (int y = 1; y <= years; y++); //here
       {
         for (int m = 1; m <= NUM_MONTHS; m++); //here
         {
            // Gets rainfall for each month.
            System.out.print("Year " + y + " month " + m + ": "); //here
            monthRain = keyboard.nextDouble(); //here

            // Checks input.
            while (monthRain < 0) //here
            { //here
             System.out.print("Invalid. Enter 0 or greater: "); //here
             monthRain = keyboard.nextDouble(); //here
            }

            // Accumulates rainfall.
            totalRain += monthRain; //here
         } //here
      }
      // Calculates average rainfall.
      average = totalRain / (years * NUM_MONTHS);
      // Displays statistics.
      System.out.println("\nNumber of months: " + (years * NUM_MONTHS)); //here
      System.out.println("Total rainfall: " + totalRain + " inches"); //here
      System.out.println("Average monthly rainfall: " + average + " inches"); //here
}

Answer 1

缩进代码。主要问题在于：

public static void main(String[] args) {
    double monthRain = 0; 
    //more code...
    while (years < 1) {
        System.out.print("Invalid. Enter 1 or greater: ");
        input anotheryears = keyboard.nextInt();
    }
} //<--- here
//you're closing the main method
//and then you have more code outside of it
final int NUM_MONTHS = 12; // Months per year

System.out.println("Enter the rainfall, in inches, for each month."); //here           
for (int y = 1; y <= years; y++); //here
    //rest of code

除此之外，请在for语句后删除分号：

for (int y = 1; y <= years; y++); //<-- remove this

应该是这样的：

for (int y = 1; y <= years; y++) {
    //rest of code...
}

Answer 2

你已经关闭了你的主要块，所以年份变量超出了奇怪的没有方法块的语句的范围。

我认为你在某个地方有一个额外的大括号，或者缺少一个大括号。

编译器错误：<identifier>预期。我该如何解决这个问题？</identifier>

2 个答案: