Question

How to check if the binary representation of a number is a palindrome in C#

Answer 1

using System;

class Program
{
    public static int reverseBits(int n) {
        int reversed = 0;

        int temp = n;
        while (temp > 0) {
            reversed = (reversed << 1) | (temp & 1);
            temp = temp >> 1;
        }
        return reversed;
    }
    public static bool isPalindrome(int n) {
        return n == reverseBits(n);
    }
    static void Main() {
        int n = 27;
        
        Console.WriteLine(Convert.ToString(n, 2));
        
        Console.WriteLine((isPalindrome(n) ? "Yes" : "No"));
    }
}





/*
run:

11011
Yes

*/

 

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Answer 2

using System;
using System.Linq;
 
class Program
{
    public static bool isPalindrome(int n) {
        return Convert.ToString(n, 2) == String.Join("", Convert.ToString(n, 2).Reverse());
    }
    static void Main() {
        int n = 27;
         
        Console.WriteLine(Convert.ToString(n, 2));
         
        Console.WriteLine((isPalindrome(n) ? "Yes" : "No"));
    }
}
 
 
 
 
 
/*
run:
 
11011
Yes
 
*/

 

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Answer 3

using System;
using System.Linq;
 
public class MyClass
{
    private static bool is_binary_representation_of_number_palindrome(int num)  {
        string binary = Convert.ToString(num, 2);
 
        Console.WriteLine(binary);
 
        return binary.Equals(String.Join("", binary.Reverse()));
    }
 
    public static void Main(string[] args)
    {
        int num = 153; // 10011001
 
        if (is_binary_representation_of_number_palindrome(num)) {
            Console.Write("Palindrome");
        }
        else {
            Console.Write("Not Palindrome");
        }
    }
}
 
 
 
 
 
/*
run:
      
10011001
Palindrome
      
*/

 

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