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 different implementations of oop, Different implementations of OOP ...

Different implementations of OOP Object-oriented programming is not mainly concerned with the details of the program operation. Instead, it deals with the overall design of the

COMPILER DESIGN, aj is a newbie to the programming and while learning the p...

aj is a newbie to the programming and while learning the programming language he came to know the following rules: - Each program must start with ''{'' and end with ''}''.

Can copy constructor admit an object of the same class , Can copy construct...

Can copy constructor admit an object of the same class as parameter, rather than reference of the object?

C program to demonstrate pointer to variable, C program to demonstrate Poin...

C program to demonstrate Pointer to variable: void p2a(int *); void main() {                 int x=10, *a,**b;                 int arr[5];                 //poin

Displays the lower case and upper case alphabetical letters, Write a progra...

Write a program that displays both the lower case and upper case alphabetical letters using the following Format Lowercase        Uppercase a                        A

Function, write a function named "fact"that takes one integer arguments,ca...

write a function named "fact"that takes one integer arguments,call them "num" and returns as ..............

Assigment, Hi is there any chance to get assignment for fresher tutor

Hi is there any chance to get assignment for fresher tutor

What is token in programming languages, T o k e n :  Tokens  are  s...

T o k e n :  Tokens  are  small  entities  in  a  program.    Example: identifiers,  keywords,  constants, operators, strings, etc.  These tokens are used almost in same wa

How do i develop a subscript operator for a matrix class?, Employ operator ...

Employ operator () instead of operator[]. While you have multiple subscripts, the cleanest way to do it is along with operator () instead of with operator[]. The reason is that

Explain object conversions, Object Conversions Just like initialization...

Object Conversions Just like initialization, conversions are also done automatically when an object of a derived class is assigned to an object of the base class. Though, the c

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