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C Structs

bookPointers 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:

struct <name_of_struct>
{
    <field_of_struct>;
};

struct <name_of_struct>* <name_of_pointer>;

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.c

main.c

copy

              
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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;
}
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Swipe to start coding

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

Lösning

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bookPointers to Structs

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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:

struct <name_of_struct>
{
    <field_of_struct>;
};

struct <name_of_struct>* <name_of_pointer>;

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.c

main.c

copy

              
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;
}
Uppgift

Swipe to start coding

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

Lösning

Switch to desktopByt till skrivbordet för praktisk övningFortsätt där du är med ett av alternativen nedan
Var allt tydligt?

Hur kan vi förbättra det?

Tack för dina kommentarer!

close

Awesome!

Completion rate improved to 4.17
Avsnitt 2. Kapitel 2
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