Cách 1:

#include <bits/stdc++.h>
#define int long long
using namespace std;
signed main() 
{
  int n;  cin >> n;
  if (n % 2 == 0) cout << "EVEN";
  else cout <<"ODD";
  return 0;
}

Cách 2:

#include <bits/stdc++.h>
#define int long long
using namespace std;
signed main() 
{
  int n;  cin >> n;
  cout << (n % 2 == 0 ? "EVEN" : "ODD");
  return 0;
}

Chúc bn học tốt!

$\color{Turquoise}{\triangleright \triangleright\ \color{ Turquoise}{\text{ThienPhuc123} \triangleleft \triangleleft}}$

#include <bits/stdc++.h>

using namespace std;

int main() {
    
    long long n;
    cin >> n;
    
    if (n % 2 == 0) cout << "EVEN" << endl;
    else            cout << "ODD"  << endl;
    
    return 0;
}