UrbanPro
Login Ask & Answer Success Stories Paid Courses Free Classes Tuition & Classes Fees Write a Review All Categories Help Center
Post your Learning Need Signup as a Tutor
✕

Popular Cities

Bangalore

Hyderabad

Delhi

Mumbai

Chennai

Pune

Kolkata

Gurgaon

Ahmedabad

Jaipur

Noida

✕

Learn C Language from the Best Tutors

  • Affordable fees
  • 1-1 or Group class
  • Flexible Timings
  • Verified Tutors

Book a Free Demo

C Language > Learn C Language > How can you check to see whether a symbol is defined?
✕

Search in

How can you check to see whether a symbol is defined?

Asked by Last Modified  

20 Answers

Learn C Language

Follow 1
Answer

Please enter your answer

Professional Tutor with 15 years of experience.

You can use the #ifdef and #ifndef preprocessor directives to check whether a symbol has been defined (#ifdef) or whether it has not been defined (#ifndef).
Comments
Dislike Bookmark

Thank You for the question .... To check the symbol has been defined use the #ifdef function. Thank You, Team DishaaPro www.dishaapro.com
Comments
Dislike Bookmark

Having 17 years of teaching experience

To check whether the symbol is defined or not you have to use #ifdef or #ifndef. You can check like a simple if condition: #ifdef NAME (the course of ation i.e. your c / c++ code) #else (the course of ation i.e. your c / c++ code) #endif
Comments
Dislike Bookmark

You can use the #ifdef and #ifndef preprocessor directives to check whether a symbol has been defined (#ifdef) or whether it has not been defined (#ifndef).
Comments
Dislike Bookmark

Software Professional Trainer with 26+ years of Experience in Software Design and Development

#ifdef and #ifndef preprocessor directives to check whether a symbol has been defined (#ifdef) or (#ifndef). #ifndef OS #define OS unix #endif ========= #ifdef UNIX #define OS unix #else #define OS windows #endif
Comments
Dislike Bookmark

Tutor

you can use #if def and #ifndef
Comments
Dislike Bookmark

Trainer

You can use the #ifdef and #ifndef preprocessor directives to check whether a symbol has been defined (#ifdef) or whether it has not been defined (#ifndef).
Comments
Dislike Bookmark

You can use the #ifdef and #ifndef preprocessor directives to check whether a symbol has been defined.
Comments
Dislike Bookmark

defined where in what scope? And where do you want to check in the source code or object file or library or executable?
Comments
Dislike Bookmark

Mathematics and Computer science guide

You can use the #ifdef and #ifndef preprocessor directives to check whether a symbol has been defined (#ifdef) or whether it has not been defined (#ifndef). Many programmers like to ensure that their own version of NULL is defined, not someone else's. This task can be accomplished as shown here: #ifdef...
read more
You can use the #ifdef and #ifndef preprocessor directives to check whether a symbol has been defined (#ifdef) or whether it has not been defined (#ifndef). Many programmers like to ensure that their own version of NULL is defined, not someone else's. This task can be accomplished as shown here: #ifdef NULL #undef NULL #endif #define NULL (void*) 0 The first line, #ifdef NULL, checks to see whether the NULL symbol has been defined. If so, it is undefined using #undef NULL and the new definition of NULL is defined. To check whether a symbol has not been defined yet, you would use the #ifndef preprocessor directive. read less
Comments
Dislike Bookmark

View 18 more Answers

Related Questions

What is a void main() in the C programming language?
In C programming, void main() is an incorrect signature for the main function. The correct signature is int main(). The main function serves as the entry point for C programs and typically returns an integer...
Ambar
0 0
5
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
Which websites are best to learn C programming?
Geek for Geeks and programiz etc
Ritu
0 0
5
Why is C still so popular?
C is often taught as an introductory programming language in computer science courses due to its simplicity and close-to-the-hardware nature. This ensures a continuous influx of developers familiar with...
Chitra
0 0
5
Basics of 'C'language
C is middle level language, using C you can write program which directly interact with the hardware like device driver programming or you can write GUI application. C is very powerful language compare...
Raghavendra

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

Ask a Question

Related Lessons

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
Compiler vs Interpreter
Compiler Interpreter Convert all the code into binary format and execute. Convert one statement at a time and execute, then Convert next statement and execute. After conversion, source...

Umasankar Natarajan

0 0
0
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
Pointers Concept
Every variable has a memory location and every memory location has its address defined which can be accessed using ampersand (&) operator, which denotes an address in memory. Consider the following...

Sudarshan Gupta

0 0
0
Java and C trainer
Always think any conspect with real-time example like Object -- object must have states and behaviour then only we will call that thing is Object like fan is Object (rotating,color)

Jadav Avinash

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 >

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 >

What is Applications Engineering all about?

Applications engineering is a hot trend in the current IT market.  An applications engineer is responsible for designing and application of technology products relating to various aspects of computing. To accomplish this, he/she has to work collaboratively with the company’s manufacturing, marketing, sales, and customer...

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 Gurgaon
C Language Classes in Noida
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
X

Looking for C Language Classes?

The best tutors for C Language Classes are on UrbanPro

  • Select the best Tutor
  • Book & Attend a Free Demo
  • Pay and start Learning

Learn C Language with the Best Tutors

The best Tutors for C Language Classes are on UrbanPro

This website uses cookies

We use cookies to improve user experience. Choose what cookies you allow us to use. You can read more about our Cookie Policy in our Privacy Policy

Accept All
Decline All

UrbanPro.com is India's largest network of most trusted tutors and institutes. Over 55 lakh students rely on UrbanPro.com, to fulfill their learning requirements across 1,000+ categories. Using UrbanPro.com, parents, and students can compare multiple Tutors and Institutes and choose the one that best suits their requirements. More than 7.5 lakh verified Tutors and Institutes are helping millions of students every day and growing their tutoring business on UrbanPro.com. Whether you are looking for a tutor to learn mathematics, a German language trainer to brush up your German language skills or an institute to upgrade your IT skills, we have got the best selection of Tutors and Training Institutes for you. Read more

ThinkVidya Learning Pvt Ltd © 2010-2025 All Rights Reserved