What is pointer to pointer in C++ with an example?

The syntax simply requires the unary operator (*) for each level of indirection while declaring the pointer. char a; char *b; char ** c; a = 'g'; b = &a; c = &b; Here b points to a char that stores 'g' and c points to the pointer b.1
How to declare pointer to structure in C++?

Here, the address of variable d is stored in the pointer variable ptr , which means ptr is pointing to variable d . Distance* ptr = &d; Then, the member function of variable d is accessed using the pointer. cin >> (*ptr).
What is the ptr in C++?

Pointer ptr is referring directly to the value a, so here ptr will store the address of variable a. &(address-of operator) is used to acquire the address of data stored in variable a. With this, the concept of pointers in C++ and its syntax is clear. So now you will learn about the dereference operator.
How to Declare a Pointer to a Pointer in C ++?

Declaring a Pointer to Pointer is similar to declaring a pointer in C++. The difference is we have to use an additional * operator before the name of a Pointer in C++.
Syntax of a Pointer to Pointer(Double Pointer) in C++:

data_type_of_pointer **name_of_variable = & normal_pointer_variable; Example: int val = 169; int *ptr = &val; // storing address of val to pointer ptr. int **double_ptr = &ptr; // pointer to a pointer declared which is pointing to an integer.
What will be the size of a pointer to a pointer in C++?

In the C++ programming language double pointer behave similarly to a normal pointer. So, the size of the variable of the double-pointer and the size of the normal pointer variable is always equal. Below is a C++ program to check the size of a double pointer:
How to pass a double pointer to a function in C++?

#include <stdio.h> int main(void) { int value = 100; int *value_ptr = &value; int **value_double_ptr = &value_ptr; printf("Value: %d\n", value); printf("Pointer to value: %d\n", *value_ptr); printf("Double pointer to value: %d\n", **value_double_ptr); }
What is the structure of a pointer in C++?

Pointer to structure in C++ can also be referred to as Structure Pointer. A structure Pointer in C++ is defined as the pointer which points to the address of the memory block that stores a structure.
What is the syntax of structure to pointer?

To declare a structure pointer, use the following syntax: struct myStruct *ptr; Here, struct denotes the structure type, myStruct is the structure name, and *ptr declares the structure pointer variable.
What is the operator pointer to structure?

Structure Pointer Operator (->) Use the structure pointer operator to reference individual elements in a structure by means of a pointer variable. The structure pointer operator must appear between the pointer variable name and the element name, with no intervening space.

Requirement

In C++ a Pointer is a variable that is used to store the memory address of other variables. It is a variable that points to a data type (like int or string) of the same type and is created with the * operator.

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In C++ a Pointer is a variable that is used to store the memory address of other variables. It is a variable that points to a data type (like int or string) of the same type and is created with the * operator.

pointer to pointer