Notice: This page requires JavaScript to function properly.
Please enable JavaScript in your browser settings or update your browser.Impara Void | Pointers
C Basics
course content

Contenuti del Corso

C Basics

C Basics

1. Introduction
Structure of the C-ProgramEssentials of C ProgramHow to Run the Program?
2. Data
DataVariablesPrintfIntroduction to ArraysTwo Dimensional ArraysChar and StringSizeofPrintf PracticeSizeof Practice
3. Operators
Assignment, Comparison, Not Equal ToSum, Difference, Increment, DecrementMultiplication, Division and ModuloComparison OperatorsComparison Operators PracticeLogical OperatorsLogical Operators Practice
4. Control Statements
If-else Operatorif-else Operator PracticeTernary OperatorSwitch, BreakWhile, Do-WhileFor, ContinueFor Loop Practice
5. Functions
Structure of the FunctionDeclaration, Type and ReturnArgumentsPassing ArgumentsHeader, Prototypes Void, Recursion
6. Pointers
Pointers are around UsReferences and DereferencesPointersMalloc and FreeFunctions, Arrays and Two PointersVoid

book
Void

We've previously encountered void when we looked at functions that don't return anything or just display text on the screen.

Keep in mind that we can't declare a variable of the void type. However, we can create a void* pointer that points to a memory location.

Note

If you've worked through the pointer exercises in the section, you'll know that all pointers occupy 8 bytes. A void* pointer is no different.

A void* pointer isn't tied to any specific data type. This flexibility allows us to store the address of any data type in it.

However, there's a catch: we can't dereference a void* pointer.

Note

This limitation stems from the same reason we can't declare variables of the void type.

Perform an explicit type conversion!

Main.c

Main.c

copy

              
123456789101112131415161718192021

            
#include <stdio.h>

int main()
{
    char c = 'F';
    int i = 100;
    double d = 3.15;

    void* pV;

    pV = &c;
    printf("%c \n", *((char*)pV));

    pV = &i;
    printf("%d \n", *((int*)pV));

    pV = &d;
    printf("%.2f \n", *((double*)pV));

    return 0;
}

Congratulations on completing the basic course in C programming! If you're eager to dive deeper into this fascinating and logical programming language, I highly recommend delving into topics like macros, sorting algorithms, and data structures. Additionally, familiarizing yourself with one of the Linux distributions is invaluable for any seasoned C programmer.

Best of luck!

question mark

How do you retrieve the value of a void pointer?

Select the correct answer

Tutto è chiaro?

Come possiamo migliorarlo?

Grazie per i tuoi commenti!

Sezione 6. Capitolo 6

Chieda ad AI

expand

Chieda ad AI

ChatGPT

Chieda pure quello che desidera o provi una delle domande suggerite per iniziare la nostra conversazione

course content

Contenuti del Corso

C Basics

C Basics

1. Introduction
Structure of the C-ProgramEssentials of C ProgramHow to Run the Program?
2. Data
DataVariablesPrintfIntroduction to ArraysTwo Dimensional ArraysChar and StringSizeofPrintf PracticeSizeof Practice
3. Operators
Assignment, Comparison, Not Equal ToSum, Difference, Increment, DecrementMultiplication, Division and ModuloComparison OperatorsComparison Operators PracticeLogical OperatorsLogical Operators Practice
4. Control Statements
If-else Operatorif-else Operator PracticeTernary OperatorSwitch, BreakWhile, Do-WhileFor, ContinueFor Loop Practice
5. Functions
Structure of the FunctionDeclaration, Type and ReturnArgumentsPassing ArgumentsHeader, Prototypes Void, Recursion
6. Pointers
Pointers are around UsReferences and DereferencesPointersMalloc and FreeFunctions, Arrays and Two PointersVoid

book
Void

We've previously encountered void when we looked at functions that don't return anything or just display text on the screen.

Keep in mind that we can't declare a variable of the void type. However, we can create a void* pointer that points to a memory location.

Note

If you've worked through the pointer exercises in the section, you'll know that all pointers occupy 8 bytes. A void* pointer is no different.

A void* pointer isn't tied to any specific data type. This flexibility allows us to store the address of any data type in it.

However, there's a catch: we can't dereference a void* pointer.

Note

This limitation stems from the same reason we can't declare variables of the void type.

Perform an explicit type conversion!

Main.c

Main.c

copy

              
123456789101112131415161718192021

            
#include <stdio.h>

int main()
{
    char c = 'F';
    int i = 100;
    double d = 3.15;

    void* pV;

    pV = &c;
    printf("%c \n", *((char*)pV));

    pV = &i;
    printf("%d \n", *((int*)pV));

    pV = &d;
    printf("%.2f \n", *((double*)pV));

    return 0;
}

Congratulations on completing the basic course in C programming! If you're eager to dive deeper into this fascinating and logical programming language, I highly recommend delving into topics like macros, sorting algorithms, and data structures. Additionally, familiarizing yourself with one of the Linux distributions is invaluable for any seasoned C programmer.

Best of luck!

question mark

How do you retrieve the value of a void pointer?

Select the correct answer

Tutto è chiaro?

Come possiamo migliorarlo?

Grazie per i tuoi commenti!

Sezione 6. Capitolo 6
some-alt