Void
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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
voidtype.
Perform an explicit type conversion!
Main.c
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!
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