Notice: This page requires JavaScript to function properly.
Please enable JavaScript in your browser settings or update your browser.Lære Pointers Brief Overview | Pointers and Structs
C Structs

Stryg for at vise menuen

book
Pointers Brief Overview

To go through the following chapters, I suggest briefly repeating the pointers in the C programming language.

Note

If you are not familiar with the basic skills of working with the C programming language, we recommend taking our basic C programming language course: C Basic

Dereferencing Operator

A pointer is a variable that contains the address of another object.

Dereference operator "*" returns the value stored at the address.

Declaring and initializing a pointer looks like this:

int* pName = NULL;
main.c

main.c

copy

              
12345678

            
#include <stdio.h>

int main() 
{
    int* pName = NULL;
    printf("%p\n", pName); // `%p` is a specifier for a pointer
    return 0;
}

Referencing Operator &

The "&" operator returns the address of an object:

main.c

main.c

copy

              
12345678

            
#include <stdio.h>

int main() 
{
    int variable;
    printf("%p\n", &variable);
    return 0;
}

A variable of pointer type is used to store the address, which is returned by the & operator.

int variable;
int* pVariable;
pVariable = &variable;

To "unpack" the contents at the specified address, you must use the * operator on a variable of type pointer.

main.c

main.c

copy

              
12345678910

            
 #include <stdio.h>

int main()
{
    int variable = 1024;
    int* pVariable = &variable;
    printf("Address: %p\n", pVariable); // `%p` specifier for a pointer
    printf("Returned value by address: %d\n", *(pVariable)); // using `*` to pointer
    return 0;
}
Opgave

Swipe to start coding

  1. Declare and initialize any variable with any value;
  2. Declare a pointer to the same data type as your variable;
  3. Assign the address of a variable to a pointer;
  4. Display an address of your variable;
  5. Display the value of the variable by the pointer.

Løsning

Switch to desktopSkift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder
Var alt klart?

Hvordan kan vi forbedre det?

Tak for dine kommentarer!

Sektion 2. Kapitel 1
single

single

Spørg AI

expand

Spørg AI

ChatGPT

Spørg om hvad som helst eller prøv et af de foreslåede spørgsmål for at starte vores chat

close

Awesome!

Completion rate improved to 4.17

book
Pointers Brief Overview

To go through the following chapters, I suggest briefly repeating the pointers in the C programming language.

Note

If you are not familiar with the basic skills of working with the C programming language, we recommend taking our basic C programming language course: C Basic

Dereferencing Operator

A pointer is a variable that contains the address of another object.

Dereference operator "*" returns the value stored at the address.

Declaring and initializing a pointer looks like this:

int* pName = NULL;
main.c

main.c

copy

              
12345678

            
#include <stdio.h>

int main() 
{
    int* pName = NULL;
    printf("%p\n", pName); // `%p` is a specifier for a pointer
    return 0;
}

Referencing Operator &

The "&" operator returns the address of an object:

main.c

main.c

copy

              
12345678

            
#include <stdio.h>

int main() 
{
    int variable;
    printf("%p\n", &variable);
    return 0;
}

A variable of pointer type is used to store the address, which is returned by the & operator.

int variable;
int* pVariable;
pVariable = &variable;

To "unpack" the contents at the specified address, you must use the * operator on a variable of type pointer.

main.c

main.c

copy

              
12345678910

            
 #include <stdio.h>

int main()
{
    int variable = 1024;
    int* pVariable = &variable;
    printf("Address: %p\n", pVariable); // `%p` specifier for a pointer
    printf("Returned value by address: %d\n", *(pVariable)); // using `*` to pointer
    return 0;
}
Opgave

Swipe to start coding

  1. Declare and initialize any variable with any value;
  2. Declare a pointer to the same data type as your variable;
  3. Assign the address of a variable to a pointer;
  4. Display an address of your variable;
  5. Display the value of the variable by the pointer.

Løsning

Switch to desktopSkift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder
Var alt klart?

Hvordan kan vi forbedre det?

Tak for dine kommentarer!

close

Awesome!

Completion rate improved to 4.17

Stryg for at vise menuen

some-alt