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

#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

Class and object, how to write c++ code for financial system using class an...

how to write c++ code for financial system using class and object

C program for even & odd no in any matrices , C Program for EVEN & ODD NO I...

C Program for EVEN & ODD NO IN ANY MATRICES #include stdio.h> #include conio.h> void main() {           int a[100][100];           int i=0,j=0,r,c,even=0,odd=0;

C program for total & average in the array , C Program for TOTAL  & AVERA...

C Program for TOTAL  & AVERAGE IN THE ARRAY  #include stdio.h> #include conio.h> #include string.h> void main() {           int i=0,n[100],limit=0,a=0;

Explain control flow, Control Flow The control flow statements are used...

Control Flow The control flow statements are used when it is needed that the flow of the program is to be changed after taking some decision. This control flow statement theref

Change to palindrome, convert string s into palindrome by doing character r...

convert string s into palindrome by doing character replacement

Tranporsition cipher, write a C program that can display the transpose form...

write a C program that can display the transpose form of a ciphertext matrix.

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

Programming Assignment 4, For this program, you are going to modify your pr...

For this program, you are going to modify your previous program (program 3) so that it will now have a menu to see if the user wants to read the input from a file or interactively.

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