Note: The star ì mark contained question specify that they are most likely to come in examination and very important. But I suggest you to read all the questions that I post on my site. |
OBJECTIVE TYPE QUESTIONS
1. Fill in the blanks:
a) The variable is portion of memory used to store a value.
b) The compiler specific keywords words cannot be used as a name of an
identifier.
c) The
fundamental data types in c are integer, floating numbers, characters and string.
d) The
real constant can be written in Decimal and E character.
e) Each
variable declared as float requires four bytes
of storage.
f) unsigned types can be represented only positive values
including zero.
g) The named portion of memory stores a
value at the time of declaration of the variable.
h) Constant refers to a fixed value that does not change
during the execution of a program.
i) If
there is no sign before an integer constant, it assumed to have a plus sign.
j) An
octal number is preceded by Zero characters.
¬ To display size of any data
types, we take help of sizeof special operator.
¬ Void indicate nothing.
¬ For integers type of data 4
or 2 bytes of memory is allocated.
¬ For float type of data 4
bytes of memory is allocated.
¬ For double type of data 8
bytes of memory is allocated.
¬ For char type of data 1 bytes of memory is allocated.
¬ For void type of data 1
or 0 bytes of memory is allocated.
¬Constants are also known as Literal.
¬ Non- primitives’ data types are also called
as derive, complex, or compose data types.
2. Write true or false:
a) The
identifier name can start with numeric value. FALSE
b) Signed
data type can represent only positive values. FALSE
c) Signed
and unsigned specifiers are always written before the data type. FALSE
d) You can
change the value of a constant during execution of a program. FALSE
e) Integer constant can only be written in decimal numbers. FALSE
f) The
hexadecimal number is preceded b 0. TRUE
g) A
string constant consist of more than one character enclosed in single quotes. FALSE
h) Escape
sequence code is a special non graphical character preceded by a backslash. TRUE
i) Type
casting allows conversion of none data type into another.TRUE
j) scanf() is used for reading the data input through the keyboard. TRUE
3. Choose the correct options:
a) A C
keyord. All of these
b) The
portion of memory used to store a value. Variable
c) Which
one is a correct identifier in C? total_1
d) Which
one in not a built-in data type? CHAR
e) Which
one is not correct way of defining data type? Inta;b;
f) Data
type of “ADD” is int
g) Data
type of 37.56 is float
h) Data
type of -34 is int
i) Which
one is not a character constant. “8”
j) Which
one is not a correct integer constant in C? 1,776
DESCRIPTIVE TYPE QUESTIONS
A. Short answer questions:
1) What
are C keywords?
C keywords are the reserved words that
have predefine meaning in a programming language for a specific task. C has
total 32 reserved words. They are given below:
|
auto |
double |
int |
struct |
|
break |
else |
long |
switch |
|
case |
enum |
register |
typeof |
|
const |
extern |
return |
union |
|
continue |
float |
short |
unsigned |
|
default |
for |
signed |
volatile |
|
do |
goto |
sizeof |
void |
|
|
if |
static |
while |
2) Mention
the name of any two built-in data types.
The name
of two built in data type are integers and characters
3) Which
of the following are valid constant? If valid, specify whether integers or
real.
|
i)
0.5 →Invalid ii)
9.2e – 0.5→Valid, real constant iii)
1234567 →Valid integer constants iv)
012CDF →Invalid v)
0X87e3h →Valid, real constant vi)
12345678L→ Valid, Integer constants. |
4) What do
you mean by constant in C language?
Constant refers to a fixed value that does not change during the execution of the program. It also known as literals.
5) What
are the two ways of defining constant in a C program?
The two ways of defining constant
in a C program are:
i) Using #define
ii) Using const Keyword.
6) Which
of the following are a valid character constant.
‘a’ and $ are the valid characters constant.
g) While
writing integer constants, how they are decimal, octal and hexadecimal
constants distinguish from one another?
While writing integer constants:
The decimal constants are
distinguished by valid integer which consists of 0 to 9.
An octal number is preceded
by a 0. And
A hexadecimal number is preceded by the characters 0x or 0X.
7) What is
an escape sequence? Name any two escape sequence codes in C.
Escape sequence are special non-graphical characters preceded by a backslash. Any two escape sequence are \n and \r
8) Name
the two types of C datatype conversion.
The two data type conversion in C
are:
i. Implicit
ii. Explicit
9) What is
the use of type casting?
Type casting is used to convert the
data type of one operand to another data.
B. Long answer questions:
1. List
the rules for naming an identifier.
