QUESTIONS OF C OF IBM, AMDOCS, GOOGLE, FACEBOOK, VMWARE, DELL, SYNTEL, HSBC, REDHAT

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                         2.QUESTIONS
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1. Base class has some virtual method and derived class has a method with the same name. If we initialize the base class pointer with derived object; calling of that virtual method will result in which method being called?
a. Base method b. Derived method.
c. Error d. None of these


2. Given below are two sets of statements:(a) & (b). Select the correct observation:

a> const char *p="Hello"; p="World";
b> char * const p="Hello"; p[1]='P';

A. Both a & b are correct since non-const data/pointer is being changed in both cases.
B. Both a & b are wrong since const data/pointer cannot be changed once assigned.
C. a is correct, b is wrong.
D. a is wrong, b is correct.


3. void main ()
{
"Bunka"[2]='P';
}

Select the correct statement:
A. Error: lvalue required
B. Error: A string literal is a const char * and hence cannot be modified directly.
C. A string literal has the data type char * and hence cannot be modified.
D. The code compiles but memory access error at run-time.


4. Select all the correct statements about "Abstraction"
A. Assumes essential characteristics of an object to distinguish it from other kinds of objects.
B. Provides a simplified view of the object.
C. It separates the implementation from its interface.
D. It is the enforcement of the type class of an object.

5. The behavior of a class is decided by
A. Data members. B. Methods. C. Access permissions. D. All of the above.

6. Which statement(s) is/are true about "Static Typing"?
A. Refers to Types declared at compile time.
B. More efficient and reliable than dynamic typing.
C. Can be used to implement polymorphism.
D. Refers to all static data/methods in your classes.

7. Which statements(s) is/are true about Dynamic binding?
A. The correct function to call is resolved at run-time.
B. These functions are statically typed.
C. These functions are dynamically typed.
D. Refers to all dynamically allocated data in your classes.

8. Reusability of objects is achieved by
A. Inheritance. B. Aggregation. C. Polymorphism. D. All of the above.

9. Which statements(s) is/are true about "Hierarchy" of objects?
A. It is an ordering of abstractions.
B. It refers to "is a " relationship expressed by inheritance.
C. It refers to "has a" relationship expressed by aggregation.
D. It refers to access permissions on the aggregated object within an object.

10. What are "Generic classes"? (Select all that are correct)
A. A universal base class to cater to a wide range of derived classes.
B. A parameterized class, which is reusable across, types.
C. Used where implementation and behavior is independent of type.
D. Also known as abstract classes.

11. A language is "Object Base" if (Select all that are correct)
A. It supports abstraction. B. It has a concept of class.
C. It provides direct support for inheritance. D. All of the above.

12. "Object Persistence" covers which of the following (Select all that are correct)
A. Global variables & heap items. B. Object data storage.
C. Object type storage. D. All of the above.

13. Which statement(s) is/are true about shared inheritance?
A. All base classes are by default example of shared inheritance.
B. In multiple inheritances the derived classes share a single instance of the Base Class.
C. The base class is declared dynamically & there can be only one instance of it.
D. It allows distributed objects to share remote object and treat it as their own.


14. void f (int y)
{
struct s *ptr;
ptr = malloc (size of (struct)+99*size of (int));
}
struct s
{
int i;
float p;
};
when free (ptr) is executed, what will happen?

15. . Using pointer, changing A to B and B to A is swapping the function using two addresses and one temporary variable. a, b are address, t is temporary variable. How function look like?

16. Write a c program to find whether a stack is progressing in forward or reverse direction.

17. What is the output of the following program?
void main ()
{
char *ptr1="DCM0DAT\0ASYSTEMS";
clrscr ();
printf ("%d %s ", strlen (ptr1),ptr1);
printf ("%d %s ",strlen (ptr1+8),ptr1+8);
getch ();
}

18. How do you declare an array of N pointers to functions returning pointers to functions returning pointers to characters?

19. void main ()
{
char *s []={“dharma", "hewlett-packard", "siemens", "ibm"};
char **p;
p=s;
printf ("%s", ++*p);
printf ("%s", *p++);
printf ("%s", ++*p);
}

20. Which holds true for the following statement
class c: public A, public B
a) 2 member in class A, B should not have same name
b) 2 member in class A, C should not have same name
c) both
d) none

21. Given the following c program
func (int *i, int*j)
{*i=*i * *i;
*j=*j* *j;
}
main ()
{ int i = 5, j = 2;
func (&i, &j);
printf ("%d %d", i, j);
}
What is the output?

22. For the following C program
void insert (key, r)
type key key, data array r;
{extern int n;
if (n>=max) /*error table if full */
else r [n++]. k=key;
}
This on executing, enables a
a) Basic sequential search b) Binary search c) Interpolation search d) None

23. f (char *p)
{
p [0]? f (++p): 1;
printf ("%c", *p);
}
if call that function with f (Aabcd) what is the output??

