C++ – Pointer to Structure

• Last Updated : 07 Oct, 2022

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. Below is an example of the same:

Syntax:

```struct name_of_structure *ptr;

// Initialization of structure is done as shown below

ptr = &structure_variable;```

Example 1:

C++

 `// C++ program to demonstrate Pointer to Structure` `#include `   `using` `namespace` `std;`   `struct` `point {` `    ``int` `value;` `};`   `int` `main()` `{`   `    ``struct` `point g;` `    ``// Initialization of the structure pointer` `    ``struct` `point* ptr = &g;`   `    ``return` `0;` `}`

In the above code g is an instance of struct point and ptr is the struct pointer because it is storing the address of struct point.

Example 2:

C++

 `// C++ program to Demonstrate Pointer to Structure` `#include ` `#include `   `using` `namespace` `std;`   `// Structure declaration for` `// vertices` `struct` `GFG {` `    ``int` `x;` `    ``int` `y;` `};`   `// Structure declaration for` `// Square` `struct` `square {`   `    ``// An object left is declared` `    ``// with 'GFG'` `    ``struct` `GFG left;`   `    ``// An object right is declared` `    ``// with 'GFG'` `    ``struct` `GFG right;` `};`   `// Function to calculate area of` `// the given Square` `void` `area_Square(``struct` `square s)` `{` `    ``// Find the area of the Square` `    ``// using variables of point` `    ``// structure where variables of` `    ``// point structure is accessed` `    ``// by left and right objects` `    ``int` `area = (s.right.x) * (s.left.x);`   `    ``// Print the area` `    ``cout << area << endl;` `}`   `// Driver Code` `int` `main()` `{` `    ``// Initialize variable 's'` `    ``// with vertices of Square` `    ``struct` `square s = { { 4, 4 }, { 4, 4 } };`   `    ``// Function Call` `    ``area_Square(s);`   `    ``return` `0;` `}`

Output

`16`

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