Help in debugging [Solved]

Question

#include <iostream>
#include <math.h>
#include <algorithm>
using namespace std;
int main() {
string str,new_str ;
cin>>str;
new_str = reverse(str.begin(), str.end());
if (new_str == str)
{
cout << str << " is a palindrome."
}
else {
cout << str << " is not a palindrome."
}
return 0;
}

Showing Error in "line 8"

Answer 1

std::reverse() reverses the sequence in-place and doesn't return anything, hence trying to assign void to "new_str" is faulty:

https://en.cppreference.com/w/cpp/algorithm/reverse

If you need to construct a reversed sequence while leaving the original one as is, you should have a look at std::reverse_copy() instead:

https://en.cppreference.com/w/cpp/algorithm/reverse_copy

Note std::reverse_copy() will require the output range to at least have the same size as the input range, seeing that "new_str" is currently empty. Using a string constructor and reverse iterators, you can create the reversed string directly without any external function:

string new_str{ str.crbegin(), str.crend() };