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

Discount program, Build a program that calculates a discount for items base...

Build a program that calculates a discount for items based on quantity bought each item is $99.99 Ask user to enter the quantity of the items Get the quantity of items from the u

#Program, Write a program that accepts two real numbers from a user and a s...

Write a program that accepts two real numbers from a user and a select code. If the entered select code is 1, have the program add the two previously entered numbers and display t

Stack, write c language program that shows stack overflow..

write c language program that shows stack overflow..

Flowchart, create a flowchart that display the assume that there are 3 sect...

create a flowchart that display the assume that there are 3 section each student ?

C and Data structure, Implement multiple stacks in a single dimensional arr...

Implement multiple stacks in a single dimensional array using c.

What is object variable, The definition of an object(variable ): We can...

The definition of an object(variable ): We can explain a variable(set memory to the variable) in the following ways. e.g. double salary; int month; When more than o

Data Handling in computers, though the ascii is called 7-bit code. why do w...

though the ascii is called 7-bit code. why do we use 8-bits to represent a character?

Verification class, I need help to understand and do this assignment ******...

I need help to understand and do this assignment ********************************************************* You are to insert the missing code in the C program given for combinatio

C program to display the contents of file on a screen, Program is to displa...

Program is to display the contents of file on a screen: Write a program to display the contents of file on a screen void main()   {  clrscr();  ifstream fin("ascii

Spaning tree , what is the function of spanning tree in graph algorithm?

what is the function of spanning tree in graph algorithm?

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