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

Write a program that illustrate command line parameters, Write a Program th...

Write a Program that illustrate Command Line Parameters? main(int argc, char *argv[]) { int i; for(i = 0; i printf("arg %d: %s\n", i, argv[i]); return 0; }

Loan negotiation is usually not a straightforward ta, Ask question #Minimum...

Ask question #Minimum 1Loan negotiation is usually not a straightforward task. A type of loan is the discount installment loan. This type of loan has the following characteristics.

C program to display a rectangle, Aim: To implement a program to display a...

Aim: To implement a program to display a rectangle, circle and triangle. Code:                       class shape {             public:                         vir

Game coding, polishing the jewel game with c coding

polishing the jewel game with c coding

Programing project, Hello, Do you have any idea for programming project to...

Hello, Do you have any idea for programming project to simulate a network attack (threat) mechanism or a defense mechanism. Can I get some suggestions for this. Please include th

Program is to reverse the names stored in an array pointer, Program is to r...

Program is to reverse the names stored in an array pointer: Program is to reverse the 6 names stored in an array pointer as name[] void main()   {  clrscr();  char

How can dereferencing the pointer this, Dereferencing the Pointer this ...

Dereferencing the Pointer this Sometimes a member function requires to make a copy of the invoking instance so that it can change the copy without affecting the original instan

Char, how many bytes required to char

how many bytes required to char

C language, in a program for what purpose print f and scan f is used

in a program for what purpose print f and scan f is used

Luminous Jewels - The Polishing Game, Byteland county is very famous for lu...

Byteland county is very famous for luminous jewels. Luminous jewels are used in making beautiful necklaces. A necklace consists of various luminous jewels of particular colour. Nec

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