Is it necessary that pointer and variable datatype should be same?

Is it necessary that pointer and variable datatype should be same?

The reason why you need the data type for pointers is because the compiler has to know what the size of the memory cell is, among others, the pointer is pointing to. Also type safety cannot be ensured w/o the type. Also, you would have to typecast every pointer when accessing structures from the pointer.

Can a pointer point to a different data type?

The pointers can point to any type if it is a void pointer. but the void pointer cannot be dereferenced. only if the complier knows the data type of the pointer variable, it can dereference the pointer and perform the operations.

Is pointer a data type or variable?

It is datatype or not? Pointers are simply a variable that hold an address so one could argue that a pointer is a data type, but it is not defined as a data type (per “The C Programming Language”.

What should be the data type of pointer?

data type of *p is pointer. And it points to integer type variable. It stores address in hexadecimal format. Pointers to any datatype either it may be of char/int/float/double/… are unsigned integers only.

Why do we need pointer types?

Defining the type of pointers helps the compiler find errors where you are trying to use data of the wrong type through a pointer. That’s the reason C has types in the first place. The compiler needs to know the types pointed at otherwise all sorts of code won’t work.

What is the correct way to declare a pointer?

Pointers must be declared before they can be used, just like a normal variable. The syntax of declaring a pointer is to place a * in front of the name. A pointer is associated with a type (such as int and double) too.

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. Some Interesting Facts: 1) void pointers cannot be dereferenced. For example the following program doesn’t compile.

How do you turn a pointer into a variable?

The “address of” operator This is the best way to attach a pointer to an existing variable: int * ptr; // a pointer int num; // an integer ptr = &num // assign the address of num into the pointer // now ptr points to “num”!

Is pointer a built in data type?

A pointer is not a data type, it’s just an integer (in C). Pointer in general is just an address.

What is the type of pointer variable?

A pointer variable (or pointer in short) is basically the same as the other variables, which can store a piece of data. Unlike normal variable which stores a value (such as an int, a double, a char), a pointer stores a memory address. Pointers must be declared before they can be used, just like a normal variable.

What is the size of pointer?

Pointers generally have a fixed size, for ex. on a 32-bit executable they’re usually 32-bit. There are some exceptions, like on old 16-bit windows when you had to distinguish between 32-bit pointers and 16-bit…

What is the size of near pointer?

Near pointer is a pointer which is used to bit address of up to 16 bits in a given section of the computer memory that is 16 bit enabled. It can only access data of a small size of about 64 kb in a given period, which is the main disadvantage of this.

Why do Variable pointers contain the address of the same data type?

A pointer is a variable whose value is the address of another variable, i.e., direct address of the memory location. Like any variable or constant, you must declare a pointer before you can use it to store any variable address. The data type of pointer must be same as the variable, which the pointer is pointing.

What is the datatype of pointer in C?

By contrast, C provides a variety of data types. The fundamental types are characters, and integers and floating point numbers of several sizes. In addition, there is a hierarchy of derived data types created with pointers, arrays, structures, and unions.

Which is the data type of PTR pointer?

ptr is a pointer object, and its type is int*, which is a pointer type. The body of your question asks whether “a pointer is a data type or not”. By any reasonable definition of the phrase “data type”, pointer types are data types.

What’s the difference between a pointer and a void?

They’re pointers, whose size is system-dependent and whose only compatible type is void*. Pointers are of pointer type. If you’re asking about how pointer values are represented in memory, that really depends on the platform.