c# - C# & VS error: "make sure that the maximum index on a list is less than the list size"

Question

I faced the error mentioned in the title when doing my homework, and simply can't find a way to remove it. Here is the method that I have this problem with:

public static double LaskeMiidi(double[] luvut)
{
    double ka = Keskiarvo(luvut);
    double miidi = luvut[0];

    for (int i = 0; i < luvut.Length; i++)
    {
        if (luvut[i] - ka < luvut[i + 1] - ka) // The line error points to!
        {
            miidi = luvut[i];
        }
        else
        {
            miidi = luvut[i + 1];
        }
    }
    return miidi;
}

So basically the problem is that when I say luvut[i + 1], at some point this index might become more than the length of the array is. I just can't figure out any ways to solve this problem, since I'm only a beginner with programming.

Answer 1

是的，这就是问题所在：

for (int i = 0; i < luvut.Length; i++)
{
    if (luvut[i] - ka < luvut[i + 1] - ka)

什么时候i是luvut.Length - 1，那么i + 1将是luvut.Length- 因此是一个无效的索引。（对于 length 数组x，有效索引0应x - 1包含在内。）您可能希望提前结束一次迭代：

for (int i = 0; i < luvut.Length - 1; i++)

这种方式i + 1仍然是数组中的有效索引 - 无论是在条件中还是在子句if的主体中。else

Answer 2

请注意，当您定义一个数组时，项目范围在 0 和array.length-1. 所以你应该写：

for (int i = 0; i < luvut.Length-1; i++)

Answer 3

当i = luvut.Length -1,luvut[i + 1]超出数组边界时会出错。

您需要：

for (int i = 0; i < luvut.Length - 1; i++)

或者luvut[i + 1]在另一个 If 块中以另一种方式处理问题。

Answer 4

提前结束循环：

for (int i = 0; i < luvut.Length - 1; i++)

这会阻止循环到达索引无效的点。