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

Prime no., program to find if a no . is prime or not

program to find if a no . is prime or not

Sums a sequence of integers, assume that the first integer read with cin sp...

assume that the first integer read with cin specifies the number of values remaining to be entered. that program should read only one value each time cin is executed .a typical inp

Stream input and output functions, Within C we access external devices by ...

Within C we access external devices by means of a pointer i.e. address. The address could point to any memory mapped device i.e. Ram, Rom, Duart, Disk drives etc. Therefore there i

''c'' programme, Write a ''C'' program to accept any 3 digit integer number...

Write a ''C'' program to accept any 3 digit integer number from the keyboard and display the word equivalent representation of the given number.

Recursion, #questiowrite a program to calculate e^x

#questiowrite a program to calculate e^x

Decode the code, Smugglers are becoming very smart day by day. Now they hav...

Smugglers are becoming very smart day by day. Now they have developed a new technique of sending their messages from one smuggler to another. In their new technology, they are send

Write a code to implement the base and derived class, Study the given hiera...

Study the given hierarchical class diagram and additional information, and answer the questions that follow: Sale Company: string unitPrice: double

Does improper inheritance have potential to wreck a project, Does improper ...

Does improper inheritance have a potential to wreck a project? Many projects meet a dead end due to bad inheritance. Hence it certainly has potential to wreck a project. Sma

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