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

Distinguish between a class and an object, Problem: (a) Distinguish bet...

Problem: (a) Distinguish between a class and an object. (b) Define instantiation. (c) What is the importance of the "this" variable in java. (d) What is encapsulation?

When should i use references, A: Use references when you can use, and use p...

A: Use references when you can use, and use pointers when you have to. References are generally preferred over pointers whenever you don't require "reseating". Usually this mean

Palindrome, A palindrome is a string that reads the same from both the ends...

A palindrome is a string that reads the same from both the ends. Given a string S convert it to a palindrome by doing character replacement. Your task is to convert S to palindrome

Explain pros and cons of cpp as a programming language, Write a 3-4 page pa...

Write a 3-4 page paper (350 words per page) in APA format detailing the development and use of C++ in academia and in industry. Explain the pros and cons of C++ as a programming la

Explain floating literal, Floating  literal They can be written in comm...

Floating  literal They can be written in common decimal as well as scientific notation (floating point representation). By default it is of type double. F, L is applied only to

Explain logical operators, Logical Operators We say any expression that...

Logical Operators We say any expression that evaluates to zero is a FALSE logic condition and that evaluating to non-zero value is a TRUE condition. Logical operators are usefu

Question, wap to calculatethe volume of cone,cylinderand sphere

wap to calculatethe volume of cone,cylinderand sphere

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

C program for swapping the string, C Program for SWAPPING THE STRING #i...

C Program for SWAPPING THE STRING #include conio.h> #include stdio.h> void main() {           char a[50],temp=0;           int i=0,c=0,c1=0,l=0;           clr

What is structure, What is Structure? An Array is a data structure who...

What is Structure? An Array is a data structure whose elements are all of the similar data type. The structure is a data structure whose individual elements are able to differ

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