C# 从文本文件中写入最长和最短回文
我试图写一个程序,将写最长和最短的回文从文字在文本文件。我的代码现在看起来像这样:C# 从文本文件中写入最长和最短回文,c#,arrays,string,text-files,palindrome,C#,Arrays,String,Text Files,Palindrome,我试图写一个程序,将写最长和最短的回文从文字在文本文件。我的代码现在看起来像这样: static void Main(string[] args) { string[] lines = System.IO.File.ReadAllLines(@"C:\palindromy.txt"); foreach (string line in lines) { char[] charArray = line.ToCh
static void Main(string[] args)
{
string[] lines = System.IO.File.ReadAllLines(@"C:\palindromy.txt");
foreach (string line in lines)
{
char[] charArray = line.ToCharArray();
for (int i = 0; i < 1; i++)
{
Array.Reverse(charArray);
bool a = charArray.SequenceEqual(line);
while(a == true)
{
Console.WriteLine(line); /that will just write all palindroms
break;
}
}
}
}
我目前正在写所有的回文,但我需要写最长和最短的回文
static void Main(string[] args)
{
string[] lines = System.IO.File.ReadAllLines(@"C:\palindromy.txt");
private string longest;
private string shortest;
foreach (string line in lines)
{
char[] charArray = line.ToCharArray();
for (int i = 0; i < 1; i++)
{
Array.Reverse(charArray);
bool a = charArray.SequenceEqual(line);
if(a)
{
if(a.Length > longest.length)
{
longest = a;
}
if(a.Length<shortest.length)
{
shortest = a;
}
}
}
}
Console.WriteLine(longest);
Console.WriteLine(shortest);
}
在我的脑海中,它看起来像这样。与前面的答案类似,但有以下建议 初始化最长和最短。 比较时忽略大小写。仍然可以使用SequenceEqual执行此操作,而不是比较字符串。如果你知道你不会拿Anna和Anna作比较,可能就不需要了。 当检查是否找到最短的时,您需要记住这一点 最短.Length的起始值为0,因此如果最短.Length==0,您将希望存储在最短中找到的第一个回文
static void Main(string[] args)
{
var lines = System.IO.File.ReadAllLines(@"C:\palindromy.txt");
string longest = string.Empty;
string shortest = string.Empty;
foreach (var line in lines)
{
if (line.Length == 0) continue;
char[] charArray = line.ToCharArray();
Array.Reverse(charArray);
string reversedLine = new string(charArray);
if (line.Equals(reversedLine, StringComparison.OrdinalIgnoreCase))
{
if (line.Length > longest.Length)
{
longest = line;
}
if (line.Length < shortest.Length || shortest.Length == 0)
{
shortest = line;
}
}
}
Console.WriteLine(longest);
Console.WriteLine(shortest);
}
如果您使用一些LINQ,您可以在很大程度上简化它:
string[] lines = System.IO.File.ReadAllLines(@"C:\palindromy.txt");
var palindromes = lines.Where(x => x == new string(x.ToCharArray()
.Reverse()
.ToArray()));
var shortest = palindromes.Aggregate((a, b) => a.Length < b.Length ? a : b);
var longest = palindromes.Aggregate((a, b) => a.Length > b.Length ? a : b);
Console.WriteLine("The shortest palindrome is {0}.", shortest);
Console.WriteLine("The longest palindrome is {0}.", longest);
下面是一个简单的控制台应用程序,它完全满足您的要求。单词在一个列表中,因此您必须从文本文件中读取单词并将其存储在列表中
using System;
using System.Collections;
using System.Collections.Generic;
namespace PalinDromes
{
class MainClass
{
public static void Main (string[] args)
{
List<string> words = new List<string> () { "anotherword","civic", "deified", "lemel", "pop" ,"noon"};
string shortest = "";
string longest = "";
foreach (string word in words)
{
if (isPalindrome (word))
{
if (word.Length > longest.Length)
longest = word;
else if (shortest == "" || word.Length < shortest.Length)
shortest = word;
}
}
Console.WriteLine ("Shortest: {0}", shortest);
Console.WriteLine ("Longest: {0}", longest);
}
public static bool isPalindrome(string word)
{
return word == ReverseString (word);
}
public static string ReverseString(string s)
{
char[] arr = s.ToCharArray();
Array.Reverse(arr);
return new string(arr);
}
}
}
将最长回文存储在变量中,然后在foreach之后写入变量。注意:不要在执行单个指令时使用while,如果{Console.WriteLine}也有一个for循环,该循环只迭代一次,则最好使用它。添加两个新变量,称为shortest和longest。将whilea==true更改为a。在此范围内,检查回文的长度是否大于最长变量,如果大于,则进行设置。与最短变量相同。