Question

the question is

A palindrome is a string that is read the same in both directions, for example, racecar, eye, etc. Write a program in
that prompts the user to enter a string and uses a recursive function to determine if the given input is a palindrome

i have done this so far but its not working guys :

#include<stdio.h>
#include<conio.h>
#include<string.h>// to save string

int isPalindrome(char*str);

int main (void)
{
    int result;
    char str[50];

    printf("\n pls enter string; \n");
    gets(str);
    result = isPalindrome(str);

    if(result ==1) 
    {
        printf("\n input string in a palindrome string ");
    }
    else
    {
        printf(" not a palindrome");
    }

    getch();

    return 1;
}

int isPalindrome(char*str)
{
    static int length = strlen(str);

    if(length<1)
    {
        return 1;
    }

   if(str[0]=str[lenght - 1])
   {
       length-=2;
   }

   return isPalindrome(str + 1)
}


{
     return 0;
}

Answer 1

Since you tagged your question as C++, this approach would work:

#include <string>
#include <algorithm>
#include <iostream>

bool isPalindrome(const std::string& str)
{
    // comparison based on 2 string iterators - a "normal" one
    // and a reversed one
    return std::equal(str.rbegin(), str.rend(), str.begin());
}

int main()
{
    std::cout << isPalindrome("racecar") << std::endl; // prints 1
    std::cout << isPalindrome("truck") << std::endl; // prints 0
}