C Void Pointer

Syntax

void *ptr;

Example

#include<stdio.h>

int main() {
    int number = 10;
    void *ptr = &number;

    printf("Value of number: %d\n", *((int*)ptr));

    return 0;
}

Output

Value of number: 10

Explanation

In the C programming language, a void pointer is a pointer that has no associated data type. It is used to store an address of any data type, and is often cast back to its original data type when accessed.

Use

Void pointers are commonly used in C programming for general-purpose storage of memory addresses. They are also used in functions that may accept data of any type, such as sorting algorithms and search functions.

Important Points

• Void pointers can point to any type of data, but the data must be cast to a specific type before it can be accessed.
• Dereferencing a void pointer without first casting it to a specific type will result in a compilation error.
• Void pointers are often used to provide a generic memory interface to functions that can operate on any type of data.

Summary

Void pointers are an essential aspect of low-level programming in C, providing a mechanism for generic storage and flexible function interfaces. They allow for a high degree of flexibility and abstraction in programming, enabling developers to create more efficient and flexible software. However, they require a good understanding of pointer manipulation and memory management, and should be used judiciously to avoid issues such as memory leaks and segmentation faults.