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

C program for pattern star, 1 PETTERN1 (Pettern1.c) main() { ...

1 PETTERN1 (Pettern1.c) main() { int i,j,k=1,a; clrscr(); for(i=1;i { if(i>=3)

Stone game, A game is played with three piles of stones and two players. At...

A game is played with three piles of stones and two players. At her turn, a player removes one or more stones from the piles. However, if she takes stones from more than one pile,

Define scope rules of c program - computer programming, Define Scope Rules ...

Define Scope Rules of C program - Computer Programming? The fundamental rule of scope is that identifiers are accessible only within the block in which they are declared and th

When i develop a destructor, When I develop a destructor, do I require to e...

When I develop a destructor, do I require to explicitly call the destructors for my member objects?

If i wish a local to "die" before the close} of the scope, What if I wish a...

What if I wish a local to "die" before the close} of the scope wherein it was created? Can I call a destructor on a local if I want to?

Graphical user interface designed for the output peripherals, Introduction ...

Introduction to I/O interfacing, discuss microcontrollers applications in industry. Detailed product design specifications that have sections on both hardware and software inclu

Boardcoloring., Smugglers are becoming very smart day by day. Now they have...

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

Using c language, I have a program and I want someone to fix it for me by u...

I have a program and I want someone to fix it for me by using basic c language program.

Explain procedural logic, Explain procedural logic A procedure, or func...

Explain procedural logic A procedure, or function, was explained as a set of specific instructions implemented in sequential manner. The data is kept separate from the procedur

C expressions - assume variables are double or float, Assume variables x, f...

Assume variables x, f, and d are of type int, float, and double, respectively. Their values are arbitrary, except that neither f nor d equals +∞, -∞, or NaN . For each of the fo

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages