Explain the #undef directive, C/C++ Programming

Assignment Help:

The #undef Directive

This directive undefines a previously explained macro. For, example the following will give an error since PI is undefined.

                #define PI 3.14285

                void main()

                 {

                                cout<< PI;                                           // no error here

                  # undef PI;

 

cout << PI;                          // error after undef.

                 }

 


Related Discussions:- Explain the #undef directive

Integration, to find the area under the curve y = f(x) between x = a and x ...

to find the area under the curve y = f(x) between x = a and x = b

Differentiate between functions getch () and getche (), Differentiate betwe...

Differentiate between functions getch () and getche (). - Both functions accept a character input value from user. - When getch () is used, key that was pressed won't appear

Minimum shelf, At a shop of marbles, packs of marbles are prepared. Packets...

At a shop of marbles, packs of marbles are prepared. Packets are named A, B, C, D, E …….. All packets are kept in a VERTICAL SHELF in random order. Any numbers

Fill an array of randomly generated integers, The task consists of two part...

The task consists of two parts which are both preferably implemented in one source file. Towards the end of this document you will find a code skeleton that you must assume. Start

Explain the use of functions in c++ programs, Question: (a) Write shor...

Question: (a) Write short notes on arrays. Extend your answer by putting emphasis on memory allocation. (b) Write a C++ program to input an integer n followed by n real-

Sorted linked list , Node *orderedInsert(Node *p, int newval); /* Allocates...

Node *orderedInsert(Node *p, int newval); /* Allocates a new Node with data value newval and inserts into the ordered list with first node pointer p in such a way that the data va

What does it mean to declare a member function as a virtual, What does it m...

What does it mean to declare a 1.      member function as a virtual A: (a) C++ virtual function is member function of any class, whose functionality may be over- ridden in

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd