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 > What is the 'volatile' qualifier?
✕

Search in

What is the 'volatile' qualifier?

Asked by Last Modified  

3 Answers

Learn C Language

Follow 1
Answer

Please enter your answer

In computer programming, the volatile qualifier is used to indicate to the compiler that a variable can be changed by some external entity that is not explicitly specified in the program. It is primarily used when working with multi-threaded or embedded systems where variables can be modified by hardware,...
read more
In computer programming, the volatile qualifier is used to indicate to the compiler that a variable can be changed by some external entity that is not explicitly specified in the program. It is primarily used when working with multi-threaded or embedded systems where variables can be modified by hardware, interrupts, or other threads outside of the normal flow of program execution. The volatile keyword informs the compiler not to optimize access to the variable by caching its value in a register or by reordering memory accesses. This is because the value of a volatile variable can change at any time due to external factors that the compiler may not be aware of, so it needs to be re-read from memory every time it is accessed. Here's an example in C/C++: volatile int sensorValue; // Declare a volatile integer variable int main() { while (1) { // Read the volatile variable int reading = sensorValue; // Perform some operations with the reading // Compiler won't optimize away the reading } return 0;} read less
Comments
Dislike Bookmark

In computer programming, the volatile qualifier is used to indicate to the compiler that a variable can be changed by some external entity that is not explicitly specified in the program. It is primarily used when working with multi-threaded or embedded systems where variables can be modified by hardware,...
read more
In computer programming, thevolatilequalifier is used to indicate to the compiler that a variable can be changed by some external entity that is not explicitly specified in the program. It is primarily used when working with multi-threaded or embedded systems where variables can be modified by hardware, interrupts, or other threads outside of the normal flow of program execution. Thevolatilekeyword informs the compiler not to optimize access to the variable by caching its value in a register or by reordering memory accesses. This is because the value of a volatile variable can change at any time due to external factors that the compiler may not be aware of, so it needs to be re-read from memory every time it is accessed. Here's an example in C/C++: volatile int sensorValue; // Declare a volatile integer variable int main() {while (1) {// Read the volatile variableint reading = sensorValue;// Perform some operations with the reading// Compiler won't optimize away the reading}return 0;} read less
Comments
Dislike Bookmark

C language Faculty (online Classes )

The volatile qualifier declares a data object that can have its value changed in ways outside the control or detection of the compiler (such as a variable updated by the system clock or by another program).
Comments
Dislike Bookmark

View 1 more Answers

Related Questions

Is it good practicing c++ in code blocks instead of turbo c++?
Practicing/working on Turbo C++ is always good..because its hard to do comparatively 'code blocks'. seems 'code blocks' has been designed by considering the latest working tools(like Visual Studio from...
Santosh
How can you check to see whether a symbol is defined?
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).
Name
in c : i want run time input: data=[name:raj,age:20] output: value[0]=raj value[1]=20 i want c code
Make use of Command line argument and access using argv,argc.
Vanaraj

What is void main () into main and what it does?
Void means nothing or empty. void main() - means here main() return nothing.int main() - means here main() returns an integer value.
Noreen
How to improve my c knowledge........
practice it as much as possible. for beginning, use let us c by yashwant kanetkar
Anish

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

Ask a Question

Related Lessons

An Interesting discussion about malloc( ) and calloc( )
What are malloc( ) and calloc( )? Simply putting they are the predefined functions in C language. Malloc( ) and calloc( ) are two such functions which are used for more or less identical purpose and...

Shiladitya Munshi

0 0
0
Why Indexing Should Start From Zero In Array ?
Why numbering should start at zero? To denote the subsequence of natural numbers 2, 3, ..., 12 without the pernicious three dots, fourconventions are open to usa) 2 ≤ i < 13b) 1 < i ≤ 12c)...

Sunil Yadav

0 0
0
C Program Sample Application
//Standard Library Functions(Header Files used) #include<stdio.h> #include <conio.h> //Main method int main() { // function for clearing screen clrscr(); // function to print the output...

Salim Ahmed Ansari

0 0
0
Tips of learning Java Language/Other Programming Languages
1.You should know the basic concept: If we talk about programming languages so basic concept are same in all the high level languages. So you should know the basic concept firstly then you can easily understand...
I

ICreative Solution

0 0
0
Can we store different data types in a stack?
Yesterday, one of my Facebook friend asked me this question. My answer is "yes", and in this post I will discuss how could we do this.I am a great supporter of working with unions and I will be using union...

Shiladitya Munshi

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 >

Make a Career in Mobile Application Programming

Almost all of us, inside the pocket, bag or on the table have a mobile phone, out of which 90% of us have a smartphone. The technology is advancing rapidly. When it comes to mobile phones, people today want much more than just making phone calls and playing games on the go. People now want instant access to all their business...

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 >

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 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