Chapter 9, Problem 61RQE

Program Plan Intro

Pointer:

Pointer will allow the user to indirectly access and manipulate the variable data contents. A pointer variable will hold the address of the data contents. If an asterisk “*” operator is present before the variable then that variable is referred as pointer variable.

Consider the following statement:

//definition of pointer variable

int *ptrvar;

Here the variable “ptrvar” is defined to a pointer variable of integer data type. So, it can store the address of an integer variable.

Pointer to constant:

When an address of a constant item is passed to a pointer such that no modification can be made to that variables pointer to constants can be used.

Example:

//definition of pointer to constant variable

const int *ptr;

Explanation:

In the above definition, the variable “ptr” is declared as constant and any change made will not be accepted by the compiler.