Index

CHAPTER 1 EXERCISE:

[A] Which of the following are invalid variable names and why?

[B] Point out the errors, if any, in the following C statements:

[C] Evaluate the following expressions and show their hierarchy.

[E] Convert the following equations into corresponding C statements.

[F] What would be the output of the following programs:

[G] Pick up the correct alternative for each of the following questions:

[H] Write C programs for the following:



CHAPTER 2 EXERCISE:

[A] What would be the output of the following programs:

[B] Point out the errors, if any, in the following programs:



 

Chapter 1: [A] Which of the following are invalid variable names and why?

BASICSALARY    _basic   basic-hra
#MEAN      group.   422
population in 2006      over time    mindovermatter
FLOAT      hELLO   queue.
team’svictory    Plot # 3   2015_DDay

BASICSALARY               Valid

_basic                             Valid

basic-hra                         ( - not allowed)

#MEAN                           ( # not allowed)

group.                             (  . not allowed)

422                                 ( only digits not allowed)

population in 2006          ( spaces not allowed)

 
over time                        ( spaces not allowed)

mindovermatter             Valid    

queue.                            (  . not allowed)

team’svictory                  (   '  not allowed)

Plot # 3                           ( spaces and # not allowed)

2015_DDay                    ( starting with digits not allowed)

Chapter 1: [B] Point out the errors, if any, in the following C statements:

(a)  int = 314.562 * 150 ;

C keyword is used as variable name. 



(b)  name = ‘Ajay’ ;

Char can only store 1 character.Also only single sided single quotes are used to enclose char.



(c)  varchar = ‘3’ ;

only single sided single quotes are used to enclose char.

varchar = '3' ; is correct

(d)  3.14 * r * r * h = vol_of_cyl ;

One and only one variable can be at the left side of an expression.



(e)  k = ( a * b ) ( c + ( 2.5a + b ) ( d + e ) ;

It is assumed that arithmetic operators (*) are already present. When they are not



(f)  m_inst = rate of interest * amount in rs ;

No spaces are allowed in c variable names.



(g)  si = principal * rateofinterest * numberofyears / 100 ;

No error

(h)  area = 3.14 * r ** 2 ;

(*) is repeated        

area = 3.14 * r * 2 ;is corect



(i)  volume = 3.14 * r ^ 2 * h ;

There is no exponential operator in C.



(j)  k = ( (a * b ) + c ) ( 2.5 * a + b ) ;

(*) is missing

k = ( (a * b ) + c ) *( 2.5 * a + b ) ; is correct.

(k)  a = b = 3 = 4 ;

A single variable can not store more than one values.



(l)  count = count + 1 ;

No error

(m)  date = '2 Mar 04' ;

Char can only hold a single character.

Chapter 1: [C] Evaluate the following expressions and show their hierarchy.

(a)  g = big / 2 + big * 4 / big - big + abc / 3 ;
(abc = 2.5, big = 2, assume g to be a float)

2 / 2 + 2 * 4 / 2 - 2 + 2.5 / 3;  

1 + 2 * 4 / 2 - 2 + 2.5 / 3;

1 + 8 / 2 - 2 + 2.5 / 3;

1 + 4 - 2 + 2.5 / 3;

1 + 4 - 2 + 0; 

 5 - 2 + 0;

3+ 0

3

so

g = 3

(b)  on = ink * act / 2 + 3 / 2 * act + 2 + tig ;
(ink = 4, act = 1, tig = 3.2, assume on to be an int)

4 * 1 / 2 + 3 / 2 * 1  + 2 + 3.2

4 / 2 + 3 / 2 * 1  + 2 + 3.2

2 + 3 / 2 * 1  + 2 + 3.2

2 + 1 * 1  + 2 + 3.2 

2 + 1  + 2 + 3.2

3 + 2 + 3.2

5  + 3.2

  
8

so

on = 8

(c)  s = qui * add / 4 - 6 / 2 + 2 / 3 * 6 / god ;
(qui = 4, add = 2, god = 2, assume s to be an int)

