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

STRING, getting a palindrome using minimum replacement

getting a palindrome using minimum replacement

Explain register variable, Explain Register Variable Computers have int...

Explain Register Variable Computers have internal registers, which are used to keep data temporarily, before any operation can be performed. Intermediate results of the calcula

Looping, Write a programme to display the patern.. A A B A C B A B C...

Write a programme to display the patern.. A A B A C B A B C A B A A

How can one encourage his (older) compiler , Q: How can one encourage his (...

Q: How can one encourage his (older) compiler to check new to see automatically if it returns NULL?       A: His compiler eventually will. If he contain an old compiler wh

#title. c program on pebble merchant, #questThere is a pebble merchant. He ...

#questThere is a pebble merchant. He sells the pebbles, that are used for shining the floor. His main duty is to take the length of the room’s sides. But he sometimes mistakes doin

Area under the curve, Write a program to find the area under the curve y = ...

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

State six typical application of primary cells, Normal 0 false ...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Matematic, how to make program c++

how to make program c++

Random question, Ask question #write statement that assign random integer t...

Ask question #write statement that assign random integer to the varaible n in the (100

Selection sort - c program, Selection sort - C program: Write a progra...

Selection sort - C program: Write a program to define a selection sort. void main()  {   clrscr();   int a[100],ch,n;   cout   cin>>n;   for (int i=0;i

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