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C Basics

bookUnderstanding the void Pointers

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When you first saw void, it referred to functions that return nothing. You canโ€™t create a variable of type void, but you can declare a void* pointer that holds the address of any data type.

Note
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 you to store the address of any data type in it. However, there's a catch: you can't dereference a void* pointer.

Note
Note

This limitation stems from the same reason you can't declare variables of the void type. Perform an explicit type conversion!

Main.c

Main.c

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#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 C programming basics! To advance further, explore topics like macros, sorting algorithms, and data structures. Learning a Linux distribution will also help you grow as a skilled C programmer.

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How do you retrieve the value of a void pointer?

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Sectionย 6. Chapterย 6

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Sectionย 6. Chapterย 6
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