1 class

#include <iostream>

using namespace std;

int main() {

  // Declaring and Initializing Constant

  const int con1 = 5;

  const int con2 = 12;

  // Declaring Variable

  int var1;

  int var2;

  // Initializing Variables

  var1 = 5;

  var2 = 12;

  // Changing Variable Values

  var1 = 10;

  var2 = 20;

  cout << "First Constant = " << con1 << "\n";

  cout << "Second Constant = " << con2 << "\n";

  cout << "First Variable = " << var1 << "\n";

  cout << "Second Variable = " << var2;

}