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

Explain the process of using the constructor, Using the Constructor The...

Using the Constructor There are basically three ways of creating and initializing the object. The first way to call the constructor is explicitly as :

#titlbinary searching.., Ask question #Minimum 100 words awhat is the pre c...

Ask question #Minimum 100 words awhat is the pre condition for binary searching ccepted#

#title.digital clock, Write a program to print a digital clock which displa...

Write a program to print a digital clock which displays the time for 2 hours .

Differentiate between the expression ++a and a++, Differentiate between the...

Differentiate between the expression "++a" and "a++"? - With ++a, increment happens first on variable a, and resulting value is used. This is known as prefix increment. - Wi

Define the data types of c language, Define the Data Types of c language? ...

Define the Data Types of c language? The C has a concept of 'data types' which are used to define a variable before its use and the definition of a variable will assign storage

What does it mean to declare a destructor as static, d) a "static destructo...

d) a "static destructor" is a static member function of the class which accepts one argument - a pointer to the object of that class to be cracked. It is probably utilized along wi

Console atm machine coding, construct a console programme for a bank ATM m...

construct a console programme for a bank ATM machine.

Implement binary heap in c++?, A:BinaryHeap.h ------------ #ifndef BI...

A:BinaryHeap.h ------------ #ifndef BINARY_HEAP_H_ #define BINARY_HEAP_H_ #include "dsexceptions.h" #include "vector.h" // BinaryHeap class // CONSTRUCTION: wi

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