Questions and answers for exam Preparation

MCQs

Total Questions : 9

Question 1.

What is the output of this program?

1.
#include
2.
using namespace std;
3.
ostream & operator

5
6
error
runtime error

Discuss Question

Answer: Option C. -> error

In this program, there will arise an ambiguous overload for 5.

Question 2.

Operator overloading is

making c++ operator works with objects
giving new meaning to existing operator
making new operator
both a & b

Discuss Question

Answer: Option D. -> both a & b

Operator overloading is the way adding operation to the existing operators.

Question 3.

What is the output of this program?

1.
#include
2.
using namespace std;
3.
class myclass
4.
{
5.
public:
6.
int i;
7.
myclass *operator->()
8.
{return this;}
9.
};
10.
int main()
11.
{
12.
myclass ob;
13.
ob->i = 10;
14.
cout

10 10
11 11
error
runtime error

Discuss Question

Answer: Option A. -> 10 10

In this program, -> operator is used to describe the member of the class and so we are getting this output.
Output:
$ g++ char4.cpp
$ a.out
10 10

Question 4.

Which of the following statements is NOT valid about operator overloading?

Only existing operators can be overloaded.
Overloaded operator must have at least one operand of its class type.
The overloaded operators follow the syntax rules of the original operator.
None of the mentioned

Discuss Question

Answer: Option D. -> None of the mentioned

None.

Question 5.

1.
#include
2.
using namespace std;
3.
class Integer
4.
{
5.
int i;
.
public:
7.
Integer(int ii) : i(ii) {}
8.
const Integer
9.
operator+(const Integer& rv) const
10.
{
11.
cout

10 10
11 11
error
runtime error

Discuss Question

Answer: Option A. -> 10 10

Answer: (a)
Explanation:We are using two operator functions and executing them and result is printed according to the order.
Output:
$ g++ oper2.cpp
$ a.out
operator+
operator+=

Question 6.

What is the output of this program?

1.
#include
2.
using namespace std;
3.
class sample
4.
{
5.
public:
6.
int x, y;
7.
sample() {};
8.
sample(int, int);
9.
sample operator + (sample);
10.
};
11.
sample::sample (int a, int b)
12.
{
13.
x = a;
14.
y = b;
15.
}
16.
sample sample::operator+ (sample param)
17.
{
18.
sample temp;
19.
temp.x = x + param.x;
20.
temp.y = y + param.y;
21.
return (temp);
22.
}
23.
int main ()
24.
{
25.
sample a (4,1);
26.
sample b (3,2);
27.
sample c;
28.
c = a + b;
29.
cout