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 C interview questions  C Interview Questions (2265)
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 Programming Languages AllOther interview questions  Programming Languages AllOther Interview Questions (648)
Question
how the compiler treats any volatile variable?Explain with 
example.
 Question Submitted By :: C
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
A volatile variable is one whose VALUE CAN CHANGE
UNEXPECTEDLY. Consequently, the compiler can make NO
ASSUMPTIONS about the value of the variable. In
particular, the optimizer must be careful to RELOAD the
variable every time it is used instead of holding a copy in
a register.
Examples of volatile variables are:

(a) Hardware registers in peripherals (e.g., status
registers)
(b) Non-stack variables referenced within an interrupt
service routine.
(c) Variables shared by multiple tasks in a multi-
threaded application.

Source: 10 Best Questions to would-be Embedded Programmers -
By Nigel Johns
 
Is This Answer Correct ?    5 Yes 0 No
Daniboy
 

 
 
 
Other C Interview Questions
 
  Question Asked @ Answers
 
Write a program which calculate sum of several number and input it into an array. Then, the sum of all the number in the array is calculated.   2
how can i print "hello"   3
compare array with pointer?   1
Study the code: void show() main() { show(); } void show (char *s) { printf("%sn",s); } What will happen if it is compiled & run on an ANSI C Compiler? A)It will compile & nothing will be printed when it is executed B)it will compile but not link C)the compiler will generate an error D)the compiler will generate a warning Accenture 4
Is the following code legal? struct a { int x; struct a b; }   4
Write a programm such that if user enter 11.25 it roundup to 11 but if user enter 11.51 upto 11.99 it will round up to 12 i.e.;convert the floting point value into integer format as explain above..   2
What is the difference between null pointer and void pointer CTS 6
7. Identify the correct argument for the function call fflush() in ANSI C: A)stdout B)stdin C)stderr D)All the above Accenture 10
Snake Game: This is normal snake game which you can find in most of the mobiles. You can develop it in Java, C/C++, C# or what ever language you know. TCS 7
How to add two numbers with using function? Miracle-Solutions 1
How Many Header Files in c? TCS 1
#include<string.h> void main() { String s1[]={"swathi"}; string s2[]={"maddimsetti"}; s1[]=s[]; printf("%s",s1[]); } IBM 2
 
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