24 In a class only declaration of the function is there but definition is not there then what is that function ?

25 What is the use of global static variable in C?

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                              2. ANSWERS
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1 (b)
15 swap (int *, int *, int)
18 The first part of this question can be answered in at least three ways:

a). char *(*(*a [N]) ())();

b) Build the declaration up incrementally, using typedefs:
typedef char *pc; /* pointer to char */
typedef pc fpc (); /* function returning pointer to char */
typedef fpc *pfpc; /* pointer to above */
typedef pfpc fpfpc (); /* function returning... */
typedef fpfpc *pfpfpc; /* pointer to... */
pfpfpc a [N]; /* array of... */

c) Use the cdecl program, which turns English into C and vice versa:
cdecl> declare a as array of pointer to function returning pointer to function returning pointer to char
char *(*(*a []) ())()
cdecl can also explain complicated declarations, help with casts, and indicate which set of parentheses the arguments go in (for complicated function definitions, like the one above).
Any good book on C should explain how to read these complicated C declarations "inside out" to understand them ("declaration mimics use").
The pointer-to-function declarations in the examples above have not included parameter type information. When the parameters have complicated types, declarations can *really* get messy. (Modern versions of cdecl can help here, too.)

19. "harma" (p->add (dharma) && (*p)->harma)
"harma" (after printing, p->add (hewlett-packard) &&(*p)->harma)
"ewlett-packard"
20. (a)
23. dcbaA (Just reversing the string)
24. virtual function

C language Paper of NIIT, IIT, INFOSYS, IBM, GOOGLE, YAHOO, CAPGEMINI, TCS, WIPRO, ASK.COM, DELL

1. The C language terminator is
(a) semicolon
(b) colon
(c) period
(d) exclamation mark

2. What is false about the following -- A compound statement is
(a) A set of simple statments
(b) Demarcated on either side by curly brackets
(c) Can be used in place of simple statement
(d) A C function is not a compound statement.

3. What is true about the following C Functions
(a) Need not return any value
(b) Should always return an integer
(c) Should always return a float
(d) Should always return more than one value

4. Main must be written as
(a) The first function in the program
(b) Second function in the program
(c) Last function in the program
(d) Any where in the program

5. Which of the following about automatic variables within a function is correct ?
(a) Its type must be declared before using the variable
(b) Tthey are local
(c) They are not initialised to zero
(d) They are global

6. Write one statement equivalent to the following two statements
x=sqr(a);
return(x);
Choose from one of the alternatives
(a) return(sqr(a));
(b) printf("sqr(a)");
(c) return(a*a*a);
(d) printf("%d",sqr(a));

7. Which of the following about the C comments is incorrect ?
(a) Ccommentscan go over multiple lines
(b) Comments can start any where in the line
(c) A line can contain comments with out any language statements
(d) Comments can occur within comments

8. What is the value of y in the following code?
x=7;
y=0;
if(x=6) y=7;
else y=1;
(a) 7
(b) 0
(c) 1
(d) 6

9. Read the function conv() given below
conv(int t){
int u;
u=5/9 * (t-32);
return(u);
}
What is returned
(a) 15
(b) 0
(c) 16.1
(d) 29

10. Which of the following represents true statement either x is in the range of 10 and 50 or y is zero
(a) x >= 10 && x <= 50 || y = = 0
(b) x<50
(c) y!=10 && x>=50
(d) None of these

11. Which of the following is not an infinite loop ?
(a) while(1)\{ ....}
(b) for(;;)
{
...
}
(c) x=0;
do{
/*x unaltered within the loop*/
.....}
while(x = = 0);
(d) # define TRUE 0
...
while(TRUE){
....}
 12. What does the following function print?
func(int i)
{ if(i%2)return 0;
else return 1;}
main()
{
int =3;
i=func(i);
i=func(i);
printf("%d",i);
}(a) 3
(b) 1
(c) 0
(d) 2

13. How does the C compiler interpret the following two statements
p=p+x;
q=q+y;

(a) p=p+x;
     q=q+y
(b)p=p+xq=q+y
(c)p=p+xq;
    q=q+y
(d)p=p+x/q=q+y For questions 14,15,16,17 use the following alternativesa.int
b.char
c.string
d.float
14. '9'
15. "1 e 02"
16. 10e05
17. 15
 18. Read the folllowing code# define MAX 100
# define MIN 100
....
....
if(x>MAX)
x=1;
else if(x<MIN)
x=-1;
x=50;
if the initial value of x=200,what is the value after executing this code?
(a) 200
(b) 1
(c) -1
(d) 50

19. A memory of 20 bytes is allocated to a string declared as char *s
then the following two statements are executed:
s="Entrance"
l=strlen(s);
what is the value of l ?
(a)20
(b)8
(c)9
(d)21

20. Given the piece of code
int a[50];
int *pa;
pa=a;
To access the 6th element of the array which of the following is incorrect?
(a) *(a+5)
(b) a[5]
(c) pa[5]
(d) *(*pa + 5}

