索引超出范围。如何解决

Question

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

namespace test
{
    class Program
{
    static void Main(string[] args)
    {
        Console.WriteLine("Please enter the Principal: ");
        int principal = Convert.ToInt32(Console.ReadLine());

        Console.WriteLine("Please enter the rate: ");
        int rate = Convert.ToInt32(Console.ReadLine());

        int a = rate / 100;
        int b = a * principal;
        int x = b + principal;

        int[] sample = {};

        Console.WriteLine("How long do you want the loop to run: ");
        int loop = Convert.ToInt32(Console.ReadLine());

       // StringBuilder sb = new StringBuilder();

        for (int i = 0; i <= loop; i++)
        {

            sample[x] = x;

           // sb.AppendLine(x.ToString());
            b = a * x;
            x = b + x;
        }
        Console.WriteLine(sample);
    }
 }
}

您好，我刚开始学习 C#，今天老师讨论的主题是数组。所以我决定创建一个简单的利息计算器，但它给了我

“System.IndexOutOfRangeException：索引超出了数组的范围。”

Answer 1

做这样的事情

    Console.WriteLine("How long do you want the loop to run: ");
    int loop = Convert.ToInt32(Console.ReadLine());

    int[] sample = new int[loop];

从数组中设置长度

并将您的 for 循环从 (int i = 0; i loop; i++) 更改为 (int i = 0; i loop; i++)

Answer 2

您必须分配足够的空间：int[] sample = new int[loop];

数组在 C# 中从零开始索引，因此如果数组的长度为 X，则最后一个元素的索引为 X-1。所以你的 for 循环应该是：for (int i = 0; i < loop; i++)

您正在使用x 索引您的sample 数组，但我认为您不想使用i 对其进行索引。 sample[i] = x;

您正在打印一个数组，但它会输出System.Int32[]。我想你想打印出数组中的元素。

static void Main(string[] args)
{
    Console.WriteLine("Please enter the Principal: ");
    int principal = Convert.ToInt32(Console.ReadLine());

    Console.WriteLine("Please enter the rate: ");
    int rate = Convert.ToInt32(Console.ReadLine());

    int a = rate / 100;
    int b = a * principal;
    int x = b + principal;

    Console.WriteLine("How long do you want the loop to run: ");
    int loop = Convert.ToInt32(Console.ReadLine());

    int[] sample = new int[loop];

    for (int i = 0; i < loop; i++)
    {
        sample[i] = x;
        b = a * x;
        x = b + x;
    }

    for (int i = 0; i < sample.Length; i++)
        Console.WriteLine(sample[i]);
}