Type Checking In C++ Pointer | Type Checking In C++ Pointer Types| Type Checking In C++ Pointer Example| Type Checking In C++ Pointer In Hindi

Type Checking In C++ Pointer

In c++ different type of pointer and some are already like pointer they show there behavior according to datatype.

If want to check type checking then we have to use 2 types pointer.

1.Void

2.Null

1.Void

A void pointer is a general-purpose pointer that can hold the address of any data type, but it is not associated with any data type. we cannot assign the address of a variable to the variable of a different data type.

Fig: Void Pointer

Example:

void *p;

Program:

#inlcude<iostream.h>

#include<conio.h>

void main()

{

int a;

void *p;

int b;

cout<<”example of void datatype/n”;

p=&a;

cout<<*(int *)a;

p=&b;

cout<<*(int *)b;

getch();

}

Output:

Example of void datatype

0767

2.Null

Just like normal variables, pointers are not initialized when they are instantiated. Unless a value is assigned, a pointer will point to some garbage address by default.

Besides memory addresses, there is one additional value that a pointer can hold: a null value. A null value is a special value that means the pointer is not pointing at anything. A pointer holding a null value is called a null pointer.

Fig: NULL Pointer

Example:

int *p=null;

Program:

#inlcude<iostream.h>

#include<conio.h>

void main()

{

int a;

int *p=null;

cout<<”input one number”;

cin>>a;

p=&a;

cout<<*p;

getch();

}

Output:

Input one no 23

23