The rules or guidelines for writing
identifier name are given below:
i) Identifier should be meaningful
and descriptive.
ii) Keywords should never be used
as an identifier.
iii) The first character must be an
alphabets or underscore.
iv) The first character should not
be a number.
v) All succeeding characters can be
alphabets, a digit, or underscore.
vi) No special characters are
allowed excepts underscore. Not even space.
vii) More then one successive
underscore should not be used.
viii) More than one identifier
names should not be same in the same scope.
ix) Identifier are case sensitive.
2. Which
of the following are valid identifiers? If not give reasons.
|
i)
emp-name → Invalid, because cannot use symbols -. ii)
pinCode→ Valid iii)
emp name → Invalid, because cannot use space. iv)
Emp_name → Valid v)
$pay→ Invalid, because cannot used special characters. vi)
2file→ Invalid, because cannot start with numeric vii)
Name→ Valid viii)
Record1: Valid ix)
123name→ Invalid, because cannot start with numeric x)
1 Address→ Invalid, because cannot start with numeric, also
cannot use space. |
3. What
are Constants in C? Name the various C constant with examples.
Constant refers to the fixed values
that do not change during the execution of a program. A constant can be a
numbers, character, or character, or characters string that can be used as a
value in program. Below are the different types of constants we can use in C.
i) Integer constant: It
consists of digits 0 to 9 (whole number). Integer constant are of three types:
* Decimal constant (base 10)
→ 0 to 9 Example: 23,72, 333, +790, -234
* Octal Constant (base 8) →
0 to 8 Example: 012, 0113, 011
* Hexadecimal (base 16) → (0
to 9, A to F) Example: 01A, 0FB, )x4B
ii) Real Constant: Number
with a decimal point are called real constant. It is also known as Float Value.
*
It consists of digits 0 to 9. Example: 3.2, 3.1415,
6.02e23, 345.171
iii) Character constant → A
character constant represent single alphabet, digit, or a single symbol
enclosed within a pair of quotes (‘’).
*
Example: ‘A’, ‘1’, ‘#’
iv) Strings character constants:
A string constant is a sequence of characters enclosed in pair of double quotes
(“”).
*
Example: “Hello”,
“How are You”, “p”
4. List
the rules that apply to an integer constant?
The rules for using the integer
constant are:
i. It consists of digits 0 to 9.
ii. It must not have decimal point.
iii. It does not include commas and
blank space.
iv. We can add plus (+) or minus
(-) sign if needed. if there is no sign, it assumed to have positive value a
plus sign (+).
v. The allow range for constant is
-32768 to 32767.
5. Lists
the rule that apply to a real constant?
The rules for using the real
constant are:
i. It consists of digits 0 to 9.
ii. It must have decimal point.
iii. It does not include commas and
blank space.
iv. We can add plus (+) or minus
(-) sign if needed. if there is no sign, it assumed to have positive value a
plus sign (+).
v. The allow range for constant is
-32768 to 32767.
6. How do
string constant differ from character constant?
The different between string
constant and character constant is that:
Character constant can only be
represented as a single character. Whereas, string constant is an array of
characters with a null character at the end of the string.
7. Write
appropriate declaration for each of the following groups of variables in C.
Integer
variable: x,y
Real
variable:a,b,c
Character
variables: p,q,r
|
Declaration for each of the following groups of
variables in C are as follows: Int
x,y; float
a,b,c; char
‘p’, ‘q’, ‘r’; |
8. Write
appropriate declaration and assign the given initial values for the following
variables
Floating
point variables: a= -4.6, b= 0.05
Integer variables:
x=2, y= 121, z= -5
Character
variables: l1 = ‘c’, h2= ‘o’
|
Declaration and assign of the given initial values
for the following variables are: float
a = -4.6, b= 0.05; int
x = 2, y = 121, z = -5; char
l1= ‘c’, h2 = ‘0’ |
9. A C
program has the following declaration:
int I,j;
long int ix; short s; float x; double dx; char c;
Determine
the type of each of the following expressions:
i. i+c ii. int(dx) + ix iii. x+i
iv. dx + x v. x + c vi. s + c
|
i)
i+ c → Integer ii)
int(dx) + ix → long double iii)
x+i → float iv)
dx + x → double v)
x + c → float vi)
s + c → int |
10. Match
the following:
|
i.
Function Xmain() ii.
Character Constant A iii. Format Specifier %d%f%c iv.
Input Function scanf() v.
Output functionprintf() vi.
Address of operator & vii.
Statement terminator ; viii.
