Program by using the concept of Pointer

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// Program by using the concept of Pointer
#include<iostream.h.h>
#include<conio.h>

int main ()
{
  int firstvalue = 5,secondvalue = 15;
  int * p1, * p2;
  p1 = &firstvalue;  // p1 = address of firstvalue
  p2 = &secondvalue; // p2 = address of secondvalue
  *p1 = 10;          // value pointed by p1 = 10
  *p2 = *p1;         // value pointed by p2 = value pointed by p1
  p1 = p2;           // p1 = p2 (value of pointer is copied)
  *p1 = 20;          // value pointed by p1 = 20
 
  cout << "firstvalue is " << firstvalue << endl;
  cout << "secondvalue is " << secondvalue << endl;
  return 0;
}
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