What is the difference between null and void pointers?
A null pointer is basically a null value assigned to a pointer of any data type whereas a void pointer is a data type which remains void as long as an address of a data type is not assigned to it. The data type of the pointer is nothing but the type of data stored at the memory location where the pointer is pointed.
What is the difference between void and null pointers .give suitable examples in support of your answer?
Conceptually, when a pointer has that null value it is not pointing anywhere. 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.
Is void pointer and null pointer same?
The difference between Null pointer and Void pointer is that Null pointer is a value and Void pointer is a type.
What is the difference between null pointer and wild pointer?
Null pointer is a pointer which is pointing to nothing. Null pointer points to empty location in memory. Uninitialized pointers are called as wild pointers in C which points to arbitrary (random) memory location. This wild pointer may lead a program to behave wrongly or to crash.
What is generic pointer?
When a variable is declared as being a pointer to type void it is known as a generic pointer. Since you cannot have a variable of type void, the pointer will not point to any data and therefore cannot be dereferenced. Hence the term Generic pointer.
Which pointer does not exist?
NULL Pointer is a pointer which is pointing to nothing. In case, if we don’t have address to be assigned to a pointer, then we can simply use NULL.
Can a pointer be void?
A void pointer is a pointer that has no associated data type with it. A void pointer can hold address of any type and can be typcasted to any type. Some Interesting Facts: 1) void pointers cannot be dereferenced.
Which of the following is generic pointer?
A void pointer is a special pointer that can point to object of any type. A void pointer is typeless pointer also known as generic pointer.
What is a void * pointer?
A void pointer is a pointer that has no associated data type with it. A void pointer can hold address of any type and can be typcasted to any type.
What can’t you do on a void pointer?
Explanation: Because the void pointer is used to cast the variables only, So pointer arithmetic can’t be done in a void pointer.
What is string * x y?
string* x, y; a) x is a pointer to a string, y is a string. b) y is a pointer to a string, x is a string. c) both x and y are pointers to string types. d) y is a pointer to a string.
What’s the difference between null pointer and void pointer?
The difference between Null pointer and Void pointer is that Null pointer is a value and Void pointer is a type. NULL pointer. A null pointer means it is not pointing to anything. If, there is no address that is assigned to a pointer, then set it to null. A pointer type, i.e., int *, char * each have a null pointer value. The syntax is as follows −
What kind of pointer is a void PTR?
A void *ptr is the pointer which can be used to point any type of data. It maybe int, float, double. It has no return type that is initially pointer is created with pointer type (having hex value) and we can assign this pointer to any type of data.
What does it mean when malloc returns a null pointer?
Another example, If malloc can’t allocate memory, it returns a null pointer. So, we can check the pointer by comparing with NULL, if a valid memory is allocated. Also, check to free a valid memory etc. Dangling pointer in C and C++ is a pointer pointing to memory location which is deleted or freed , but still has the invalid address.
Why is a null pointer called a dangling pointer?
Don’t initialize the pointer with some defined value e.g. NULL then it will contain some address which is invalid location now. Now, this pointer is called dangling pointer. If we process this pointer further in the program then the program will crash as it will not find valid memory.