Re: Quick Help:'C' questions from an Electronic company

problem numbers 1,3,4,5 &6 are not so simple & easy as they looking.
No one problem is incorrect.  Any one who want to enter embedded 
world should know answers of these problems. 


--- In [email protected], Marcel <marcelsol@y...> wrote:
> 1) x>>=1; is not a valid C expression..
> 3) unsigned int a=6;
>  	int b= -20;
> is also not valid
> 
> by the way, why do want that? some of the questions
> you may just run and see what happened..
> the list is not here to do your homework
> 
> 
> --- khem metre <khhem9@y...> wrote:
> 
> > 
> > Hello friend ,
> > following are the C questions asked in an electronic
> > 
> > company.
> > Please answer the questions with description:
> > 
> > 
> > 
> > 
> > 1). What is the value of  X  after the execution  of
> > follwing  program 
> >       on a machine that uses 16 bit integers?
> > 
> > 	int x=0x8000;
> > 	x>>=1;
> > 
> > a) ox4000    b) 0xc000	 c) 0x0   d) None of the
> > above
> > 
> > 2). On a perticular machine a C compiler implements
> > 16
> > bit integerts and 8 bit characters.
> > 	
> > 	int a[10];
> > 	char *b;
> > 	int *c, *d;
> > 
> > 	b=(char *) a;
> > 	c=a;
> > 	b=b+4;
> > 	d=(int *)b;
> > 	c++;
> > what are data items to which b and c are pointing
> > now?
> > 
> > a) a[4] and a[1] 
> > b) a[2] and a[1] 
> > c) a[4] and a[2]
> > d) a[5] and a[2]
> > 
> > 3) Which is the correct output for follwing
> > program:-
> >          
> >    	unsigned int a=6;
> > 	int b= -20;
> > 	( a + b > 6 ) ? puts(">6") : puts("<=6");
> > 
> > a) >6
> > b) <=6
> > c) >6 and <=6
> > d) none of the above
> > 
> > 
> > 4) A program needs to use a value of PI (i.e.  3.14)
> > in calculation.
> >  How would you declare value of PI using a macro?
> > Note that highest possible resolution is desired.
> > 
> > 
> > 5).  following C code uses a keyword  interrupt   to
> > define an ISR . 
> > comment on the code.
> > 
> > 	interrupt double compute_area(radius)
> > 	double radius;
> > 	{ 
> > 		double area=PI * radius * radius;
> > 		return area;
> > 	}
> > 
> > 
> > 6)  Each of the alphabets stand for one digit, in
> > the
> > following sum. Find the values for each of the
> > alphabets. Indicate the logic used.
> > 	
> > 	F   O   R   T   Y
> >      +      T   E   N
> >      +      T   E   N
> >       -----------------------
> >     S   I   X   T   Y 
> >       ----------------------- 
> > 
> > 7)  following are some valid instructions for a
> > hypothetical microcontroller
> >  which result in loading the accumulator by 0.
> >  Which of these is most efficient?
> > i.   mov a,0
> > ii.  xor a,a
> > iii. mul a,0
> > iv.  sub a,a
> > 
> > a) i
> > b) ii
> > c) iii
> > d) iv 
> > 
> > 8) Two programs  develop 2 program modules a.c  and
> > b.c  independently 
> >  which are linked together.
> > 
> > File- a.c contains following code:-
> > static char a, b;
> > main()
> > {
> > 	fcall();
> > 	printf (" a=%d    b=%d  \n ", a , b);
> > }
> > 
> > File-    b.c    contains following code:-
> > extern int a,b;
> > void  fcall()
> > {
> > 	a=10;
> > 	b=20;
> > }
> > Which of the following is the likely output of the
> > program.
> > a) a=10	b=0
> > b) a=10	b=20
> > c) a=0	b=20
> > d) None as the linker would indicate an error
> > 
> > 
> > 9) Which of the following expression evaluations
> > would
> > be most efficient?
> > i. a=a*10;
> > ii. a=a*8+a*2;
> > iii. a=a<<3 + a<<1;
> > iv. a=a<<3 + a+a;
> > 
> > a) i
> > b) ii
> > c) iii
> > d) iv
> > 
> > 10) 	int a,b,c;
> > 	long d;
> > Which of the following expressions evaluate the
> > result
> > with minimum
> > loss of resolution.
> > i.  d=a/b*c;
> > ii. d=(long)a*c/b;
> > iii. d=(a/b)*c;
> > iv. d=(a*c)/b;
> > 
> > a) ii
> > b) iv
> > c) ii and iv
> > d) i
> > 
> > 11) Is the following piece of code incorrect ? If
> > incorrect rectify the errors.
> > 
> > 	long percent (a,b)
> > 	long a,b;
> > 	{
> > 	    long d;
> > 	    d=(a*100)/b;
> > 	    return d;
> > 	}
> > 
> > 	main()
> > 	{
> > 	   int marksob , per, total;
> > 	total=1400;
> > 	scanf( " enter the marks obtained ", marksob);
> > per=percent(marksob, total);
> > printf("percentage is %3d.%2d \n",per/100, per%100);
> > }
> > 
> > 12) using vatiable a, give definations for
> > following:-
> > example :- 1) An integer   
> >         		Answer:  int a;
> > 2) A pointer to an integer
> > 3) an array of 10 integers
> > 4) An array of 10 pointers to integers
> > 5) A pointer to an array of 10 integers
> > 6) A pointer to a function that takes an integer as
> > an
> > argument and returns an integer
> > 7) An array of ten pointers to functions that take
> > an
> > integer argument & return an integer.
> > 
> > 13) write a  C function in a program  to decide
> > whether the year is a leap year or not.
> >        Note:-  optimize the function for execution
> > time efficiency.
> > 
> > 
> > 14)  A 100 Km long highway has 1 milestone after
> >  every Km. 
> >        Total how many milestones are there?
> > 
> > 
> > 
> === message truncated ===
> 
> 
> 
> 		
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