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

"Designing VB Applications Across Multiple Platform, How much to buy assig...

How much to buy assignment?

Area under curve, Write a program to find the area under the curve y = f(x)...

Write a program to find the area under the curve y = f(x) between x = a and x = b, integrate y = f(x) between the limits of a and b. The area under a curve between two points can b

Roshdy, While spending the summer as a surveyor’s assistant, you decide to ...

While spending the summer as a surveyor’s assistant, you decide to write a program that transforms compass headings in degrees (0-360) to compass bearings. A compass bearing consis

Define functions with arguments and return values, Define Functions with ar...

Define Functions with arguments and return values? The earlier category functions receive values from the calling function through arguments but do not send back any value rath

Circle queue, countSpaceAvailbility function that counts and returns the sp...

countSpaceAvailbility function that counts and returns the space availability in the circle queue there are two elemnts at the circle queue and should return 5 space if size 7 .

Program of binary tree, Program of Binary tree: Btree::Btree(int O) : ...

Program of Binary tree: Btree::Btree(int O) : itemsInContainer(0) { finishInit(O); } Btree::~Btree(void) { if( root != 0 ) delete roo

C++ project, project on business management

project on business management

Priority Queue, Ask question #Minimum 100 words acceptedEducational Objecti...

Ask question #Minimum 100 words acceptedEducational Objectives: After completing this assignment, the student should be able to accomplish the following: Apply generic algorithms i

Hotel reservation, •Flow Chart and Pseudocode of Add module - Hotel booking...

•Flow Chart and Pseudocode of Add module - Hotel booking - Signup for new membership Delete module - Hotel reservation cancellation - Change of reservation

Displays the temperature conversion chart on the screen, Write a program th...

Write a program that displays the following temperature conversion chart on the screen as follows below. Hint: c = 5.0/9.0 * (f - 2) C = degrees in Celsius F = degree in F

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages