What is the 'volatile' qualifier?

Asked by Last Modified  

3 Answers

Learn C Language

Follow 1
Answer

Please enter your answer

Shyam Shrivastava

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

What will the pre-processor do for a program?
The pre processor takes a look at your source code just before it goes off to the compiler, does a little formatting, and carries out any instructions you have given it. Each # command that the preprocessor...
Neel
0 0
6
How do I learn C programming easily?
Just follow kanitkar book of c programming for beginners
Harsh
0 0
5
What is a pragma?
In computer programming, a directive pragma is a language construct that specifies how a compiler should process its input. The ' #pragma ' directive is the method specified by the C standard for providing...
Anil
What is the difference between text and binary modes?
FILE WHEN SAVED IN TEXT MODE ON HARD DISK IS READABLE BUT WHEN SAVED IN BINARY MODE IS NOT READABLE IT IS SAVED IN BINARY FORMAT
Raj
I’ve been learning C language for 3 weeks but it’s becoming more difficult. As a result, I’m becoming lazy. What should I do to motivate myself?
Learn algorithm or flowchart first. Once you start C, try to relate with real time example. Example: When learn printf() , think about a a bill where you customer information is printed. Similarly when...
Akhilesh
0 0
5

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

Ask a Question

Related Lessons

Learn to code from an Engineer || Linear search || Python

Syed Chintu

0 0
0
C Program-Vowels and Consonants
/*WAP to print the character entered by user is a vowel or consonant*/ //Header files #include<stdio.h>#include<conio.h> //Main functionvoid main(){ char c; //Function for clearing screen...

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
Efficient Learning Strategies
Type your notes after class Write your notes onto flashcards - Scrabble -Make posters Review flashcards while walking, at gym, etc. Dog-ear pages in the reading where you can find...

Vijith V T

1 0
0
C for Begginers
C is an procedure oriented programming language. For any begginer the word program is new. Program: Set of instructions to be followed by machine or computer. Instruction Examples: Arithmetic instruction...

Sonali K.

5 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 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