Question: Why Size Of Pointer Is 4 Byte?

What is a void pointer?

The void pointer in C is a pointer which is not associated with any data types.

It points to some data location in the storage means points to the address of variables.

It is also called general purpose pointer.

In C, malloc() and calloc() functions return void * or generic pointers..

What is pointer size?

show 1 more comment. 23. On 32-bit machine sizeof pointer is 32 bits ( 4 bytes), while on 64 bit machine it’s 8 byte. Regardless of what data type they are pointing to, they have fixed size.

What does 4 bytes mean?

4 bytes can store numbers between -2147483648 and 2147483647. 8 bytes can store numbers between -9223372036854775808 and 9223372036854775807.

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.

Is Size Of pointer fixed?

The size of a pointer in C/C++ is not fixed. It depends upon different issues like Operating system, CPU architecture etc. Usually it depends upon the word size of underlying processor for example for a 32 bit computer the pointer size can be 4 bytes for a 64 bit computer the pointer size can be 8 bytes.

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.

Why is pointer size 4 bytes in C?

Explanation: Size of an array is number of elements multiplied by the type of element, that is why we get sizeof arri as 12 and sizeof arrc as 3. Size of a pointer is fixed for a compiler. All pointer types take same number of bytes for a compiler. That is why we get 4 for both ptri and ptrc.

What does Dereferencing mean?

Dereferencing is used to access or manipulate data contained in memory location pointed to by a pointer. *(asterisk) is used with pointer variable when dereferencing the pointer variable, it refers to variable being pointed, so this is called dereferencing of pointers.

Why is an int 4 bytes?

On 16-bit systems (like in arduino), int takes up 2 bytes while on 32-bit systems, int takes 4 bytes since 32-bit=4bytes but even on 64-bit systems, int occupies 4 bytes. For backwards compatibility, most compilers consider int to be 32 bits or sometimes 16 bits. …

Why size of pointer is 2 byte?

2 Answers. The size of a void* pointer is the address size of the CPU, as it has to be able to hold any possible memory address. For a 64-bit system, it has to be (at least) 64 bits.

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.

How many bytes is 4 numbers?

3. 1 Integers. Integers are commonly stored using a word of memory, which is 4 bytes or 32 bits, so integers from 0 up to 4,294,967,295 (232 – 1) can be stored. Below are the integers 1 to 5 stored as four-byte values (each row represents one integer).

Why int is 2 or 4 bytes?

So the reason why you are seeing an int as 4 bytes (32 bits), is because the code is compiled to be executed efficiently by a 32-bit CPU. If the same code were compiled for a 16-bit CPU the int may be 16 bits, and on a 64-bit CPU it may be 64 bits.

Are all pointers the same size?

The pointer variable size are all the same size as the memory address. The pointers do contain the address of one memory cell that as its size, that is the first r the last byte of a piece of data in memory. … The size of a pointer sometimes depend on the environment like the machine and the compiler.

How many bytes is a pointer?

8 bytesPointers are blocks of memory (8 bytes on 64-bit machines) that reference memory addresses of any data type in C. Pointers are declared using the * character.