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C++ – Pointer to Structure

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  • Last Updated : 07 Oct, 2022
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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 <iostream>
 
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 <iostream>
#include <stdio.h>
 
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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