Determining if user input is palindrome with C++ - c++

Question

First of all, I very much appreciate any help you are willing to provide. I am new to C++ and have been scouring this website as well as other resources for the solution to my problem.
Further, this was indeed a portion of a homework assignment. However, the assignment has been turned in (upsettingly, without getting this code to work). It would be great to get an explanation for what the problem in my specific code is and how to fix my current code, rather than the just rewritten code with a different way to approach to problem. I certainly found plenty of ways to solve this problem on this wonderful site!
I am getting no errors with my code, however the reversal output is not showing the reversed character array. This results in my little program here always showing "Your string is not a palindrome! :(" no matter what the input is.
#include <iostream>
#include <string>
using namespace std;
int isPalindrome(char *input, char *input2);
char reverseString(char *input);
int main ()
{
char input[50];
char input2[50];
cout << "Please enter a string of characters no larger than 50." << endl;
cin.getline(input, 50);
reverseString(input);
cout << "The reversed string is " << input2 << endl;
int result;
result = isPalindrome(input, input2);
if(result == 0)
cout << "Your string is a palindrome!" << endl;
else
cout << "Your string is not a palindrome! :( " << endl;
return 0;
}
int isPalindrome(char* first, char* second)
{
if (*first == *second)
return 0;
else
return 1;
}
char reverseString(char* input2)
{
int size = sizeof(input2);
for (int i = 0; i < (size/2); i ++)
swap(input2[i], input2[size-i-1]);
return *input2;
}
Again, I appreciate any help you can provide! I apologize if this is a simple error that I am overlooking and should have been able to find elsewhere.

Answer 1

Checking for a palindrome does not take this much effort.
bool isPalindrome(const char* s) // this function is self-contained.
{ // the caller does not need to provide
size_t n = strlen(s); // any pre-computed value.
if (n == 0)
return false;
const char* e = s + n - 1;
while (s < e)
if (*s++ != *e--)
return false;
return true;
}
int main ()
{
char input[50];
cout << "Please enter a string of characters no larger than 50." << endl;
cin.getline(input, 50);
bool result = isPalindrome(input);
cout << "Your string is"
<< ((result) ? " " : " not ")
<< "a palindrome!\n";
return (result) ? 1 : 0;
}
In your reverseString function:
char reverseString(char* input2)
{
int size = sizeof(input2); // <-- ?? sizeof(char*) != strlen(input2)
size_t size = strlen(input2); // <-- should read.
for (int i = 0; i < (size/2); i ++)
swap(input2[i], input2[size-i-1]);
return *input2; // what's this? returning first char? why?
}