C++ Palindrome algorithm - No match for 'operator<'

Question

My below C++ Palindrome agorithm implementation results in the following error:

No match for 'operator<' (operand types are 'std::basic_ostream< char >' and '< unresolved overloaded function type >')

The error happens on the ending else line.

#include <iostream>
using namespace std;

int main()
{
    cout << "Write a number to check if its palindrome" << endl;
    int a;
    cin >> a;
    int z = a;
    int b;
    int c;
    while (a > 0) {
        b = a % 10;
        c = (c * 10) + b;
        a = a / 10;
    }
    if (z == c) { cout << "This is a palindrome" << endl; }
    else { cout << "This is not a palindrome" < endl; }
    return 0;
}

Answer 1

I got the above error

The last

<endl;

Must be

<<endl;

Be careful reading error messages. They give line number and character position in the line where error occurred.

I could have sworn I looked at the code 10 times.

If you would format your code perfectly, you would find the error quite quickly. For example

#include <iostream>
using namespace std;

int main() {
  cout << "Write a number to check if its palindrome" << endl;
  int a;
  cin >> a;
  int z = a;
  int b;
  int c;
  while (a > 0) {
    b = a % 10;
    c = (c * 10) + b;
    a = a / 10;
  }
  if (z == c) {
    cout << "This is a palindrome" << endl;
  } else {
    cout << "This is not a palindrome" < endl;
  }
  return 0;
}

why it shows me that the number is not a palindrome no matter what I put in it would be useful

You do not initialize c with zero before the loop.