What are 'macros' and 'constants' used for in C?

Asked by Last Modified  

2 Answers

Learn C Language

Follow 2
Answer

Please enter your answer

Savitra

+46-768394959 (Whatsapp number) please reach me on this number

Macros: Macros are defined using the #define preprocessor directive. They are not variables; instead, they are symbolic constants. Macros are replaced by their values at compile-time through a process called macro expansion. Macros can include code and perform text substitution. They are processed...
read more
Macros: Macros are defined using the #define preprocessor directive. They are not variables; instead, they are symbolic constants. Macros are replaced by their values at compile-time through a process called macro expansion. Macros can include code and perform text substitution. They are processed by the preprocessor before the actual compilation of the code. Macros can be used to create reusable code snippets, conditional compilation, or to define constants with complex expressions. Constants: Constants are variables that are declared as read-only, and their values cannot be changed during the program's execution. In C, you can define constants using the const keyword. These are typically used for values that should not change throughout the program. Constants are stored in memory, and their values are accessed like regular variables. read less
Comments
Dislike Bookmark

Experienced Computer trainer having worked in IT sector for 20 years.

The const keyword causes the identifier size to be allocated in the read-only memory. This means that the value of the identifier can not be changed by the executing program. MACROS are efficient than the const statements as they are not given any memory, being more Readable and Faster in execution!
Comments
Dislike Bookmark

Related Questions

How can a program be made to print the line number where an error occurs?
The ANSI C standard includes a predefined macro named __LINE__ that can be used to insert the current source code line number in your program. This can be a very valuable macro when it comes to debugging your program and checking for logic errors.
Rituparna
0 0
7
Which is the best software for working with C language?
Choosing the "best" software for working with the C language can depend on your specific needs and preferences, but a widely used and reliable option is the GNU Compiler Collection (GCC). GCC is an open-source...
Kiran
0 0
6
What is the fee for learning C Language?
In C lang course ,there is not only basics it also having whole package to complete the task and course.cost may be it's depends upon the institute n teaching level
Sk.
How to improve my c knowledge........
practice it as much as possible. for beginning, use let us c by yashwant kanetkar
Anish
If I want to learn Java, is it necessary to know about C language?
It is not necessary to know about C language if you want to learn Java. But some syntax are same.
Nitesh
0 0
7

Now ask question in any of the 1000+ Categories, and get Answers from Tutors and Trainers on UrbanPro.com

Ask a Question

Related Lessons

Operators in C
Operators in C Operator: An operator is a symbol that tells the compiler to perform certain mathematical or logical calculations. Operators are used in programs to manipulate data and variables. The...

Venkateswararao S.

0 0
0
What is Safety-Critical Software?
A software whose failure may cause death or injuries to the users called Safety-Critical Software.The software present as part of Aeroplanes, or present in Rail as railway signalling software or Automotive...

Vihanga Embedsoft

0 0
0
Set 0 To Kth Bit In A Variable
The following code snippet Set 0 to Kth Bit in an variable #include int UnsetBitValue(int n, int k);int main(){ printf("%d\n\n",UnsetBitValue(255,6)); return 0;}// Set kth bit to zeroint UnsetBitValue(int...

Umasankar Natarajan

0 0
0
Advantages of C++ Language
Advantages of C++ - C++ is a profoundly convenient dialect and is frequently the dialect of decision for multi-gadget, multi-stage application advancement. - C++ is a protest situated programming dialect...

Bright Computer Education

2 0
0
C, Cpp, Java, Python, Javascript Programming Languages
Learning C is as good as Learning a Natural Language(such as English, Hindi, Telugu, Tamil etc) We use Natural Languages to communicate with humans whereas we use Programming Languages such as C, Cpp,...
V

Vamshi

0 0
0

Recommended Articles

Brilliant Academy, a reputed B. Tech Tuition...

Brilliant Academy is one of the reputed institutes for B.Tech tuition classes. This institute is specialised in delivering quality tuition classes for B.E, Engineering - all streams and Engineering diploma courses. Incorporated in 2012, Brillant Academy is a brainchild of Mr Jagadeesh. The main motto of the academy is to...

Read full article >

Lasya Infotech: An educational Training...

Lasya Infotech is a Hyderabad based IT training institute founded in 2016 by O Venkat. Believing in his innovation, passion and persistence and with a diverse blend of experience, he started his brainchild to deliver exemplary professional courses to aspiring candidates by honing their skills. Ever since the institute envisions...

Read full article >

Why Should you Become an IT Consultant

Information technology consultancy or Information technology consulting is a specialized field in which one can set their focus on providing advisory services to business firms on finding ways to use innovations in information technology to further their business and meet the objectives of the business. Not only does...

Read full article >

Make a Career as a BPO Professional

Business Process outsourcing (BPO) services can be considered as a kind of outsourcing which involves subletting of specific functions associated with any business to a third party service provider. BPO is usually administered as a cost-saving procedure for functions which an organization needs but does not rely upon to...

Read full article >

Find C Language Classes near you
C Language Classes in Bangalore
C Language Classes in Hyderabad
C Language Classes in Delhi
C Language Classes in Pune
C Language Classes in Chennai
C Language Classes in Mumbai
C Language Classes in Kolkata
C Language Classes in Noida
C Language Classes in Gurgaon
C Language Classes in Ghaziabad

Looking for C Language Classes?

Learn from the Best Tutors on UrbanPro

Are you a Tutor or Training Institute?

Join UrbanPro Today to find students near you