- What are pointers useful for?
- What is size of void pointer?
- What is generic pointer?
- Why void is used in C?
- WHAT IS NULL pointer in C?
- What is Dereferencing in C?
- Is a wild pointer?
- What we can do on a void pointer?
- What is void pointer in C with example?
- What is a void * pointer?
- What is null and void pointer?
- What is a void pointer and how do we use it?
What are pointers useful for?
Pointers are used to store and manage the addresses of dynamically allocated blocks of memory.
Such blocks are used to store data objects or arrays of objects.
Most structured and object-oriented languages provide an area of memory, called the heap or free store, from which objects are dynamically allocated..
What is size of void pointer?
The size of void pointer varies system to system. If the system is 16-bit, size of void pointer is 2 bytes. If the system is 32-bit, size of void pointer is 4 bytes. If the system is 64-bit, size of void pointer is 8 bytes.
What is generic pointer?
It make sense to have a pointer type that can hold the address of any data type. When a variable is declared as being a pointer to type void it is known as a generic pointer.
Why void is used in C?
void (C++) When used as a function return type, the void keyword specifies that the function does not return a value. When used for a function’s parameter list, void specifies that the function takes no parameters. When used in the declaration of a pointer, void specifies that the pointer is “universal.”
WHAT IS NULL pointer in C?
A null pointer is a pointer which points nothing. Some uses of the null pointer are: a) To initialize a pointer variable when that pointer variable isn’t assigned any valid memory address yet. b) To pass a null pointer to a function argument when we don’t want to pass any valid memory address.
What is Dereferencing in C?
The dereference operator or indirection operator, sometimes denoted by ” * ” (i.e. an asterisk), is a unary operator (i.e. one with a single operand) found in C-like languages that include pointer variables. It operates on a pointer variable, and returns an l-value equivalent to the value at the pointer address.
Is a wild pointer?
A pointer which has not been initialized to anything (not even NULL) is known as wild pointer. The pointer may be initialized to a non-NULL garbage value that may not be a valid address.
What we can do on a void pointer?
A void pointer can hold address of any type and can be typcasted to any type. Note that the above program compiles in C, but doesn’t compile in C++. In C++, we must explicitly typecast return value of malloc to (int *). 2) void pointers in C are used to implement generic functions in C.
What is void pointer in C with example?
A void pointer is nothing but a pointer variable declared using the reserved word in C ‘void’. When a pointer variable is declared using keyword void – it becomes a general purpose pointer variable. Address of any variable of any data type (char, int, float etc.) can be assigned to a void pointer variable.
What is a void * pointer?
A void pointer is a pointer that can point to any type of object, but does not know what type of object it points to. A void pointer must be explicitly cast into another type of pointer to perform indirection. A null pointer is a pointer that does not point to an address. A void pointer can be a null pointer.
What is null and void pointer?
Null pointer is a special reserved value of a pointer. A pointer of any type has such a reserved value. … Void pointer is a specific pointer type – void * – a pointer that points to some data location in storage, which doesn’t have any specific type. So, once again, null pointer is a value, while void pointer is a type.
What is a void pointer and how do we use it?
Void pointer is a generic pointer that can be used to point another variable of any data type. Void pointer can store the address of variable belonging to any of the data type. So, void pointer is also called as general purpose pointer.