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

Area, find area uder the curve y=f(x) between x=a and x=b   #incl...

find area uder the curve y=f(x) between x=a and x=b   #include float start_point, /* GLOBAL VARIABLES */ end_point, total_area; in

For loop, minimum of seven number

minimum of seven number

Write a program that takes the image, Write a program that takes the image ...

Write a program that takes the image tracks.jpg and finds Canny edges, and then finds lines in these edges using the Hough transform. The easiest way to do this is to take the prog

Program that print the number of hops, You are working for a computer gamin...

You are working for a computer gaming company and have been asked to look at a survival game.  You will be simulating a rabbit stranded on an island, collecting a large number of s

Program to print a series, Write a program called Series that will print/di...

Write a program called Series that will print/display a series of numbers starting with 1 and ending with the last number that is less than 30. The series should include only odd n

Member dereferencing operators, M em b e r d e r e f e r e n c ...

M em b e r d e r e f e r e n c i ng o p e r a t o r s: T h e s e op e r a t o r s w i l l b e d i s c u s s e d l a t

Lexicographic permutation, given integer ''n'' and permutation of numbers 1...

given integer ''n'' and permutation of numbers 1,2,..n-1, c program to print permutation that lexicograghically precedes given input permutation if permutation is least print input

Difference between mutex and binary semaphore, Semaphore is used to synchro...

Semaphore is used to synchronize processes. whereas mutex is used to give synchronization among threads running in the similar process.

Introduction to C language, Design and implement a library system that does...

Design and implement a library system that does the following: ? Takes details of a student/library users: first name, last name, other names, user ID number, and nationality. Th

Coding, I want MODI method''s coding in c++ using all concepts of c++..plea...

I want MODI method''s coding in c++ using all concepts of c++..please help me its my project work...

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