Objected-oriented Programming 2 Introduction

Using constant with Pointers

• const qualifier
• Indicates that value of variable should not be modified
• const used when function does not need to change the variable’s value
• Example
• A function that prints the elements of an array, takes array and int indicating length
• Array contents are not changed – should be const
• Array length is not changed – should be const
• Four ways to pass pointer to function
• Non-constant pointer to non-constant data
• Non-constant pointer to constant data//we cannot set
• Constant pointer to non-constant data
• Constant pointer to constant data//A const pointer to a const value can not be set to point to another address, nor can the value it is pointing to be changed through the pointer.