How can I learn which element in a union is currently active?

Asked by Last Modified  

1 Answer

Learn C Language

Follow 0
Answer

Please enter your answer

Sanath Kumar Kannam

VLSI Trainer Specialist in Front-End Design & Digital Systems

Actually, that question is really contrary to why I used unions in the first place — the idea was to be able to access one type of data AS IF it was another type. So, for instance, to dissect a floating point value into bytes, or to take a bunch of bytes and interpret as a long or a string, or … So,...
read more
Actually, that question is really contrary to why I used unions in the first place — the idea was to be able to access one type of data AS IF it was another type. So, for instance, to dissect a floating point value into bytes, or to take a bunch of bytes and interpret as a long or a string, or … So, in this use case, there is no *active* element — each element is just another way of interpreting the same chunk of memory. But, if you are using the union as a “catch all” type of structure, to be able to store any kind of value, but you need to know what type is stored there, then by all means add a “type” element to an enclosing struct, as suggested by others. read less
Comments
Dislike Bookmark

Related Questions

What is the difference between n=1 and n==1 in the C language?
'=' is ASSIGNMENT operator , where as '==' is COMPARISON operator. int a=7; assigns the variable a an integer value 7 , where as a==7; checks if the VALUE of a is EQUAL to 7.
Soujanya
0 0
View Comments8
Can we pass arguments in the main function in C language?
Yes. it is possible to pass arguments into the main function.
Mukesh
0 0
View Comments7
What is C language?
it is a computer programming language, supporting structured programming, lexical variable scope and recursion, while a static type system prevents many unintended operations
Uday
How do I execute the Java program?
javac nameofprogram.java java nameofprogram note***:Name of program should be same as that of your class name having main method *** above steps are used to execute programs on command line
Sharmistha
0 0
View Comments6
What is the actual size of INT in the C language, 2 or 4 bytes?
The actual size to int is determined by the compiler as the program runs. But theoretically the size is 2 bytes. You can increase the size by adding keyword long infront of it to make the size 4 bytes. Eg int a; // 2 bytes Long int b; // 4 bytes
Kunal

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

Ask a Question

Related Lessons

Be prepared to get trained--init
Before starting the training,students must be mentally prepared for acceptance of new knowledge. Students must attend training with open minded forgetting the position they are working.This will help...
S

Smartnub Softsolutions

0 0
View Comments0
Is It Fine To Write “void main()” Or “main()” In C/C++?
The definition: void main() { /* ... */ } Is not and never has been C++, nor has it even been C. See the ISO C++ standard 3.6.1 or the ISO C standard 5.1.2.2.1. A conforming...

Sunil Yadav

1 0
View Comments2
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
View Comments0
Functions In C Programming
A C-language program is nothing but collection of Function, these are the building blocks of a ‘C’ program. Generally, a function mans a task. “Function is a...

M Chandra Rao

0 0
View Comments0
C Programming basics
C PROGRAMMING BASICS 10 Hours Introduction to ‘ C’ programming –fundamentals – structure of a ‘C’...
O

Om K.

0 0
View Comments0

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 >

8 Hottest IT Careers of 2014!

Whether it was the Internet Era of 90s or the Big Data Era of today, Information Technology (IT) has given birth to several lucrative career options for many. Though there will not be a “significant" increase in demand for IT professionals in 2014 as compared to 2013, a “steady” demand for IT professionals is rest assured...

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 Mumbai
C Language Classes in Chennai
C Language Classes in Kolkata
C Language Classes in Ghaziabad
C Language Classes in Noida
C Language Classes in Jaipur

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