C# Programming Questions and Answers

131

Consider a class maths and we had a property called as sum.b is a reference to a maths object and we want the statement b.sum = 10 to fail.Which of the follwing is the correct
solution to ensure this functionality?

a

Declare sum property with both get and set accessors

b

Declare sum property with both get and set accessors

c

Declare sum property with get, set and normal accessors

d

None of the mentioned

correct answer c

Answer: Option (C)

132

Select the correct statement about properties of read and write in C#.NET?

a

A property can simultaneously be read or write only

b

A property can be either read only or write only

c

A write only property will only have get accessor

d

A read only property will only have get accessor

correct answer b,d

Answer: Option (B) and (D)

133

Select output for the following set of code:

class sample

{

publicint i;

publicint[] arr =newint[10];

publicvoid fun(int i, int val)

{

arr[i]= val;

}

class Program

{

staticvoid Main(string[] args)

{

sample s =new sample();

s.i=10;

sample.fun(1, 5);

s.fun(1, 5);

Console.ReadLine();

}

a

sample.fun(1, 5) will not work correctly

b

s.i = 10 cannot work as i is ‘public’

c

sample.fun(1, 5) will set value as 5 in arr[1] d) s.fun(1, 5) will work correctly

d

None of the mentioned

correct answer a

An Object reference is required for non static field,method or property.
i.e sample s = new sample();
s.i = 10;
sample.fun(1, 5);
sample.fun(1, 5);
Console.ReadLine();

134

The output of code is ?

class test

{

publicvoid print()

{

Console.WriteLine("Csharp:");

}

class Program

{

staticvoid Main(string[] args)

{

test t;

t.print();

Console.ReadLine();

}

a

Code runs successfully prints nothing

b

Code runs and prints “Csharp”

c

Syntax error as t is unassigned variable which is never used

d

None of above mentioned

correct answer c

object of class test should be declared as test t = new test();
test t = new test();
t.print();
Console.ReadLine();

135

The operator used to access member function of a class?

a

:

b

::

c

.

d

#

correct answer c

objectname.function name(actual arguments);

136

Select the output for the following set of code :

class sample

{

publicint i;

publicint j;

publicvoid fun(int i, int j)

{

this.i= i;

this.j= j;

}

class Program

{

staticvoid Main(string[] args)

{

sample s =new sample();

s.i=1;

s.j=2;

s.fun(s.i, s.j);

Console.WriteLine(s.i+" "+ s.j);

Console.ReadLine();

}

a

Error while calling s.fun() due to inaccessible level

b

Error as ‘this’ reference would not be able to call ‘i’ and ‘j’

c

1 2

d

Runs successfully but prints nothing

correct answer c

Variable ‘i’ and ‘j’ declared with scope public in sample class are accessed using object of class ‘sample’ which is ‘s’.
Output:1 2.

137

What will be the output of the following snippet of code?

class number

{

int length =50;

publicint number1

{

get

{

return length;

}

set

{

length =value;

}

class Program

{

publicstaticvoid Main(string[] args)

{

number p =new number();

p.number1= p.number1+40;

int k = p.number1*3/9;

Console.WriteLine(k);

Console.ReadLine();

}

a

0

b

180

c

30

d

Compile time error

correct answer c

Answer: Option (C)

138

Choose the correct statement among the following?

a

A property can be a static member whereas an indexer is always an instance member

b

A get accessor of a property corresponds to a method with no parameters whereas get accessor of an indexer corresponds to a method with the same formal parameters lists as the indexer

c

It is an error for indexer to declare a local variable with the same name as indexer parameters

d

All of the mentioned

correct answer d

Answer: Option (D)

139

Choose the keyword which declares the indexer?

a

base

b

this

c

super

d

extract

correct answer b

The indexer is declared using the name this.

140

Choose the operator/operators which is/are used to access the [] operator in indexers?

a

get

b

set

c

access

d

All of the mentioned

correct answer a,b

The indexer is implemented through the get and set accessors for the [] operator as:
public double this[int idx] {
get
{
if()
{
}
else
{
return([idx]);
}

}
set
{
array[idx];

}
}