POINTER TO POINTER, MULTIPLE INDIRECTION

POINTER TO POINTER     (OR)    MULTIPLE INDIRECTION

• A pointer variable that holds address of an ordinary variable is known as pointer-to-variable. 
• A pointer variable that holds address of another pointer variable is known as pointer-to-pointer.  For this, add an asterisk symbol for each level of reference.

            Example:        int x = 10;

                                    int *p;

                                    p=&a;

                                    int **q;

                                    q=&p;

/* EXAMPLE PROGRAM FOR POINTER TO POINTER VARIABLE */

main()

{

            int a=5,*p,**q;

            clrscr();

            p=&a;

            q=&p;

            printf("\nValue with p is:%d",*p);

            printf("\nValue with q is:%d",**q);

}