Go Program to Check if a Given Number is a Palindrome

This program checks whether a given number is a palindrome. A palindrome is a number that reads the same backward as forward, such as 121 or 1331.

Program Structure and Explanation

The program is written in the Go programming language and consists of the following parts:

1. Package Declaration: Declares the main package which is required for an executable program.
2. Imports: Imports the fmt package for formatted I/O operations.
3. isPalindrome Function: A function that checks if a given integer is a palindrome.
4. Main Function: The entry point of the program where user input is taken and the isPalindrome function is called.

Go Code:

// Package declaration
package main

// Importing necessary package
import (
    "fmt"
)

// isPalindrome function checks if a given number is a palindrome
func isPalindrome(number int) bool {
    // A negative number cannot be a palindrome
    if number < 0 {
        return false
    }
    
    // Initialize variables to store the original number and its reverse
    original := number
    reversed := 0

    // Loop to create the reverse of the number
    for number != 0 {
        // Get the last digit of the number
        digit := number % 10
        // Append the digit to the reversed number
        reversed = reversed*10 + digit
        // Remove the last digit from the number
        number /= 10
    }

    // Check if the original number and reversed number are the same
    return original == reversed
}

// Main function
func main() {
    // Variable to hold user input
    var number int

    // Prompt the user for input
    fmt.Print("Enter a number: ")
    fmt.Scan(&number)

    // Check if the number is a palindrome and print the result
    if isPalindrome(number) {
        fmt.Printf("%d is a palindrome.\n", number)
    } else {
        fmt.Printf("%d is not a palindrome.\n", number)
    }
}

Explanation:

isPalindrome Function:

• First, it checks if the number is negative. If it is, the function returns false because a negative number cannot be a palindrome.
• It then initializes two variables: original to store the original number and reversed to build the reversed number.
• A loop runs while the number is not zero, extracting the last digit of the number and appending it to reversed. The last digit is then removed from the number.
• Finally, the function checks if the original number is equal to the reversed number and returns the result.

Main Function:

• It declares a variable number to hold the user input.
• Prompts the user to enter a number and reads the input using fmt.Scan.
• Calls the isPalindrome function with the user input and prints whether the number is a palindrome or not.