M3-R4: PROGRAMMING & PROBLEM SOLVING (JULY 2019) THROUGH ‘C’ LANGUAGE with solution

 

(O-LEVEL
PAPER)

M3-R4:
PROGRAMMING & PROBLEM SOLVING (JULY 2019)

THROUGH
‘C’ LANGUAGE

PART
ONE

DURATION:
3 Hours                                                                                                M.M.100

 

ANSWER
ALL THE QUESTIONS:

1.      
Each question below gives a
multiple choice of answers. Choose the most appropriate one and enter in the
“OMR” answer sheet supplied with the question paper, following instructions
therein.                                                                                                                       (1×10)

 

1.
1 Which of
the following is a keyword used for a storage class?

 (A) printf

 (B) external

(C)
auto

 (D) scanf

 

        Explanation: – Storage class defines the location
and visibility of any variable. There are four types   

        of storage class :auto,extern,static
and register.

       1.2. Which pair of functions below are used for single character I/O?

       (A)
getchar() and putchar()

       (B) scanf() and printf()

       (C) input() and output()

       (D) None of these

 

       Explanation:-
getchar() is used 
read the single character input at run time whereas  putchar() is

       used to write the single character
output at runtime.

       1.3. What is the output of below
program?

void main(){

char*p=”Hello world”;

int*q;

p++;

q = (int*)p;

      q++;

printf(“n%sn%s”,p,q); }

 

        (A) ello world

               Ello world

        (B)
Compiler error

        (C) lo world

               lo world

        (D) ello world

               world

 

        Explanation:-
The above  program shows an compiler error.

 

        1.4. Which of the following is a Scalar
Data type?

        (A)
Float

        (B) Union

        (C) Array

        (D) Linked list

        Explanation:-A scalar
data structure is a data type which holds only a single atomic value at a
time.      

        commonly used scalar data type are:

·                    
Numeric

·                    
Character

·                    
Integer

·                    
Logical

·                    
Complex

     1.5. Header files in C contain:

    (A) Compiler commands

    (B) Library
functions

    (C) Header information of C
programs

    (D) Operator for files

 

    Explanation:-
In C, header files contains the predefined library functions.

 

    1.6. What is the binary number equivalent of
the decimal number 12?

    (A) 1100

    (B) 1010

    (C) 1001

    (D) 1110

     Explanation:-

                        1100
: 2³+2²+0+0= 12.

                        1010:
2³+0+2¹+0= 10.

                        1001 : 2³+0+0+2⁰=
9.

                        1110: 2³+2²+2¹+0=
14.

 

     1.7. Pointers are of :

      (A) integer data type

      (B) character data type

      (C) unsigned integer data types

      (D) none of these

 

      Explanation:-Pointer
can be of  int, char, array, function, or
any other type.

 

      1.8. In C, if you pass an array as an argument
to a function, what actually passed?

      (A) Value of elements in array

      (B) First element of the array

      (C) Base address of the array

      (D) Address of the last element of array

 

      Explanation:-
Whenever an array is passed to a function then the base address is passed to
the        

      function the other things
are calculated by it.

 

     1.9. Which of the following fopen() statements
is illegal in C ?

     (A) fp =
fopen(“abc.txt”, “r”);

     (B) fp =
fopen(“c:/user1/abc.txt”, “w”);

     (C) fp =
fopen(“abc”, “w”);

     (D) none of
the mentioned

 

     Explanation:-The
basic syntax for fopen():-

            FILE *fopen(const char
*file_name, const char *mode_of_operation);

 

    1.10. Which one of the following is not
akeyword in C language?

   (A) main

   (B) endl

   (C) float

   (D) switch

 

   Explanation:
– There are 32 keywords in C language. These are as
follows:

 

auto	double	int	struct
break	else	long	switch
case	enum	register	typedef
char	extern	return	union
continue	for	signed	void
do	if	static	while
default	goto	sizeof	volatile
const	float	short	unsigned

 

2.      
Each
statement below is either TRUE or FALSE. Choose the most appropriate one and
ENTER in the “OMR” answer sheet supplied with the question paper, following
instructions therein.

                                                                                                                                       (1×10=10)

 

2.1 Array
int a[5] can be used to store five character a, b, c, d and e into it.

TRUE

Explanation:
– inta[5] declares that
an  array has size of 5 and contains 5
elements in it.

