Pointers to Structs

The C programming language allows you to create pointers not only to regular data types but also to structures (since a structure is a custom data type).

Declaration and initialization of a pointer looks like this:

python

If <name_of_pointer> is a pointer to a structure,
then *(<name_of_pointer>) is the structure itself.

To access the fields of a structure through a pointer, you must use the -> operator.

Note

"->" is an analogue of the structure access operator .

main


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#include <stdio.h>

// structure declaration
struct Point {
    int x;
    int y;
};

int main() {
    // create a structure variable of Point type
    struct Point p1;
    p1.x = 10;
    p1.y = 20;

    // create a pointer to a structure of type Point and assign it the address of variable p1
    struct Point* ptr = &p1;

    // Access structure members via pointer by `->` operator
    printf("Coordinates: (%d, %d)\n", ptr->x, ptr->y);

    return 0;
}

Opgave

Swipe to start coding

Declare structure Human which contains two fields name and age;
Initialize the structure worker and fill the fields;
Declare and initialize a pointer ptr to a worker;
Display information about the worker.

Løsning

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Sektion 2. Kapitel 2

Pointers to Structs

The C programming language allows you to create pointers not only to regular data types but also to structures (since a structure is a custom data type).

Declaration and initialization of a pointer looks like this:

python

If <name_of_pointer> is a pointer to a structure,
then *(<name_of_pointer>) is the structure itself.

To access the fields of a structure through a pointer, you must use the -> operator.

Note

"->" is an analogue of the structure access operator .

main


              12345678910111213141516171819202122
            
#include <stdio.h>

// structure declaration
struct Point {
    int x;
    int y;
};

int main() {
    // create a structure variable of Point type
    struct Point p1;
    p1.x = 10;
    p1.y = 20;

    // create a pointer to a structure of type Point and assign it the address of variable p1
    struct Point* ptr = &p1;

    // Access structure members via pointer by `->` operator
    printf("Coordinates: (%d, %d)\n", ptr->x, ptr->y);

    return 0;
}

Opgave

Swipe to start coding

Declare structure Human which contains two fields name and age;
Initialize the structure worker and fill the fields;
Declare and initialize a pointer ptr to a worker;
Display information about the worker.

Løsning

Skift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder

Var alt klart?

Tak for dine kommentarer!

Sektion 2. Kapitel 2

Skift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder