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 C interview questions  C Interview Questions (2266)
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 Programming Languages AllOther interview questions  Programming Languages AllOther Interview Questions (652)
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
 
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what are the stages of compilation Bosch 1
Derive the complexity expression for AVL tree?   1
how can i make a program with this kind of output.. Enter a number: 5 0 01 012 0123 01234 012345 01234 0123 012 01 0 Wipro 4
In the following code segment what will be the result of the function, value of x , value of y { unsigned int x=-1; int y; y = ~0; if(x == y) printf("same"); else printf("not same"); } a) same, MAXINT, -1 b) not same, MAXINT, -MAXINT c) same , MAXUNIT, -1 d) same, MAXUNIT, MAXUNIT e) not same, MAXINT, MAXUNIT IBM 1
Write a program for print infinite numbers Wipro 3
can i know the source code for reversing a linked list with out using a temporary variable? Honeywell 6
second highest number in a given set of numbers TCS 3
Taking an example,differentiate b/w loader and linker ?   1
#include<stdio.h> main() { int a[3]; int *I; a[0]=100;a[1]=200;a[2]=300; I=a; Printf(%d\n, ++*I); Printf(%d\n, *++I); Printf(%d\n, (*I)--); Printf(%d\n, *I); } what is the o/p a. 101,200,200,199 b. 200,201,201,100 c. 101,200,199,199 d. 200,300,200,100   1
find largest element in array w/o using sorting techniques. Zycus-Infotech 3
how can i calculate mean,median,mode by using c program HCL 1
write a method for an array in which it can display the largest n next largest value. Value-Labs 1
 
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