POINTERS IN C

Pointers in C language is a variable that stores/points the address of another variable. A Pointer in C is used to allocate memory dynamically i.e. at run time.

On incrementing a pointer, it points to the immediately next location of its type. The way a pointer can be incremented it can be decremented as well, to point to earlier locations. 

Pointer Syntax: data_type *var_name; 
Example: int *p;  char *p; where * is used to denote that “p” is pointer variable and not a normal variable.

(&) OPERATOR 

We can display the address of a variable using the ampersand sign. & operator is used to access the address of variable num. The & operator is also known as “Address of” Operator. Pointer is just like another variable, the main difference is that it stores address of another variable rather than a value.

(*) OPERATOR

"Dereference Operator" or "Indirection Operator denoted by an asterisk character (*) is a unary operator which performs two operations with the pointer (which is used for two purposes with the pointers).

1. To declare a pointer. 
2. To access the stored value of the memory (location) pointed by the pointer.

EXAMPLE:-

#include<stdio.h>

int main()

{

int *p;

int var =10;

p=&var;

print("Value of variable var is: %d",  var);

print("\nValue of variable var is: %d",  *p);

print("\nAddress of variable var is: %p",  &var);

print("\nAddress of variable var is: %p",  p);

print("\nAddress of pointer p is: %p",  &p);

return 0;

}

OUTPUT:-

Value of variable var is: 10

Value of variable var is: 10

Address of variable var is: 1001

Address of variable var is: 1001

Address of pointer p is: 1002