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

Reading from a Hash table in C, I''m having trouble with my C code to red f...

I''m having trouble with my C code to red from a Hash table. Not sure what it is I''m doing wrong and stumped. I need to get it figured out by tomorrow at 4:00 p.m. Eastern time. C

How virtual functions can be implemented in c++?, Normal 0 fals...

Normal 0 false false false EN-US X-NONE X-NONE

C program to convert time in 24 hour format to 12., Aim: To implement a pr...

Aim: To implement a program to convert time in 24 hour format to 12 hour format. Code:                       #include #include #include class time24 {

Algorithm, What is an algorithm and write an algorithm to calculate the sim...

What is an algorithm and write an algorithm to calculate the simple interest

Procedure to add two numbers in a recursive manner, (a) Write a procedure c...

(a) Write a procedure called (add x y) that adds two numbers in a recursive manner. Specifically, note that x + y = (x + 1) + (y - 1) and x + 0 = x. (b) Using the substitution m

How to write a global inline function, How to write a global inline functio...

How to write a global inline function First, let's get away from member functions for a moment and consider a global function.  To make a request that this function be in line:

Source code, I hv an assignment to do, I almost done. But i cant find whats...

I hv an assignment to do, I almost done. But i cant find whats wrong- my code is to make a simple calculator using function''s all 4 patterns. I did like this- #include int add

C/c++, Byteland county is very famous for luminous jewels. Luminous jewels ...

Byteland county is very famous for luminous jewels. Luminous jewels are used in making beautiful necklaces. A necklace consists of various luminous jewels of particular colour. Nec

Area under curve, Write a program to find the area under the curve y = f(x)...

Write a program to find the area under the curve y = f(x) between x = a and x = b, integrate y = f(x) between the limits of a and b. The area under a curve between two points can b

Compiler design-limit the methods, Ask question #Minimum 100Problem : Compi...

Ask question #Minimum 100Problem : Compiler Design - Limit the methods Rahul is a newbie to the programming and while learning the programming language he came to know the followi

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