Pointer to Pointer or Double Pointer Example Program In C++
Definition
- Pointer to Pointer locates/store to another pointer variable address.
- The dereference operator or indirection operator, noted by an asterisk ("*"), is also a unary operator in c languages that uses for pointer variables.
- Double Pointer or Pointer to Pointer need to place a ** before the name of the double pointer.
Syntax
data_type **pointer_variable;
Pointer to Pointer or Double Pointer Example Program
/*
Pointer to Pointer locates/store to another pointer variable address.
The dereference operator or indirection operator, noted by asterisk ("*"), is also a unary operator in c languages that uses for pointer variables.
Double Pointer or Pointer to Pointer need to place an ** before the name of double pointer.
*/
/*##C++ Pointer to Pointer or Double Pointer Example Program with Reference operator (&) and Double Dereference operator (**)*/
/*##Simple Pointer C++ Programs,C++ Pointer to Pointer,C++ Double Pointer*/
// Header Files
#include <iostream>
#include<conio.h>
using namespace std;
int main() {
int var;
//Pointer Variable Declaration for Integer Data Type
int *pt;
//Double Pointer Variable Declaration with Double Dereference operator (**)
int **dp;
cout << "Pointer Example C++ Program : Pointer to Pointer or Double Pointer \n";
var = 100;
cout << "Address of var [&var ] :" << &var << "\n";
cout << "Value of var [var ] :" << var << "\n\n";
//& takes the address of var , Here now pt == &var, so *pt == var
pt = &var;
cout << "Address of Pointer [pt ] :" << pt << "\n";
cout << "Value of Pointer [*pt ] :" << *pt << "\n\n";
//& takes the address of pt , Here now dp == &pt, so *pt == pt and **dp==var
dp = &pt;
cout << "Address of Double Pointer [dp ] :" << dp << "\n";
cout << "Value of Double Pointer [*dp ] :" << *dp << "\n\n";
cout << "Double Pointer Value [**dp] :" << **dp << "\n";
getch();
return 0;
}
Sample Output
Pointer Example C++ Program : Pointer to Pointer or Double Pointer
Address of var [&var ] :0x6ffe34
Value of var [var ] :100
Address of Pointer [pt ] :0x6ffe34
Value of Pointer [*pt ] :100
Address of Double Pointer [dp ] :0x6ffe28
Value of Double Pointer [*dp ] :0x6ffe34
Double Pointer Value [**dp] :100
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