4 * 2 / 4 - 6 / 2 + 2 / 3 * 6 / 2 

8 / 4 - 6 / 2 + 2 / 3 * 6 / 2 

2 - 6 / 2 + 2 / 3 * 6 / 2 

2  - 3 + 2 / 3 * 6 / 2 

2 - 3 + 0 * 6 / 2 

2 - 3 + 0 / 2

2 - 3 + 0 

-1 + 0

-1 

so

s= -1

 
(d)  s = 1 / 3 * a / 4 - 6 / 2 + 2 / 3 * 6 / g ;
(a = 4, g = 3, assume s to be an int)

1 / 3 * 4 / 4 - 6 / 2 + 2 / 3 * 6 / 3

0 * 4 / 4 - 6 / 2 + 2 / 3 * 6 / 3 

0 / 4 - 6 / 2 + 2 / 3 * 6 / 3 

0 - 6 / 2 + 2 / 3 * 6 / 3 

0 - 3 + 2 / 3 * 6 / 3

0 - 3 + 0 * 6 / 3

0 - 3 + 0 / 2

  
0 - 3 + 0

-3 +0

-3 

so 

s = -3

Chapter 1: [E] Convert the following equations into corresponding C statements.

 
corresponding C  statement:

Z = ( 8.8 * ( a + b ) * 2 / c - 0.5 +2 * a / ( q + r ) ) / ( ( a + b ) * ( 1 / m ) )

corresponding C  statement:

X = (-b + ( b * b ) + 2 * (4*a*c) ) / ( 2*a )

corresponding C  statement:


R =( 2 * v + 6.22 * ( c + d ) ) / ( ( g + v ) )










corresponding C  statement:
A = ( 7.7 * b * ( x * y + a ) / c - 0.8 ) / ( ( x + a ) * ( 1 / y ) )

Chapter 1: [F] What would be the output of the following programs:

(a)

main( )

{

int   i = 2, j = 3, k, l ;

float   a, b ;

k = i / j * j ;

l = j / i * i ;

a = i / j * j ;

b = j / i * i ;

printf( "%d %d %f %f", k, l, a, b ) ;

}

Output

0 2 0.000000 2.000000

(b)
 
main( )

{

int  a, b ;

a = -3 - - 3 ;

b = -3 - - ( - 3 ) ;

printf ( "a = %d b = %d", a, b ) ;

}

Output

a = 0 b = -6

(c)

main( )

{

float a = 5,  b = 2 ;

int c ;

c = a % b ;

printf ( "%d", c ) ;

}

Output

modulus operator can not be used between floats.

Compiler will give the error and there will be no output.

(d)

main( )

{

printf ( "nn \n\n nn\n" ) ;

printf ( "nn /n/n nn/n" ) ;

}

Output

nn

 nn

nn /n/n nn/n

(e) 

main( ) 

{ 

int a, b ; 

printf ( "Enter values of a and b" ) ; 

scanf ( " %d %d ", &a, &b ) ; 

printf ( "a = %d b = %d", a, b ) ; 

} 

 

Output

Enter values of a and b

1

2

a = 1 b = 2 

(f) 

main( ) 

{ 

int p, q ; 

printf ( "Enter values of p and q" ) ; 

scanf ( " %d %d ", &p, &q ) ; 

printf ( "p = %d q =%d", p, q ) ; 

} 

Output

Enter values of p and q

5 10

p=5 q=10

Chapter 1: [G] Pick up the correct alternative for each of the following questions:

(a)  C language has been developed by

(1)  Ken Thompson
(2)  Dennis Ritchie
(3)  Peter Norton 
(4)  Martin Richards



(b)  C can be used on

(1)  Only MS-DOS operating system
(2)  Only Linux operating system
(3)  Only Windows operating system
(4)  All the above




