#include <iostream>
using namespace std;
int main() {
int firstvalue = 5, secondvalue = 15;
char thirdvalue = 'a';
int * p1, * p2;
char * p3;
p1 = & firstvalue; // p1 = address of firstvalue
p2 = & secondvalue; // p2 = address of secondvalue
p3 = & thirdvalue; // p3 = address of thirdvalue
* p1 = 10; // value pointed to by p1 = 10
* p2 = * p1; // value pointed to by p2 = value pointed to by p1
p1 = p2; // p1 = p2 (value of pointer is copied)
* p1 = 20; // value pointed to by p1 = 20
* p3 = 'b'; // value pointed to by p3 = ‘b ’
cout << "firstvalue is " << firstvalue << endl;
cout << "secondvalue is " << secondvalue << endl;
cout << "thirdvalue is " << thirdvalue << endl;
return 0;

}

#include <iostream>
using namespace std;
int main() {
int i = 10;
int * p;
p = & i;
cout << "Address of the variable i is " << p << endl;
cout << "Address of the pointer p is " << & p;
return 0;
}