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 enumerated constants, Enumerated Constants Enumerated constants...

Enumerated Constants Enumerated constants enable the creation of new types and then explain variables of these types so that their values are restricted to a set of possible va

C program, Just need the answers to the following 3 questions. "NO NEED to ...

Just need the answers to the following 3 questions. "NO NEED to write a program compile or run it, do not need it. Just need the answers for the following questions. Example quest

Tranporsition cipher, write a C program that can display the transpose form...

write a C program that can display the transpose form of a ciphertext matrix.

Luminous jewels, Problem : Luminous Jewels - Polishing Necklace Byteland c...

Problem : Luminous Jewels - Polishing Necklace Byteland county is very famous for luminous jewels. Luminous jewels are used in making beautiful necklaces. A necklace consists of v

What does extern "c" int func(int *, A: This will turn o_ "name mangling" f...

A: This will turn o_ "name mangling" for func so that one can connect to code compiled by a C compiler.

How private instance of a class can be assigned values, Question 1: (a)...

Question 1: (a) Explain clearly the following concepts using suitable examples of your own:- (i) concrete class v/s abstract class (ii) constructor v/s over

Explain reference oddities, Reference Oddities A reference variable can...

Reference Oddities A reference variable can demote to any integer variable, be it in an array or a member variable from structure or class. Reference variables can demote to co

Overloading binary operators, Overloading Binary Operators class SI ...

Overloading Binary Operators class SI {float i,p,n,r,a; public: SI(){}; SI(int gp,int gn, int gr); void putdata(void); SI operator+(SI); }; SI SI::opera

#pebblemerchant.h, #pebblemerchant.h

#pebblemerchant.h

Coding, Problem Statement: You have to write a C program to develop a Car P...

Problem Statement: You have to write a C program to develop a Car Parking Management System for a busy commercial area. The system will record the car plate number, date and time w

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages