c-programming.......

pointer:- A pointer is a variable that stores the address of another variable.

• features of pointer:-

1.  pointer is save memory space.
2.  The memory is accessed efficiently with the pointer is dynamically memory is allocated & De-allocated.
3. Execution time with pointer is faster because data is manipulated with the address i.e direct access to memory location.
4. Pointer are used with Data-Structures.

• *(astric) symbol is used for pointer.
• Declaration of pointer:-

A pointer provide access to a variable by using the address of that variable.

• A pointer variable is therefore a variables that stores the address of another variable.

        int *p;

• syntax:-

      Data-Type *pointer name;

• Example:-

     int pointer ptr;

     

   #include<stdio.h>

   #include<conio.h>

    void main()

    {

    int a= 100;

    int *p;

    int **p1;

    p= &a;

    p1= &p;

printf("\n value of A%d", a);             

printf("%d", *p);                         

printf("%d", **p);

    getch();

             }