Pointers and references

#include <cstdio>
#include <new>

//typedef demo
typedef int *pint;

//typedef pint apint[]; OR
typedef int *apint[];



int main() {
  //Const and cast
  {
    const int *cpi = new int[10];

    int *pi = (int*)cpi;

    //cpi[0] = 10; //Error;
    pi[0] = 10;
    printf("%d\n", cpi[0]);
    delete[] cpi;
  }

  // Jagged array
  {
    apint a = {new int[10], new int[11]};

    a[0][0]; //to
    a[0][9];

    a[1][0]; //to
    a[1][10];

    for (int i = 0; i < 2; ++i)
      delete[] a[i];
  }

  //Null pointer
  {
    int *p1 = nullptr; //OR
    int *p2 = 0; //OR
    int *p3 = NULL; //OR
  }

  // Reference pointer
  {
    int i = 10;
    int &li = i;

    ++li;
    printf("%d\n", i);
  }

  // Anti-example with pointers
  {
    int *pi;
    {
      int i = 42;
      pi = &i;
    }

    int &li = *pi; //Link to ???

    ++li;
    printf("%d\n", li); //May be 43, but may be not...
    //printf("%d\n", i); //Just error
  }



  return 0;
}