Questions and answers for exam Preparation

MCQs

Total Questions : 10

Question 1.

Which exception is thrown by dynamic_cast?

bad_cast
bad_typeid
bad_exception
bad_alloc

Discuss Question

Answer: Option A. -> bad_cast

bad_cast exception is thrown by dynamic_cast.

Question 2.

How do define the user-defined exceptions?

inheriting and overriding exception class functionality.
overriding class functioality.
inheriting class functionality
none of the mentioned

Discuss Question

Answer: Option A. -> inheriting and overriding exception class functionality.

None.

Question 3.

What is the output of this program?

1.
#include
2.
#include
3.
using namespace std;
4.
struct MyException : public exception
5.
{
6.
const char * what () const throw ()
7.
{
8.
return "C++ Exception";
9.
}
10.
};
11.
int main()
12.
{
13.
try
14.
{
15.
throw MyException();
16.
}
17.
catch(MyException& e)
18.
{
19.
cout

C++ Exception
Exception caught
Exception caught C++ Exception
error

Discuss Question

Answer: Option C. -> Exception caught C++ Exception

We are defining the user-defined exception in this program.
Output:
$ g++ excep4.cpp
$ a.out
C++ Exception
Exception caught

Question 4.

What is the output of this program?

1.
#include
2.
#include
3.
using namespace std;
4.
int main ()
5.
{
6.
try
7.
{
8.
int* myarray = new int[1000];
9.
cout

allocated
Standard exception
Depends on the memory
error

Discuss Question

Answer: Option C. -> Depends on the memory

In this program, We are allocating the memory for array. If it is allocated means, no exception

will arise and if there is no size in memory means, Exception will arise.
Output:
$ g++ excep3.cpp
$ a.out
allocated

Question 5.

What is the output of this program?

1.
#include
2.
#include
3.
using namespace std;
4.
class myexception: public exception
5.
{
6.
virtual const char* what() const throw()
7.
{
8.
return "My exception";
9.
}
10.
} myex;
11.
int main ()
12.
{
13.
try
14.
{
15.
throw myex;
16.
}
17.
catch (exception& e)
18.
{
19.
cout

exception
error
My exception
runtime error

Discuss Question

Answer: Option C. -> My exception

This is a standard exception handler used in the class.
Output:
$ g++ excep2.cpp
$ a.out
My exception

Question 6.

What is the output of this program?

1.
#include
2.
using namespace std;
3.
int main ()
4.
{
5.
try
6.
{
7.
throw 20;
8.
}
9.
catch (int e)
10.
{
11.
cout

20
An exception occurred
error
An exception occurred 20

Discuss Question

Answer: Option D. -> An exception occurred 20

We are handling the exception by throwing that number. So the output is printed with the given number.
Output:
$ g++ excep1.cpp
$ a.out
An exception occurred 20

Question 7.

What is the output of this program?

1.
#include
2.
using namespace std;
3.
double division(int a, int b)
4.
{
5.
if (b == 0)
6.
{
7.
throw "Division by zero condition!";
8.
}
9.
return (a / b);
10.
}
11.
int main ()
12.
{
13.
int x = 50;
14.
int y = 0;
15.
double z = 0;
16.
try
17.
{
18.
z = division(x, y);
19.
cout