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C Structs

bookPointers 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;
}
Aufgabe

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.

Lösung

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bookPointers Brief Overview

Swipe um das Menü anzuzeigen

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;
}
Aufgabe

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.

Lösung

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War alles klar?

Wie können wir es verbessern?

Danke für Ihr Feedback!

close

Awesome!

Completion rate improved to 4.17
Abschnitt 2. Kapitel 1
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single

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