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

Recursive function, Binomial coefficients are the numeric factors of the pr...

Binomial coefficients are the numeric factors of the products in a power of a binomial such as (x + y)n. For example, (x + y)2 = x2 + 2 x y + y2 has the coefficients 1 2 1. Binomia

What is a newline escape sequence, What is a newline escape sequence? -...

What is a newline escape sequence? - A newline escape sequence is signified by the \n character. - It is used to insert a new line whereas displaying the output data. - T

Define four facilities provided by c language preprocessor, Define Four Fac...

Define Four Facilities Provided by C Language Preprocessor? The C language preprocessor provides four separate facilities that you can use as you see fit:   Inclusion

Functions, Define  F u n c t i o n?  T h e r e a r e t...

Define  F u n c t i o n?  T h e r e a r e t w o t y p e s o f f u n ct i o n b u i l t - i n f un ct i o n s a n d u

How do you know that your class requires virtual destructor, How do you kn...

How do you know that your class requires a virtual destructor? A: If at least your class has one virtual function, you must make a destructor for this class virtual. It will let

Sort wars, Explain each of the algorithms in a way that would be understand...

Explain each of the algorithms in a way that would be understandable to an intelligent person who is not familiar with programming. You should not use any code (or even pseudo code

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

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

Password Validation Prgram in C++, Create a .cpp program that verifies the ...

Create a .cpp program that verifies the strength of a password that a user is entering is strong (complex/secure) enough. In the main area of the program, prompt the user to enter

C program to print character array, Program to print character array : ...

Program to print character array : Write a program to print the character array by using string class functions. void main() {  char line[30];   int i=0;   clrsc

C, how to learn programming skills

how to learn programming skills

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