# Palindrome Program using Golang

## Introduction

A word or group of words that is the same when you read it forwards from the beginning or backwards from the end.

for e.g. Refer, Level, and etc.

In this article I will you how to check palindrome number and string.

### Write checkStringPalindrome() function to check palindrome string

```go
// checkStringPalindrome function Check whether a String is palindrome or not
func checkStringPalindrome(str string) bool {
	count := len(str)
	for i := 0; i < count/2; i++ {
		if str[i] != str[count-1-i] {
			return false
		}
	}

	return true
}
```

### Write checkNumberPalindrome() function to check palindrome number

```go
func checkNumberPalindrome(number uint64) bool {
	num := number
	var reverseNum uint64 = 0
	var a uint64
	for {
		a = num % 10
		reverseNum = reverseNum*10 + a
		num /= 10

		if num == 0 {
			break
		}
	}

	if number == reverseNum {
		return true
	} else {
		return false
	}

}
```

### Create a function to remove non-alpha characters

```go
// removeSpecialCharacters removes non-alphanumeric characters from a string
func removeSpecialCharacters(str string) string {
	return strings.Map(func(r rune) rune {
		if unicode.IsLetter(r) || unicode.IsDigit(r) || unicode.IsSpace(r) {
			return r
		}
		return -1
	}, str)
}
```

### Write main() function

```go
func main() {
	// Taking string input from user for palindrome check
	var str string
	reader := bufio.NewReader(os.Stdin)
	fmt.Println("Enter a string:")

	// Read the input until the newline character
	input, err := reader.ReadString('\n')
	if err != nil {
		fmt.Println("Error reading input:", err)
		return
	}

	// Trim the newline character from the end
	str = strings.TrimSpace(input)
	// Replace spaces with empty string
	str = strings.ReplaceAll(str, " ", "")
	// Convert to lower case
	str = strings.ToLower(str)
	// Remove special characters
	str = removeSpecialCharacters(str)

	if checkStringPalindrome(str) {
		fmt.Println(str, "is Palindrome")
	} else {
		fmt.Println(str, "is not Palindrome")
	}

	var number uint64
	fmt.Println("Enter a number(without space): ")
	_, err = fmt.Scanln(&number)
	if err != nil {
		log.Fatalf("Error reading input: %v\n", err)
		return
	}

	if checkNumberPalindrome(number) {
		fmt.Println(number, "is Palindrome")
	} else {
		fmt.Println(number, "is not Palindrome")
	}

}
```

### Combined all together

```go
package main

import (
	"bufio"
	"fmt"
	"log"
	"os"
	"strings"
	"unicode"
)

// Example 1: Golang Program code to Check whether a string is palindrome or not
func checkStringPalindrome(str string) bool {
	count := len(str)
	for i := 0; i < count/2; i++ {
		if str[i] != str[count-1-i] {
			return false
		}
	}

	return true
}

// Example 2: Golang Program Code to Check whether a Number is palindrome or not
func checkNumberPalindrome(number uint64) bool {
	num := number
	var reverseNum uint64 = 0
	var a uint64
	for {
		a = num % 10
		reverseNum = reverseNum*10 + a
		num /= 10

		if num == 0 {
			break
		}
	}

	if number == reverseNum {
		return true
	} else {
		return false
	}

}

// removeSpecialCharacters removes non-alphanumeric characters from a string
func removeSpecialCharacters(str string) string {
	return strings.Map(func(r rune) rune {
		if unicode.IsLetter(r) || unicode.IsDigit(r) || unicode.IsSpace(r) {
			return r
		}
		return -1
	}, str)
}

func main() {
	// Taking string input from user for palindrome check
	var str string
	reader := bufio.NewReader(os.Stdin)
	fmt.Println("Enter a string:")

	// Read the input until the newline character
	input, err := reader.ReadString('\n')
	if err != nil {
		fmt.Println("Error reading input:", err)
		return
	}

	// Trim the newline character from the end
	str = strings.TrimSpace(input)
	// Replace spaces with empty string
	str = strings.ReplaceAll(str, " ", "")
	// Convert to lower case
	str = strings.ToLower(str)
	// Remove special characters
	str = removeSpecialCharacters(str)

	if checkStringPalindrome(str) {
		fmt.Println(str, "is Palindrome")
	} else {
		fmt.Println(str, "is not Palindrome")
	}

	var number uint64
	fmt.Println("Enter a number(without space): ")
	_, err = fmt.Scanln(&number)
	if err != nil {
		log.Fatalf("Error reading input: %v\n", err)
		return
	}

	if checkNumberPalindrome(number) {
		fmt.Println(number, "is Palindrome")
	} else {
		fmt.Println(number, "is not Palindrome")
	}

}
```