Aprenda Palindrome Checker | Text Analysis & Simple Ciphers

Palindromes are words or phrases that read the same forwards and backwards, such as "level" or "racecar." They are often used in puzzles and are studied in computer science to practice string manipulation and text analysis. Checking for palindromes helps you understand how to process and compare text in flexible ways.

Program.cs


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using System;

namespace ConsoleApp
{
    public class Program
    {
        public static void Main(string[] args)
        {
            Console.WriteLine("Enter a word or phrase:");
            string input = Console.ReadLine();

            // Remove spaces and convert to lowercase
            string cleaned = input.Replace(" ", "").ToLower();

            // Reverse the cleaned string
            char[] chars = cleaned.ToCharArray();
            Array.Reverse(chars);
            string reversed = new string(chars);

            if (cleaned == reversed)
            {
                Console.WriteLine("This is a palindrome!");
            }
            else
            {
                Console.WriteLine("This is not a palindrome.");
            }
        }
    }
}

To check if a string is a palindrome, you first need to clean the string by removing spaces and converting all letters to the same case. This ensures that differences in capitalization or spacing do not affect the result. After cleaning, reverse the string and compare it to the original cleaned version. If they match, the input is a palindrome.

Program.cs


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// File: Program.cs
using System;

namespace ConsoleApp
{
    public class Program
    {
        public static void Main(string[] args)
        {
            Console.WriteLine("Enter a phrase:");
            string input = Console.ReadLine();

            // Remove spaces and punctuation, and convert to lowercase
            string cleaned = "";
            foreach (char c in input)
            {
                if (char.IsLetterOrDigit(c))
                {
                    cleaned += char.ToLower(c);
                }
            }

            // Reverse the cleaned string
            char[] chars = cleaned.ToCharArray();
            Array.Reverse(chars);
            string reversed = new string(chars);

            if (cleaned == reversed)
            {
                Console.WriteLine("This is a palindrome!");
            }
            else
            {
                Console.WriteLine("This is not a palindrome.");
            }
        }
    }
}

When checking for palindromes, you might encounter phrases that include spaces, punctuation, or mixed case letters. For example, "A man, a plan, a canal, Panama" is a well-known palindrome when ignoring spaces and punctuation. This is why normalization—removing irrelevant characters and standardizing the text—is essential. Without normalization, your program could miss palindromes or give incorrect results. Always consider edge cases like empty strings, single characters, or input containing only punctuation.

Definition

Definition: In text processing, normalization means changing text to a consistent format, such as converting all letters to lowercase and removing spaces or punctuation, so comparisons are fair and accurate.


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// General palindrome checking algorithm (not runnable)
string Clean(string input)
{
    // Remove unwanted characters and convert to lowercase
    // Return the cleaned string
}

bool IsPalindrome(string input)
{
    string cleaned = Clean(input);
    string reversed = Reverse(cleaned);
    return cleaned == reversed;
}

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Seção 3. Capítulo 1

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Program.cs


              12345678910111213141516171819202122232425262728293031
            
using System;

namespace ConsoleApp
{
    public class Program
    {
        public static void Main(string[] args)
        {
            Console.WriteLine("Enter a word or phrase:");
            string input = Console.ReadLine();

            // Remove spaces and convert to lowercase
            string cleaned = input.Replace(" ", "").ToLower();

            // Reverse the cleaned string
            char[] chars = cleaned.ToCharArray();
            Array.Reverse(chars);
            string reversed = new string(chars);

            if (cleaned == reversed)
            {
                Console.WriteLine("This is a palindrome!");
            }
            else
            {
                Console.WriteLine("This is not a palindrome.");
            }
        }
    }
}

Program.cs


              123456789101112131415161718192021222324252627282930313233343536373839
            
// File: Program.cs
using System;

namespace ConsoleApp
{
    public class Program
    {
        public static void Main(string[] args)
        {
            Console.WriteLine("Enter a phrase:");
            string input = Console.ReadLine();

            // Remove spaces and punctuation, and convert to lowercase
            string cleaned = "";
            foreach (char c in input)
            {
                if (char.IsLetterOrDigit(c))
                {
                    cleaned += char.ToLower(c);
                }
            }

            // Reverse the cleaned string
            char[] chars = cleaned.ToCharArray();
            Array.Reverse(chars);
            string reversed = new string(chars);

            if (cleaned == reversed)
            {
                Console.WriteLine("This is a palindrome!");
            }
            else
            {
                Console.WriteLine("This is not a palindrome.");
            }
        }
    }
}

Definition


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// General palindrome checking algorithm (not runnable)
string Clean(string input)
{
    // Remove unwanted characters and convert to lowercase
    // Return the cleaned string
}

bool IsPalindrome(string input)
{
    string cleaned = Clean(input);
    string reversed = Reverse(cleaned);
    return cleaned == reversed;
}

Tudo estava claro?

Obrigado pelo seu feedback!

Seção 3. Capítulo 1

Palindrome Checker

1. What is a palindrome?

2. Why is it important to ignore case when checking for palindromes?

3. What does normalization mean in text processing?

Palindrome Checker

1. What is a palindrome?

2. Why is it important to ignore case when checking for palindromes?

3. What does normalization mean in text processing?