 

2.2 C
language was initially designed and developed at Microsoft Corporation of USA.

 FALSE

Explanation:
– C was developed by Denis
Ritchie at AT & T Bell laboratory, in 1972.

 

2.3 A
semicolon must be placed after closing the conditional expression in a do-while
construct.

TRUE

Explanation:
– A semicolon (;) is
used to terminate the statement. Also it must be
placed after closing the conditional expression in a do-while construct.

 

 

2.4 Ternary
expression is a selective control construct.

TRUE

Explanation:
– Yes, Ternary expression is a
selective control construct. It works like a 
if – else statement.

The
syntax of conditional or ternary operator is as-

 

       variable = Expression1 ? Expression2 : Expression3

 

2.5 All the
functions, except main() function do not execute on their own, they require a
calling function.

FALSE

Explanation:
– All functions are called
recursively except main().

 

2.6
Recursive call is not allowed for main() function.

FALSE

Explanation:
– main () function can be
recursively called in C language. We can call main() within the main ()
function.

 

2.7 A
structure cannot contain the structure itself as its member.

FALSE

 

2.8
Pointers to pointers is a term used to describe pointers whose contents are the
address of another pointer.

TRUE

 

2.9 In C,
there is a function name strcat() used to concatenate two strings.

TRUE

 

2.10 Values
of predefined macros can be printed using printf statement in C program.

TRUE

 

3.       Match
words and phrases in column X with the closest related meaning/
word(s)/phrase(s) in column Y. Enter your selection in the “OMR” answer sheet
supplied with the question paper, following instructions therein.                                                                                       (1×10=10)

 

	X		Y
3.1	Keyword used to transfer control from a function back to the calling function	A.	fseek()
3.2	Statement used to go to the next iteration in a loop	B.	malloc()
3.3	Library function used to clear the specified buffer	C.	switch-case control
3.4	Relational operators cannot be used on	D.	loops control
3.5	Function that allocate and clear allocated memory	E.	Argument
3.6	If you have to use many if-else conditions, they can be  usually implemented by	F.	fflush()
3.7	A piece of information passed to a method	G.	for( ; ; )
3.8	Function that allocates memory but does not clear allocated memory	H.	Return
3.9	Function used for file pointer movement	I.	Continue
3.10	Unending loop if no break statement inside the body	J.	Break
		K.	main()
		L.	Structure
		M.	calloc()

 

Ans:

 

	X		Y
3.1	Keyword used to transfer control from a function back to the calling function	A.	Return
3.2	Statement used to go to the next iteration in a loop	B.	Continue
3.3.	Library function used to clear the specified buffer	C.	fflush()
3.4	Relational operators cannot be used on	D.	structure
3.5	Function that allocate and clear allocated memory	E.	calloc()
3.6	If you have to use many if-else conditions, they can be  usually implemented by	F.	switch-case control
3.7	A piece of information passed to a method	G.	argument
3.8	Function that allocates memory but does not clear allocated memory	H.	malloc()
3.9	Function used for file pointer movement	I.	fseek()
3.10	Unending loop if no break statement inside the body	J.	for( ; ; )
		K.	loop control
		L.	break
		M.	main()

 

4.       Each
statement below has a blank space to fit one of the words(s) and phrase(s) in
the list below.  

Choose the most appropriate
options, enter your choice in the “OMR” answer sheet supplied with the question
paper, following instructions therein.                                                              (1X10=10)

 

A.	Ternary	B.	sizeof	C	null
D.	void	E.	semicolon	F.	#
G.	increment	H.	extern	I.	static
J.	structure	K.	pointer to pointer	L.	reference
M.	getch()

 

4.1 C language is
suited for structure
programming.

4.2 An   extern   storage class can be used to declare global
variable known to all the functions in the

       life.

4.3 getch ()   function can be used to read a single
character.

4.4 The operator “++”
is known as   increment operator.

4.5 The sizeof operator can be used to
allocate memory space dynamically to variables during

    execution of a program.

4.6 A pointer to pointer variable
points to another pointer.

4.7 A function with
no return type is declared as void.     .

4.8 A function
prototype is always terminated by   semicolon   sign.

4.9 When a structure
is passed to a function, then it should pass by reference   .   

4.10 The conditional
operator (? : ) is a   ternary
operator.