21. Consider the following structure:
struct num nam{
int no;
char name[25];
}
struct num nam n1[]={{12,"Fred"},{15,"Martin"},{8,"Peter"},{11,Nicholas"}};
.....
.....
printf("%d%d",n1[2],no,(*(n1 + 2),no) + 1);
What does the above statement print?
(a) 8,9
(b) 9,9
(c) 8,8
(d) 8,unpredictable value

22. Identify the in correct expression
(a) a=b=3=4;
(b) a=b=c=d=0;
(c)float a=int b=3.5;
(d)int a; float b; a=b=3.5;

23. Regarding the scope of the varibles;identify the incorrect statement:
(a)automatic variables are automatically initialised to 0
(b)static variables are are automatically initialised to 0
(c)the address of a register variable is not accessiable
(d)static variables cannot be initialised with any expression

24. cond 1?cond 2?cond 3?:exp 1:exp 2:exp 3:exp 4;
is equivalent to which of the following?
(a)if cond 1
exp 1;
else if cond 2
exp 2;
else if cond 3
exp 3;
else exp 4;
(b) if cond 1
if cond 2
if cond 3
exp 1;
else exp 2;
else exp 3;
else exp 4;
(c) if cond 1 && cond 2 && cond 3
exp 1 |exp 2|exp 3|exp 4;
(d) if cond 3
exp 1;
else if cond 2 exp 2;
else if cond 3 exp 3;
else exp 4;
 25. The operator for exponencation is(a) **
(b) ^
(c) %
(d) not available

26. Which of the following is invalid
(a) a+=b
(b) a*=b
(c) a>>=b
(d) a**=b

27. What is y value of the code if input x=10
y=5;
if (x==10)
else if(x==9)
else y=8;
(a)9
(b)8
(c)6
(d)7

28. What does the following code do?
fn(int n,int p,int r){
static int a=p;
switch(n){
case 4:a+=a*r;
case 3:a+=a*r;
case 2:a+=a*r;
case 1:a+=a*r;}}
(a)computes simple interest for one year
(b)computes amount on compound interest for 1 to 4 years
(c)computes simple interest for four year
(d)computes compound interst for 1 year

29. a=0;
while(a<5)
printf("%d\\n",a++);
How many times does the loop occurs?
(a)infinite
(b)5
(c)4
(d)6

30. How many times does the loop iterated ?
for (i=0;i=10;i+=2)
printf("Hi\\n");
(a)10
(b) 2
(c) 5
(d) None of these

31. What is incorrect among the following
A recursive function
(a) calls itself
(b) is equivalent to a loop
(c) has a termination condition
(d) does not have a return value at all
 32. Which of the following go out of the loop if expn 2 becoming false(a) while(expn 1)\{...if(expn 2)continue;}
(b) while(!expn 1)\{if(expn 2)continue;...}
(c) do{..if(expn 1)continue;..}while(expn 2);
(d) while(!expn 2)\{if(expn 1)continue;..\}

33. Consider the following program
main()
{unsigned int i=10;
while(i>=0){
printf("%u",i)
i--;}
}
How many times the loop will get executed
(a)10
(b)9
(c)11
(d)infinite

34.Pick out the add one out
(a) malloc()
(b) calloc()
(c) free()
(d) realloc()

35.Consider the following program
main(){
int a[5]={1,3,6,7,0};
int *b;
b=&a[2];
}
The value of b[-1] is
(a) 1
(b) 3
(c) -6
(d) none

36. # define prod(a,b)=a*b
main(){
int x=2;
int y=3;
printf("%d",prod(x+2,y-10)); }
the output of the program is
(a) 8
(b) 6
(c) 7
(d) None

37.Consider the following program segment
int n,sum=1;
switch(n){
case 2:sum=sum+2;
case 3:sum*=2;
break;
default:sum=0;}
If n=2, what is the value of sum
(a) 0
(b) 6
(c) 3
(d) None of these

38. Identify the incorrect one
1.if(c=1)
2.if(c!=3)
3.if(a<b)then
4.if(c==1)
(a) 1 only
(b) 1&3
(c) 3 only
(d) All of the above

39. The format specified for hexa decimal is
(a) %d
(b) %o
(c) %x
(d) %u

40. Find the output of the following program
main(){
int x=5, *p;
p=&x
printf("%d",++*p);
}
(a) 5
(b) 6
(c) 0
(d) none of these

41.Consider the following C code
main(){
int i=3,x;
while(i>0){
x=func(i);
i--; }
int func(int n){
static sum=0;
sum=sum+n;
return(sum);}
The final value of x is
(a) 6
(b) 8
(c) 1
(d) 3

43. Int *a[5] refers to
(a) array of pointers
(b) pointer to an array
(c) pointerto a pointer
(d) none of these

44.Which of the following statements is incorrect
(a) typedef struct new{
int n1;
char n2;
} DATA;
(b) typedef struct {
int n3;
char *n4;}ICE;
(c) typedef union{ int n5;
float n6;} UDT;
(d) #typedef union {
int n7;
float n8;} TUDAT;