Questions and answers for exam Preparation

MCQs

Total Questions : 10

Question 1.

Which operations don't throw anything?

Operations which are reversible.
Operations which are irreversible.
Operations which are static.
Operations which are dynamic.

Discuss Question

Answer: Option B. -> Operations which are irreversible.

None.

Question 2.

What do you mean by "No exception specification"?

It throws nothing
It can throw anything
It can catch anything
none of the mentioned

Discuss Question

Answer: Option B. -> It can throw anything

None.

Question 3.

What is the output of this program?

1.
#include
2.
using namespace std;
3.
int main()
4.
{
5.
char* ptr;
6.
unsigned long int Test = sizeof(size_t(0) / 3);
7.
cout

4
2
bad_alloc
depends on compiler

Discuss Question

Answer: Option D. -> depends on compiler

The size of unsigned long int always depends on compiler.
Output:
$ g++ exs4.cpp
$ a.out
4

Question 4.

What is the output of this program?

1.
#include
2.
#include
3.
using namespace std;
4.
class Myshape
5.
{
6.
public:
7.
virtual void myvirtualfunc() const {}
8.
};
9.
class mytriangle: public Myshape
10.
{
11.
public:
12.
virtual void myvirtualfunc() const
13.
{
14.
};
15.
};
16.
int main()
17.
{
18.
Myshape Myshape_instance;
19.
Myshape &ref_Myshape = Myshape_instance;
20.
try
21.
{
22.
mytriangle &ref_mytriangle = dynamic_cast(ref_Myshape);
23.
}
24.
catch (bad_cast)
25.
{
26.
cout << "Can't do the dynamic_cast lor!!!" << endl;
27.
cout << "Caught: bad_cast exception. Myshape is not mytriangle.n";
28.
}
29.
return 0;
30.
}

Can't do the dynamic_cast lor!!!
Caught: bad_cast exception. Myshape is not mytriangle.
both a & b
none of the mentioned

Discuss Question

Answer: Option C. -> both a & b

As we can't able to create the dynamic instance for the triangle, So it is arising an exception.
Output:
$ g++ exs3.cpp
$ a.out
Can't do the dynamic_cast lor!!!
Caught: bad_cast exception. Myshape is not mytriangle.

Question 5.

What is the output of this program?

1.
#include
2.
#include
3.
#include
4.
using namespace std;
5.
int main( )
6.
{
7.
try
8.
{
9.
string strg1("Test");
10.
string strg2("ing");
11.
strg1.append(strg2, 4, 2);
12.
cout

out of range
bad type_id
bad allocation
none of the mentioned

Discuss Question

Answer: Option A. -> out of range

As we are using out of bound value on strings, So it arising an exception.
Output:
$ g++ exs2.cpp
$ a.out
Caught: basic_string::append
Type: St12out_of_range
#include

Question 6.

What is the output of this program?

1.
#include
2.
#include
3.
#include
4.
using namespace std;
5.
class Test1
6.
{
7.
virtual int Funct()
8.
{
9.
}
10.
};
11.
int main ()
12.
{
13.
try
14.
{
15.
Test1 * var = NULL;
16.
typeid (*var);
17.
}
18.
catch (std::exception& typevar)
19.
{
20.
cout

NULL
Exception:bad_alloc
Exception:std:bad_typeid
none of the mentioned

Discuss Question

Answer: Option C. -> Exception:std:bad_typeid

As we are using a bad type on pointers, So it is arising an error.
Output:
$ g++ exs1.cpp
$ a.out
Exception:std:bad_typeid