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Before you apply pointer arithmetic in void pointers make sure to provide a proper typecast first otherwise you may get unexcepted results. In my case, the integer size is 4 byte.Application of void pointers are very wide, we can not cover all the application in one article.

(void)(foo); It's not a void pointer cast - that would be straightforward.

Or does it actually do anything? Let me show you what I mean. Reason 1 : Re-usability of Pointer Consider the given example # include < stdio.h > //function prototype void printString (void * ptr); int main {char * str = " Hi, there! So we have to typecast the void pointer pvData from the pointer to int (int*) before performing an arithmetic operation.You can see, showing the correct value.
This also works for C language. The following program demonstrates pointer arithmetic in void pointers.The void pointers are used extensively in dynamic memory allocation which we will discuss next.// wrong since type of fp is pointer to float [/box] Why it is necessary to use Void Pointer ? I have working experience of different microcontrollers (stm32, LPC, PIC AVR and 8051), drivers (USB and virtual com-port), POS device (VeriFone) and payment gateway (global and first data). Is this just a no-op to prevent the function from being optimized away? Although some compilers allow deleting a void pointer that points to dynamically allocated memory, doing so should be avoided, as it can result in undefined behavior. In this chapter we will be learning Dereferencing Void Pointer in C Programming. A pointer can be null. You already know how to dereference an integer pointer using an indirection operator (*).Now you will get the value of the integer which addresses pointed by the void pointer.A very important feature of the void pointer is reusability. C standard explicitly says that void * is compatible with any pointer type. In the last chapter we have learnt about void pointer. In this article, we will learn what is void pointer in C and how we can use void pointer in our C code. So to access the value of integer variable (iData) through the void pointer we have to typecast void pointer through the integer pointer.Now above expression behave like an integer pointer. I am an embedded c software engineer and a corporate trainer, currently, I am working as senior software engineer in a largest Software consulting company . The following program demonstrates how to dereference a Another important point I want to mention is about pointer arithmetic with void pointer.

Toutefois, vous pouvez utiliser un cast pour convertir un pointeur void en n'importe quel autre type pointeur, et inversement.
Using the qsort function, we can sort the array of integer, double, long, etc.void qsort(void *arr, size_t elements, size_t size, int (*comp)(const void *, const void*));In this example code, I am showing how is the qsort function sort any type of array with the help of compare function.But with proper typecasting, we can dereference the void pointer and get back the value of the pointed address.You can see how memcpy is working here as a generic copy function with the help of a void pointer.Great article with an in-depth insight into the usage of void pointers. The void type of pointer is a special type of pointer. It is not possible to do pointer arithmetic on a void pointer.

It looks like an rvalue without an lvalue. Applying the indirection operator to a null pointer causes an implementation-defined behavior.

Several respectful C programmers, for example Linus Torvalds, and enterprises such as GNU argue against this casting and call it bad practice as it decreases readability. So you should perform proper typecasting on the void pointer before performing the arithmetic operation.When you will run the above code you will get the unexpected result.Since the array (aiData) is the collection of integer element so the type of &aiData[0] would be a pointer to int (int*). This is a very interesting feature of the void pointer that makes the programmer helpless to use the void pointer.Here I want to mention an important point about the arithmetic operation on a void pointer. A pointer can be null. Before you dereference a void pointer it must be typecasted to appropriate pointer type. According to C standard, the The size of a void pointer is similar to the size of the character pointer. In C++, void represents the absence of type, so void pointers are pointers that point to a value that has no type (and thus also an undetermined length and undetermined dereference properties).