c# - 我的代码存在逻辑错误

Question

我写了这段代码，但它总是显示相同的结果，为什么？该代码是一种搜索方法。

using System;
using System.Collections.Generic;
using System.Text;

namespace CArraySe
{
    class Program
    {
        class CArray
        {
            private int[] arr;
            private int upper;
            private int numElements;
            private int compCount;

            public CArray(int size)
            {
                arr = new int[size];
                upper = size - 1;
                numElements = 0;
                compCount = 0;
            }

            public void Insert(int item)
            {
                arr[numElements] = item;
                numElements++;
            }

            public void DisplayElements()
            {
                for (int i = 0; i <= upper; i++)
                {
                    Console.Write(arr[i]);
                    if (i == upper)
                    {
                        Console.WriteLine();
                        continue;
                    }
                    Console.Write(", ");
                }
            }

            public void Clear()
            {
                for (int i = 0; i <= upper; i++)
                    arr[i] = 0;
                numElements = 0;
            }
            public bool SeqSearch(CArray n, int sValue)
            {
                for (int index = 0; index < n.upper; index++)
                {
                    if (arr[index] == sValue)

                        return true;
                }

                compCount++;
                return false;
            }
            public int binSearch(CArray n, int value)
            {
                int upperBound, lowerBound, mid;
                upperBound = n.upper; lowerBound = 0;

                while (lowerBound <= upperBound)
                {
                    mid = (upperBound + lowerBound) / 2;

                    if (arr[mid] == value)
                        return mid;

                    else if (value < arr[mid]) upperBound = mid - 1;

                    else lowerBound = mid + 1;
                }
                compCount++;
                return -1;
            }

            static void Main(string[] args)
            {
                CArray nums = new CArray(10);
                Random rnd = new Random(100);
                for (int i = 0; i < 10; i++)
                    nums.Insert((int)(rnd.NextDouble() * 100));

                Console.WriteLine();
                Console.Write("The Binary Search Result is: ");
                Console.WriteLine(nums.binSearch(nums, 500));
                Console.WriteLine(nums.compCount);
                nums.Clear();
                for (int i = 0; i < 10; i++)
                    nums.Insert((int)(rnd.NextDouble() * 100));

                Console.Write("The Sequential Search result is: ");
                Console.WriteLine(nums.SeqSearch(nums, 500));
                Console.WriteLine(nums.compCount);
           }
       }
    }
}

即使我更改了要查找的数字，它也总是显示相同的结果。

输出是:

The Binary Search Result is: -1
1
The Sequential Search result is: False
2
Press any key to continue . . .

Answer 1

我认为未找到您正在搜索的值 (500)。尝试输出 nums 数组并验证您要查找的内容是否在数组中。

另外，一个搜索返回一个 int，另一个返回一个 bool。这有什么具体原因吗？

编辑:另外，Binary Search仅适用于排序列表。