Questions and answers for exam Preparation

MCQs

Total Questions : 10

Question 1.

Pick out the correct syntax of operator conversion.

operator float()const
operator float()const
operator const
None of the mentioned

Discuss Question

Answer: Option A. -> operator float()const

None.

Question 2.

How types are there in user defined conversion?

Discuss Question

Answer: Option B. -> 2

There are two types of user-defined conversions.They are conversion by constructor,

Conversion functions.

Question 3.

What is the output of this program?

1.
#include
2.
using namespace std;
3.
int main()
4.
{
5.
double a = 21.09399;
6.
float b = 10.20;
7.
int c ;
8.
c = (int) a;
9.
cout

2110
1210
21
None of the mentioned

Discuss Question

Answer: Option A. -> 2110

In this program, we casted the data type to integer.
Output:
$ g++ con5.cpp
$ a.out
2110

Question 4.

What is the output of this program?

1.
#include
2.
#include
3.
using namespace std;
4.
class test
5.
{
6.
public:
7.
operator string ()
8.
{
9.
return "Converted";
10.
}
11.
};
12.
int main()
13.
{
14.
test t;
15.
string s = t;
16.
cout

converted
error
run time error
None of the mentioned

Discuss Question

Answer: Option A. -> converted

In this program, We casted the string to the object of the class.
Output:
$ g++ con4.cppp
$ a.out
converted

Question 5.

What is the output of this program?

1.
#include
2.
#include
3.
using namespace std;
4.
class Complex
5.
{
6.
private:
7.
double real;
8.
double imag;
9.
public:
10.
Complex(double r = 0.0, double i = 0.0) : real(r), imag(i)
11.
{}
12.
double mag()
13.
{
14.
return getMag();
15.
}
16.
operator double ()
17.
{
18.
return getMag();
19.
}
20.
private:
21.
double getMag()
22.
{
23.
return sqrt(real * real + imag * imag);
24.
}
25.
};
26.
int main()
27.
{
28.
Complex com(3.0, 4.0);
29.
cout

5 5
4 5
6 6
None of the mentioned

Discuss Question

Answer: Option A. -> 5 5

In this program, we are calculating the magnitude value by two ways.
Output:
$ g++ con3.cpp
$ a.out
55

Question 6.

What is the output of this program?

1.
#include
2.
using namespace std;
3.
class sample
4.
{
5.
public:
6.
sample(int i) : m_i(i) { }
7.
public:
8.
int operator()(int i = 0) const
9.
{
10.
return m_i + i;
11.
}
12.
operator int () const
13.
{
14.
return m_i;
15.
}
16.
private:
17.
int m_i;
18.
friend int g(const sample&);
19.
};
20.
int f(char c)
21.
{
22.
return c;
23.
}
24.
int main()
25.
{
26.
sample f(2);
27.
cout

3
4
5
None of the mentioned

Discuss Question

Answer: Option B. -> 4

In this program, we are adding its value with it itself, So only we got the output as 4.
Output:
$ g++ con1.cpp
$ a.out
4

Question 7.

How many parameters does a conversion operator may take?

0
1
2
as many as possible

Discuss Question

Answer: Option A. -> 0

None.

Question 8.

What is the output of this program?

1.
#include
2.
using namespace std;
3.
class sample1
4.
{
5.
float i, j;
6.
};
7.
class sample2
8.
{
9.
int x, y;
10.
public:
11.
sample2 (int a, int b)
12.
{
13.
x = a;
14.
y = b;
15.
}
16.
int result()
17.
{
18.
return x + y;
19.
}
20.
};
21.
int main ()
22.
{
23.
sample1 d;
24.
sample2 * padd;
25.
padd = (sample2*) &d;
26.
cout 27.
return 0;
28.
}