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

Define array of structures, Define Array of Structures? An Array of Str...

Define Array of Structures? An Array of Structures is an assortment of the same data types which are declared as structures. It is useful to store large and different number of

Program for memory optimization of c / opencl code, Program for Memory Opti...

Program for Memory Optimization of C / OpenCL Code Project Description: This is possibly a very simple project for someone with an excellent knowledge of C and OpenCL. That,

Bitcoin alternative – deployment and modification, I started preparing an a...

I started preparing an alternative cryptocurrency and I am way over my head. I would like help in making modifications to the open source files and then help with deployment. I wil

Rules of inheritance, Rules of Inheritance: Private members are not...

Rules of Inheritance: Private members are not inherited; the members can be accessed only within its class. It cannot be used through the object. Protected members are

Static data members and static member function, Static Data Members: A ...

Static Data Members: A data member inside the class can construct as static data member.   There are few guidelines to be followed when declaring static data member.

Define the data type modifiers in c language, Define the Data Type Modifier...

Define the Data Type Modifiers in C language? There are three data types(int, float & double) above have the following modifiers. 1. short 2. long 3. signed 4. unsigned

Described multiple inheritance(virtual inheritance)?, Described multiple in...

Described multiple inheritance(virtual inheritance)? And explain its advantages and disadvantages? A: It is the procedure in which a child can be derived from more than one pare

What do you signify by stack unwinding?, A: this is a procedure during exce...

A: this is a procedure during exception handling while the destructor is called for all local objects in the stack among the place where the exception was thrown & where this is ca

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