What is the benefit of using #define to declare a constant?

Asked by Last Modified  

4 Answers

Learn C Language

Follow 0
Answer

Please enter your answer

Computer & Maths Professor

Consider a scenario where we are using a C program to generate marksheets of students. The maximum marks per subject are 100 and we are using 100 in let us say 5 formulas in the entire program. Now, if the maximum marks changes from 100 to 70, we need to make changes at 5 places if we use 100 directly....
read more
Consider a scenario where we are using a C program to generate marksheets of students. The maximum marks per subject are 100 and we are using 100 in let us say 5 formulas in the entire program. Now, if the maximum marks changes from 100 to 70, we need to make changes at 5 places if we use 100 directly. On the other hand, if we had used MAX constant with the help of # define, we need to change at only 1 place. read less
Comments
Dislike Bookmark

Using the #define method of declaring a constant enables you to declare a constant in one place and use it throughout your program. This helps make your programs more maintainable, because you need to maintain only the #define statement and not several instances of individual constants throughout your...
read more
Using the #define method of declaring a constant enables you to declare a constant in one place and use it throughout your program. This helps make your programs more maintainable, because you need to maintain only the #define statement and not several instances of individual constants throughout your program. For instance, if your program used the value of pi (approximately 3.14159) several times, you might want to declare a constant for pi as follows: #define PI 3.14159 This way, if you wanted to expand the precision of pi for more accuracy, you could change it in one place rather than several places. Usually, it is best to put #define statements in an include file so that several modules can use the same constant value. read less
Comments
Dislike Bookmark

Doing mathematics & computing from IIT Delhi

It becomes a global variable. You can use it main and in any function in the file.
Comments
Dislike Bookmark

Thanks for the question Govind ...... The constant which have defined using #define function can be used anywhere in the program without re declaration Thanks, Team DishaaPro www.dishaapro.com
Comments
Dislike Bookmark

View 2 more Answers

Related Questions

What is #line used for?
# is a preprocessor directive. so it is used in the c program by two way. 1. such as #include stdio.h In this line to read all the library function of stdio.h before processing the program. 2. # define...
Pradeep
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
what is syntex error
A syntax error is an error which found in the source code of a program or sometimes it can be small grammatical mistakes in spelling or limited to a single character. Programming languages follow their...
Tanha
What is the best website to learn c language?
NIIT online
Nom
What is the use of semicolon at the end of every statement?
Computer languages are just like our normal communication languages. Hindi, eng etc. Enable to communicate us with each other. Similarly computer language helps us to communicate with computer. As a full...
Krishna

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

Ask a Question

Related Lessons

Internet of Things, Social Media Becoming Part of E-Discovery Landscape
The days when e-discovery consisted of handing over copies of e-mails to address Freedom of Information Act (FOIA) requests, compliance regulations or other legal obligations are over. Now, it's just as...

Rajesh N v

3 0
1
Some interview questions for freshers on C language
Q1. What are the two forms of #include? There are two variants of #include. The one is #include and the other one is #include”file”. In general the first form that is #include is used to...

Shiladitya Munshi

0 0
0
C++ Program-Working with constant using #define preprocessor
//Header Files #include#include // using #define preprocessor for defining a constant#define len 10#define br 5#define rad 3#define NEWLINE '\n' //Main function void main(){ int area_r; float area_c; //Function...

Salim ahmed Ansari

0 0
0
Some Tricky Questions in C
Can you write two functions in which one executes before main function and other executes after the main function? #pragma startup #pragma exit Where, priority is optional integer value.For user priority...

Sahana D.

1 0
0
Structures in C
A structure is a collection of one or more data members possibly of different data types, grouped together under a single name for convenient handling. Defining a Structure: In general terms,...

Venkateswararao S.

0 0
0

Recommended Articles

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 >

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 >

Learn Microsoft Excel

Microsoft Excel is an electronic spreadsheet tool which is commonly used for financial and statistical data processing. It has been developed by Microsoft and forms a major component of the widely used Microsoft Office. From individual users to the top IT companies, Excel is used worldwide. Excel is one of the most important...

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