在C＃中编写一个函数，检查给定的句子是否是回文。 [英] Write a function in C# that checks if a given sentence is a palindrome.

问题描述

在C＃中编写一个函数，检查给定的句子是否是回文。回文是一个单词，短语，诗句或句子，向后或向前读取相同的词。只考虑英文字母（AZ和az）的顺序，其他字符应该被忽略。



例如，IsPalindrome（Noel看到Leon。）应该返回true，因为空格，句点和大小写应该被忽略，因为它是向后和向前读取的noelseesleon，这是一个回文。



什么我试过了：

Write a function in C# that checks if a given sentence is a palindrome. A palindrome is a word, phrase, verse, or sentence that reads the same backward or forward. Only the order of English alphabet letters (A-Z and a-z) should be considered, other characters should be ignored.

For example, IsPalindrome("Noel sees Leon.") should return true as spaces, period, and case should be ignored resulting with "noelseesleon" which is a palindrome since it reads same backward and forward.

What I have tried:

using System;

public class Palindrome
{
public static bool IsPalindrome(string str)
{
string rev = "";
//string [] words
  
for(int i = input1.Length-1; i >= 0; i--)
       {
   rev += input1[i];
}
  
if(str.ToLower() == rev.ToLower())
{
return true;
  
}else{
return false;
}
}

public static void Main(string[] args)
{
Console.WriteLine(IsPalindrome("Noel sees Leon."));
}
}

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试试这个

Try this

class Program
  {
      static void Main(string[] args)
      {
          Console.WriteLine(IsPalindrome("Noel sees Leon."));
          Console.ReadLine();
      }

      public static bool IsPalindrome(string str)
      {
          string forward = "";
          foreach (char c in str.ToLower())  // ToLower to ignore the case
              if (char.IsLetter(c))  // ignore the period, space and other char except alphabets
                  forward += c;

          char[] temp = forward.ToCharArray();
          Array.Reverse(temp);
          string reverese = new string(temp);
          return forward == reverese;
      }
  }

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