(c)  C programs are converted into machine language with the
help of

(1)  An Editor
(2)  A compiler
(3)  An operating system
(4)  None of the above



 
(d)  The real constant in C can be expressed in which of the
following forms

(1)  Fractional form only
(2)  Exponential form only
(3)  ASCII form only

(4)  Both fractional and exponential forms 

(e)  A character variable can at a time store

(1)  1 character
(2)  8 characters
(3)  254 characters
(4)  None of the above





(f)  The statement char ch = ‘Z’ would store in ch

(1)  The character Z
(2)  ASCII value of Z
(3)  Z along with the single inverted commas
(4)  Both (1) and (2)






(g)  Which of the following is NOT a character constant

(1)  ‘Thank You’
(2)  ‘Enter values of P, N, R’
(3)  ‘23.56E-03’
(4)  All the above 





(h)  The maximum value that an integer constant can have is

(1)  -32767
(2)  32767
(3)  1.7014e+38
(4)  –1.7014e+38




(i)  A C variable cannot start with

(1)  An alphabet
(2)  A number
(3)  A special symbol other than underscore
(4)  Both (2) & (3) above






(j)  Which of the following statement is wrong

(1)  mes = 123.56 ;
(2)  con = 'T' * 'A' ;
(3)  this = 'T' * 20 ;
(4)  3 + a = b ;





(k)  Which of the following shows the correct hierarchy of
arithmetic operators in C

(1)  **, * or /, + or -
(2)  **, *, /, +, -
(3)  **, /, *, +, -
(4)  / or *, - or +




(l)  In b = 6.6 / a + 2 * n ; which operation will be performed
first?

(1)  6.6 / a
(2)  a + 2
(3)  2 * n
(4)  Depends upon compiler




(m)  Which of the following is allowed in a C Arithmetic
instruction

(1)  [ ]
(2)  { }
(3)  ( )
(4)  None of the above






(n)  Which of the following statements is false

(1)  Each new C instruction has to be written on a separate
line
(2)  Usually all C statements are entered in small case letters 
(3)  Blank spaces may be inserted between two words in a C
statement
(4)  Blank spaces cannot be inserted within a variable name






(o)  If a is an integer variable, a = 5 / 2 ; will return a value

(1)  2.5
(2)  3
(3)  2
(4)  0





(p)  The expression, a = 7 / 22 * ( 3.14 + 2 ) * 3 / 5 ; evaluates to

(1)  8.28
(2)  6.28
(3)  3.14
(4)  0





(q)  The expression, a = 30 * 1000 + 2768 ; evaluates to

(1)  32768
(2)  -32768
(3)  113040
(4)  0 



(r)  The expression x = 4 + 2 % - 8 evaluates to

(1)  -6
(2)  6
(3)  4
(4)  None of the above




(s)  Hierarchy decides which operator

(1)  is most important
(2)  is used first
(3)  is fastest
(4)  operates on largest numbers




(t)  An integer constant in C must have:

(1)  At least one digit  
(2)  Atleast one decimal point
(3)  A comma along with digits
(4)  Digits separated by commas





(u)  A character variable can never store more than

(1)  32 characters
(2)  8 characters
(3)  254 characters
(4)  1 character




(v)  In C a variable cannot contain

(1)  Blank spaces
(2)  Hyphen
(3)  Decimal point
(4)  All the above





(w)  Which of the following is FALSE in C

(1)  Keywords can be used as variable names
(2)  Variable names can contain a digit
(3)  Variable names do not contain a blank space
(4)  Capital letters can be used in variable names





(x)  In C, Arithmetic instruction cannot contain

(1)  variables
(2)  constants
(3)  variable names on right side of =
(4)  constants on left side of =





(y)  Which of the following shows the correct hierarchy of
arithmetic operations in C

(1)  / + * -
(2)  * - / +
(3)  + - / *
(4)  * / + -




(z)  What will be the value of d if d is a float after the operation
d = 2 / 7.0?

(1)  0
(2)  0.2857
(3)  Cannot be determined
(4)  None of the above