Questions and answers for exam Preparation

MCQs

Total Questions : 10

Question 1.

Why is it expensive to use objects for exception?

Exception object is created only if an error actually happens
Because of execution time
Memory space involved in creating an exception object
None of the mentioned

Discuss Question

Answer: Option A. -> Exception object is created only if an error actually happens

If an error occurs in program, then only exception object is created otherwise, It will not be

created. So it's expensive to use in the program.

Question 2.

What is the main purpose of the constructor?

Begin the execution of the class
Include the macros for the program
Establish the class invariant
None of the mentioned

Discuss Question

Answer: Option C. -> Establish the class invariant

The purpose of a constructor is to establish the class invariant. To do that, it often needs to

acquire system resources or in general perform an operation that may fail.

Question 3.

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

50
0
Division by zero condition
Error

Discuss Question

Answer: Option D. -> Error

As we missed the data type in the catch block, It will arise an error.

Question 4.

What is the output of this program?

1.
#include
2.
#include
3.
using namespace std;
4.
int main ()
5.
{
6.
int num = 3;
7.
string str_bad = "wrong number used";
8.
try
9.
{
10.
if ( num == 1 )
11.
{
12.
throw 5;
13.
}
14.
if ( num == 2 )
15.
{
16.
throw 1.1f;
17.
}
18.
if ( num != 1 || num != 2 )
19.
{
20.
throw str_bad;
21.
}
22.
}
23.
catch (int a)
24.
{
25.
cout

Exception is 5
Exception is 1.1f
wrong number used
None of the mentioned

Discuss Question

Answer: Option C. -> wrong number used

As we are giving 3 to num, It is arising an exception named
"wrong number used".
Output:
$ g++ expef.cpp
$ a.out
wrong number used

Question 5.

What is the output of this program?

1.
#include
2.
#include
3.
#include
4.
using namespace std;
5.
void func(int c)
6.
{
7.
if (c < numeric_limits :: max())
8.
throw invalid_argument("MyFunc argument too large.");
9.
else
10.
{
11.
cout

Invalid arguments
Executed
Error
Runtime error

Discuss Question

Answer: Option B. -> Executed

As we are throwing the function and catching it with a correct data type, So this program will execute.
Output:
$ g++ expef.cpp
$ a.out
Executed

Question 6.

What is the output of this program?

1.
#include
2.
using namespace std;
3.
void test(int x)
4.
{
5.
try
6.
{
7.
if (x > 0)
8.
throw x;
9.
else
10.
throw 'x';
11.
}
12.
catch(char)
13.
{
14.
cout

Catch a integer and that integer is:10
Error
Runtime error
None of the mentioned

Discuss Question

Answer: Option C. -> Runtime error

As the catch is created with a wrong type, So it will
arise a runtime error.
Output:
$ g++ expef.cpp
$ a.out
Testing multiple catches
terminate called after throwing an instance of /int'
:Aborted