Escape sequence \n ix.
Integer Constant 2365 x.
Exponent form 4E-2 |
11. Check
the correct syntax of the following C program:
#include
<stdio.h>
Int main()
{
Int a,b;
printf(“
Enter two numbers”);
scanf(“%d%d”,a,b);
printf(“You
entered %d%d”,ab);
return0;
}
|
#include
<stdio.h> Int
main() { Int
a,b; printf(“
Enter two numbers”); scanf(“%d%d”,&a,&b);
/*→ Error is here required address in variables in
scanf()*/ printf(“You
entered %d%d”,ab); return0; } |
Additional Questions:
¬What is tokens?
A smallest unit of any programing
language is called as tokens (word).
OR
Tokens are building block of C
programming.
OR
A meaningful combination of C
characters is known a C tokens.
OR
In passage of text, individual
words and punctuation marks are called as tokens.
¬What are the six types of tokens?
The six types of tokens are:
i) Comment
ii) Keywords and Data type
iii) Identifiers
iv) Constants and Variables
v) String, Symbol and Characters
vi) Operators
¬What are the primary or built-in or
fundamental data types?
The built-in or fundamental data
types are
i. integer
ii. float type
iii. void type.
¬What is integral widening conversation?
Whenever char or short int appears
in an expression, it is converted to int. this is called integral widening
conversation.
¬ What is initialization?
Initialization is the method of
assigning the value and defining the data type at the same time.
¬What are Variables?
Variable are those who assign the
value in itself.
OR
It is a data name that refers to a
memory location where data value may be store.
¬What do you mean be declaration and
definition of a variable?
Declaration means announcing the
properties of a variable to the compiler like
i. Size of a variable
ii. Name of Variable.
Definition: means allocating memory
to a variable.
¬ What is string constant and character
constant?
String constant is a sequence of
characters enclosed within the pairs of double quotes. For Example: “Hello”. It
is a string. Whereas,
Character constant is a single
character including all the alphanumeric characters (A to Z, a to z, 0to 9) and
other character such as *,#,@,!, & etc.
¬Name the two types of data types which are used
to store and process different types of data type in C.
To process and store different
types of data C provide two different types of data type. They are
i. Primitive’s data types
ii. Non primitive data type (it is
also called as derive, complex, or compose data types).
¬How many types of data type are available in
C language? Name them.
There are six types of data types
available in C language. they are:
i. int indicate integer or whole numbers.
ii. float and double indicate real
number or fractional numbers with decimal point
iii. char indicate character type
of data, single character, digits or symbol enclosed with single quotations.
iv. Void indicate noting
¬ What is the use of Data types modifier? How
does it help?
Data type modifier is used to
modify the properties of primitives or basic data types excepts float and void
data types according to the application requirements. With the help of data
types modifiers we can:
i. Modify the size of (i.e the
amount of memory to be allocated).
ii. Modify the size (i.e. decide
only +ve or both +ve and -ve can be stored).
¬How many types of data types modifier are
there? Name them with theirs uses?
There are 4 types of data types
modifiers. They are:
i. Short and Long: short and long
modifier are used to modifies the size of primitive’s data type.
Short and long are used to increase
and decrease the size of primitive’s data type.
ii. Sign and Unsigned: Signed and
unsigned modifier are used to modify the sign of primitive’s data types.
Sign and Unsigned are used to restrict
the size whether only +ve value can be able to store or both +ve and – ve value
can be stored in a specific type of memory location.
¬ What is Implicit type conversion and
explicit type conversion? Explain with example.
Implicit type conversion is done
automatically by the compiler itself without any user intention. The data type
of all operand are automatically converted into datatype operand with the
largest data type.
|
Example: #include
<stdio.h> Int
main() { int
a=5; float
b= 2.5, c; c=a+b;
/* here, float is the largest type, so a is
implicitly converted to a float */ printf(“c
=%f”,c); return0; } |
Explicit type conversion is done
explicitly by the user by prefixing the operand or expression with the data
type to be converted. It is also called type casting.
Syntax: (data type) expression or
operand.
|
Example: #include
<stdio.h> Int
main() { int
a=5, b= 8, c= 9; float
avg; avg
=(float) (a+b+c)/ 3; /* here, the value of expression, (a+b+c)/3 is
explicitly converted to float t match the avg data type */ printf(“average=%f”,avg); return0; } |
¬ What is an identifier?
Identifiers are a sequence of
characters which help us to identify specific parts of a program. It is a name
given to a program elements like variable, constant, function and user-define
data by the programmers
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