C＃中数组索引超出范围

Question

基本上，我需要编写一个程序来计算x年内每月的平均降雨量。 我希望它询问用户多少年，然后使用for循环遍历所有月份，最后计算平均降雨量。 但是运行时出现错误

Rainfall.exe中发生了'System.IndexOutOfRangeException'类型的未处理异常

我认为正在发生的事情是，在内部for循环完成后，将y设置为12，这会使数组超出范围，但是我认为，一旦外部数组完成每个循环，内部的y变量就会重置为0。

有人能对此有所启发吗？

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Rainfall
{
   class Program
   {
     static void Main(string[] args)
     {
        Console.WriteLine("This program will calculate the average amount of rainfall per month over the course of x years. ");
        Console.WriteLine();

        double years = 0;

        Console.WriteLine("Over how many years will this calculation take place?");

        years = int.Parse(Console.ReadLine());
        string[] months =  {"January", "February", "March", "April", "May", "June", "July", "August", "October", "November", "December" };

        double totalRainfall = 0;
        double monthRain = 0;
        double totalMonths = 0;
        double averageRainfall = 0;

        for (int x = 0; x < years; x++)
        {
            for(int y = 0; y < 12; y++)
            {
                Console.WriteLine("Enter the rainfall for the month of {0}", months[y]);

                monthRain = int.Parse(Console.ReadLine());

                totalRainfall = totalRainfall + monthRain;
            }
        }

        averageRainfall = totalRainfall / totalMonths;

        Console.WriteLine("The average rainfall per month is " + averageRainfall);
        Console.ReadLine();
     }
   }
}

Answer 1

在for循环中，您希望有12个月，但是在您的几个月中，您只有11个月-缺少9月。 添加它，一切都应该正常工作：

string[] months =  {"January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December" };