How do I write a C++ program to check whether the string is palindrome or not without using inbuilt functions?

Palindrome.jpg

What is Palindrome?
According to Wikipedia:

A palindrome is a word, number, phrase, or other sequences of characters which reads the same backward as forward, such as madam or racecar or the number 10801. Sentence-length palindromes may be written when allowances are made for adjustments to capital letters, punctuation, and word dividers, such as "A man, a plan, a canal, Panama!", "Was it a car or a cat I saw?" or "No 'x' in Nixon".

Let's watch a video which explains the concept of this :


Now, let's jump into the code that will implement this in C++ Langauge:

	#include <iostream>
	int calculateLength(char *input){
	int i = 0;
	while (input[i]){
	i++;
	}
	return i;
	}
	int main(){
	char input[100]; //Getting Input from User upto 100 chars
	std::cout << "Please input the string/number [Note: Max 100 characters allowed]:";
	std::cin >> input;
	int length = calculateLength(input);
	int lastIndex = length - 1;
	bool isPalindrome = true;
	for (int i = lastIndex; i >= length / 2; i--){
	if (input[i] != input[lastIndex - i]){
	isPalindrome = false;
	break;
	}
	}
	if (isPalindrome){
	std::cout << ":) Its a Palindrome" << std::endl;
	}else{
	std::cout << ":( Its Not palindrome" << std::endl;
	}
	return 0;
	}

view raw PalindromeWithOutInBuiltFunction.cpp hosted with ❤ by GitHub

Kepp Coding and Kepp Learning :)