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

Padovan string., #question.A Padovan string P(n) for a natural number n is ...

#question.A Padovan string P(n) for a natural number n is defined as: P(0) = ‘X’ P(1) = ‘Y’ P(2) = ‘Z’ P(n) = P(n-2) + P(n-3), n>2 where + denotes string concatenation. For a s

What are header files and what are their uses, What are header files? What ...

What are header files? What are their uses? - Header files are also known as library files. - They carry two significant things: definitions and prototypes of functions bein

Describe the behaviour of procedure, Observe that our model of evaluation a...

Observe that our model of evaluation allows for combinations whose operators are compound expressions. (a) Use this observation to describe the behavior of the following procedu

Hungarian notation, describe how identifiers of different data type are def...

describe how identifiers of different data type are defined using this notaion?

Minimum shelf, At a shop of marbles, packs of marbles are prepared. Packets...

At a shop of marbles, packs of marbles are prepared. Packets are named A, B, C, D, E …….. All packets are kept in a VERTICAL SHELF in random order. Any numbers of packets with thes

Advantages to the use of functions, Question: (a) What is a function? A...

Question: (a) What is a function? Are functions needed when writing a C program? (b) State one of the advantages to the use of functions. (c) What do you meant by underst

Call by reference, Call by reference: Arguments to a function can be pa...

Call by reference: Arguments to a function can be passed in two way; one by call by value and other by call by reference. Call by value is passed either through a constant

Binary search tree and graph, Important Note: No course works, which have b...

Important Note: No course works, which have been submitted via hard copies or emails, will be accepted a short essay below edited in a document (word, other) files with

Define bitwise-shift operators, Define Bitwise-Shift Operators? The shi...

Define Bitwise-Shift Operators? The shift operators perform suitable shift by operator on the right to the operator on the left. The right operator should be positive. The va

Char, how many bytes required to char

how many bytes required to char

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages