#include <iostream.h>

int main(int argc, char *argv[])
{
   int      a;
   int    * p;   // variable p holds an address of an int variable

   a = 4;

   cout << "a = " << a << "\n";

   p = &a;       // &a = the address of the integer variable a
                 // So: assign the address of the integer variable a to p
                 // p now contains the address of the integer variable a
                 // We say: p "points to" a

   *p = 1234;    // Put the value 1234 into the (integer) variable
                 // pointed to by p

   cout << "a = " << a << "\n";

   *p = *p + 10000;

   cout << "a = " << a << "\n";
}