Quick Help:'C' questions from an Electronic company

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.  3.1400)
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?


15) Convert following C program fragment into any of
the assembly languages you know:
	Note that a and b are character variables,
 and c is an integer variable.
	if (a) 
	       d++;
	else 
	          if (c)
		d - -;
                            else
		d=0;





		
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