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 briefly about class and objects, Question 1. Explain Briefly ab...

Question 1. Explain Briefly about class and objects. 2. Create a class string which stores a string value. Overload ++ operator which converts the characters of the string t

Describe problem with runtime type identification?, Describe problem with R...

Describe problem with Runtime type identification? A: The run time kind identification comes at cost of performance penalty. Compiler maintains class.

Program to create a query from database, Implement (a part of) electronic e...

Implement (a part of) electronic election Scenario where following political parties are participating in election: PPP, PML and PTI.  Create a class PollingStation where it stor

C++ coursework programming for engineering, Hi there I am looking for hel...

Hi there I am looking for help with c++ coursework. Could you please provide me with email address to email a copy of it. Thanks

C program for add, C Program for ADD,SUB,MUL,DIV,REM void main() { ...

C Program for ADD,SUB,MUL,DIV,REM void main() {   int a,b,c,ch=0;           clrscr();           while(ch           { printf(" \n\n 1:- For To Add\n 2:- For

Explain the bit wise operations, Explain the Bit Wise Operations? C lan...

Explain the Bit Wise Operations? C language in particular was created to make it easier to write operating systems. The objective was to have a language that provided excellent

Example for external storage class - computer programming, Example for exte...

Example for external storage class - computer programming? extern double sin (double); In a function prototype, for the sin() function its function definition ~ we can write

Super ansii prgm, Ask quIn the Byteland country a string "s" is said to sup...

Ask quIn the Byteland country a string "s" is said to super ascii string if and only if count of each charecter in the string is equal to its ascci value in the byteland country as

Decision control instruction, if age of ram,shayam and ajay are input throu...

if age of ram,shayam and ajay are input through keyboard,write a program to determine the youngest of the three.

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