#include<iostream>
using namespace std;

struct Example
{
    int a;
    Example(int b);
    void printA();
};

Example::Example(int b)
{
    a = b;
}

void Example::printA()
{
    cout << "a = " << a<<endl;
}

int main(){
  Example *ex1, ex2(3);
  ex1=new Example(12);
  /* ex1 is dynamically instantiated and memory allocated at runtime, while memory for ex2 is allocated at comppile time */
  ex1->printA();
  //ex1.printA();  Will not compile
  ex2.printA();
  delete ex1; /* only ex1 needs to be explicitly deleted, since it's dynamically allocated. */
}