Question

这是练习：

编写一个程序，它从控制台读取两个数组，并检查它们是否相等（当两个数组长度相等且所有元素具有相同的索引时，它们相等）。

这是我的代码：

        //Declaration, Initialization.
        Console.Write("First array size: ");
        int sizeOfFirstArray = int.Parse(Console.ReadLine());
        int[] firstArray = new int[sizeOfFirstArray];

        Console.Write("Second array size: ");
        int sizeOfSecondArray = int.Parse(Console.ReadLine());
        int[] secondArray= new int[sizeOfSecondArray];

        // Checking if Array's are equal.

        bool isEqual = true;

        for (int a = 0; a < firstArray.Length; a++)
        {
            Console.WriteLine("Enter first array's values of element: {0}", a);
            firstArray[a] = int.Parse(Console.ReadLine());
        }

        for (int b = 0; b < secondArray.Length; b++)
        {
            Console.WriteLine("Enter second array's values of element: {0}", b);
            secondArray[b] = int.Parse(Console.ReadLine());
        }

        if (firstArray[firstArray.Length] != secondArray[secondArray.Length]) // This gives me an error Index was out of bounds
        {
            isEqual = false;
        }$

我想用for循环解决这个练习。

问题：第38行给出了一个错误：索引超出了数组边界。

Answer 1

错误的直接原因在于

  if (firstArray[firstArray.Length]...

由于数组从零开始，因此它们具有[0..Length - 1]个索引项;你的意思是

  // if lengths (not items!) are different then arrays are not equal
  if (firstArray.Length != secondArray.Length) {
    isEqual = false;
  }

按照书中所写的那样做：

  ...

   // Two arrays are equal if they are of equal length...
   bool isEqual = a.Length == b.Length;

   // ..and all of their elements which have the same index, are equal
   if (isEqual) // We don't need to scan arrays if they are not equal by their lengths 
     for (int i = 0; i < a.Length; ++i)
       if (a[i] != b[i]) {
         isEqual = false; // 1st counter example has been found

         // we don't need to loop any more if a counter example has been found
         break; 
       }

请注意，在真实世界中我们放

bool isEqual = a.SequenceEqual(b);

无法通过书籍解决练习

1 个答案: