C++ Programming Multiple Choice Questions - Exception Handling
This section focuses on the "Exception Handling" in C++ programming langauge. These Multiple Choice Questions (MCQ) should be practiced to improve the C++ programming skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
1. Which keyword is used to handle the expection?
A. Try
B. Throw
C. Catch
D. None of the above
View Answer
Ans : C
Explanation: Catch keyword is used to handle the expection
2. Which is used to throw a exception?
A. Try
B. Throw
C. Catch
D. None of the above
View Answer
Ans : B
Explanation: Throw is used to throw a exception.
3. Which exception is thrown by dynamic_cast?
A. bad_cast
B. bad_typeid
C. bad_exception
D. bad_alloc
View Answer
Ans : A
Explanation: bad_cast exception is thrown by dynamic_cast.
4. How do define the user-defined exceptions?
A. Inherting & overriding exception class functionlity
B. Overriding class functionlity
C. Inherting class functionlity
D. None of the above
View Answer
Ans : A
Explanation: By using Inherting & overriding exception class functionlity
5. We can prevent a function from throwing any exceptions.
A. TRUE
B. FALSE
C. May Be
D. Can't Say
View Answer
Ans : A
Explanation: True, We can prevent a function from throwing any exceptions.
6. In nested try block, if inner catch handler gets executed, then __________?
A. Program execution stops immediately.
B. Outer catch handler will also get executed.
C. Compiler will jump to the outer catch handler and then executes remaining executable statements of main().
D. Compiler will execute remaining executable statements of outer try block and then the main().
View Answer
Ans : D
Explanation: In nested try block, if inner catch handler gets executed, then Compiler will execute remaining executable statements of outer try block and then the main().
7. Return type of uncaught_exception() is ___________.
A. int
B. bool
C. char *
D. double
View Answer
Ans : B
Explanation: Return type of uncaught_exception() is bool.
8. Which of the following statements are true about Catch handler?
i) It must be placed immediately after try block T.
ii) It can have multiple parameters.
iii) There must be only one catch handler for every try block.
iv) There can be multiple catch handler for a try block T.
v) Generic catch handler can be placed anywhere after try block.
A. Only i, iv, v
B. Only i, ii, iii
C. Only i, iv
D. Only i, ii
View Answer
Ans : C
Explanation: Only i, iv statements are true about Catch handler.
9. If inner catch handler is not able to handle the exception then__________ .
A. Compiler will look for outer try handler
B. Program terminates abnormally
C. Compiler will check for appropriate catch handler of outer try block
D. None of the above
View Answer
Ans : C
Explanation: If inner catch handler is not able to handle the exception then Compiler will check for appropriate catch handler of outer try block.
10. Which type of program is recommended to include in try block?
A. Static memory allocation
B. Dynamic memory allocation
C. Const reference
D. Pointer
View Answer
Ans : B
Explanation: While during dynamic memory allocation, Your system may not have sufficient resources to handle it, So it is better to use it inside the try block.
11. What is the output of this program?
#include <iostream>
using namespace std;
int main()
{
try
{
throw 'b';
}
catch (int param)
{
cout << "Int Exception";
}
catch (...)
{
cout << "Default Exception";
}
cout << "After Exception";
return 0;
}
A. Default Exception
After Exception
B. Int Exception After Exception
C. Int Exception
D. Default Exception
View Answer
Ans : A
Explanation: The block catch(...) is used for catch all, when a data type of a thrown exception doesn't match with any other catch block, the code inside catch(...) is executed. Note that the implicit type conversion doesn't happen when exceptions are caught. The character 'a' is not automatically converted to int.
12. What is the output of this program?
#include <iostream>
using namespace std;
int main()
{
try
{
throw 10;
}
catch (...)
{
cout << "Default Exceptionn";
}
catch (int param)
{
cout << "Int Exceptionn";
}
return 0;
}
A. Default Exception
B. Int Exception
C. Compiler Error
D. None of the above
View Answer
Ans : C
Explanation: It is compiler error to put catch all block before any other catch. The catch(...) must be the last catch block.
13. What is the output of this program?
#include <iostream>
using namespace std;
int main()
{
int P = -1;
try {
cout << "Inside try";
if (P < 0)
{
throw P;
cout << "After throw";
}
}
catch (int P ) {
cout << "Exception Caught";
}
cout << "After catch";
return 0;
}
A. Inside try
Exception Caught
After throw
After catch
B. Inside try
Exception Caught
After catch
C. Inside try
Exception Caught
D. Inside try
After throw
After catch
View Answer
Ans : B
Explanation: When an exception is thrown, lines of try block after the throw statement are not executed. When exception is caught, the code after catch block is executed. Catch blocks are generally written at the end through.
14. What is the output of this program?
#include <iostream>
using namespace std;
class Base {};
class Derived: public Base {};
int main()
{
Derived LFC;
try {
throw LFC;
}
catch(Base LFC) {
cout<<"Base Exception";
}
catch(Derived LFC) {
cout<<"Derived Exception";
}
return 0;
}
A. Derived Exception
B. Base Exception
C. Compiler Error
D. None of the above
View Answer
Ans : B
Explanation: If both base and derived classes are caught as exceptions then catch block of derived class must appear before the base class. If we put base class first then the derived class catch block will never be reached. In Java, catching a base class exception before derived is not allowed by the compiler itself. In C++, compiler might give warning about it, but compiles the code.
15. Which of the following is true about the following program
#include <iostream>
using namespace std;
int main ()
{
try
{
throw 10;
}
catch (int LFC)
{
cout << "An exception occurred " << LFC << endl;
}
return 0;
}
A. 10
B. An exception
C. Error
D. An exception occurred 10
View Answer
Ans : D
Explanation: We are handling the exception by throwing that number. So the output is printed with the given number.
16. What will be the output of this program?
#include <iostream>
using namespace std;
class myexception: public exception
{
virtual const char* what() const throw()
{
return "My exception";
}
} ex;
int main ()
{
try
{
throw ex;
}
catch (exception& LFC)
{
cout << LFC.what() << endl;
}
return 0;
}
A. Exception
B. Error
C. My exception
D. runtime error
View Answer
Ans : C
Explanation: This is a standard exception handler used in the class.
17. What will be the output of this program?
#include <iostream>
using namespace std;
int main ()
{
try
{
int* myarray = new int[1000];
cout << "Allocated";
}
catch (exception& LFC)
{
cout << "Standard exception: " << LFC.what() << endl;
}
return 0;
}
A. Allocated
B. Standard exception
C. Depends on the memory
D. Error
View Answer
Ans : A
Explanation: 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.
18. What will be the output of the following program?
#include <iostream>
using namespace std;
int main( )
{
try
{
string strg1("Test");
string strg2("ing");
strg1.append(strg2, 4, 2);
cout << strg1 << endl;
}
catch (exception &LFC)
{
cout << "Caught: " << LFC.what() << endl;
cout << "Type: " << typeid(LFC).name() << endl;
};
return 0;
}
A. out of range
B. bad type_id
C. bad allocation
D. none of the mentioned
View Answer
Ans : A
Explanation: As we are using out of bound value on strings, So it arising an exception.
Output:
19. Which illustrate predefined exceptions
A. Memory allocation error
B. I/O error
C. Both A and B
D. None of the above
View Answer
Ans : C
Explanation: Both A and B illustrate predefined exceptions.
20. What is not called terminate() function in an constructor?
A. Main
B. Class
C. Destructor
D. None of the above
View Answer
Ans : C
Explanation: Destructor is not called terminate() function in an constructor.
21. Which statement is used to catch all types of exceptions?
A. Catch()
B. Catch(Test t)
C. Catch(...)
D. None of the above
View Answer
Ans : C
Explanation: This catch statement will catch all types of exceptions that arises in the program.
22. How to handle error in the destructor?
A. Throwing
B. Terminate
C. Both throwing & terminate
D. None of the above
View Answer
Ans : B
Explanation: It will not throw an exception from the destructor but it will the process by using terminate() function.
23. What kind of exceptions are available in c++?
A. Handled
B. Unhandled
C. Static
D. Dynamic
View Answer
Ans : B
Explanation: Unhandled exceptions are available in c++
24. Which of the following is true about exception handling in C++?
i) There is a standard exception class like Exception class in Java.
ii) All exceptions are unchecked in C++, i.e., compiler doesn't check if the exceptions are caught or not.
iii) In C++, a function can specify the list of exceptions that it can throw using comma separated list like following.
A. Only i,iii
B. Only i,ii
C. Only ii,iii
D. All of the above
View Answer
Ans : B
Explanation: While during dynamic memory allocation, Your system may not have sufficient resources to handle it, So it is better to use it inside the try block.
25. What is the basic of grouping standard exception classes,in c++?
A. Catch
B. None of these
C. Error
D. Namespace std
View Answer
Ans : D
Explanation: This catch statement will catch all types of exceptions that arises in the program
26. What is a count of standard exception?
A. 9
B. 5
C. 6
D. 7
View Answer
Ans : A
Explanation: It will not throw an exception from the destructor but it will the process by using terminate() function.
27. What should be included in try block in c++ programming language?
A. Static value
B. Dynamic allocation
C. None of the above
D. Const value
View Answer
Ans : B
Explanation: Dynamic allocation should be included in try block in c++ programming language.
28. How many standard exception exist in c++?
A. 9
B. 5
C. 6
D. 7
View Answer
Ans : B
Explanation: 5 many standard exception exist in c++.
29. Catch-all handlers uses which operators in c++?
A. String operators
B. Ternary operators
C. Ellipses operators
D. Unary operators
View Answer
Ans : C
Explanation: Catch-all handlers uses Ellipses operators in c++
30. Uncaught exception will call which function?
A. Terminate
B. Catch
C. None of the above
D. Throw
View Answer
Ans : A
Explanation: Uncaught exception will call Terminate function
31. Which operator in c++ programming language , is used by catch-all handler?
A. Ellipses operator
B. Ternary operator
C. String operator
D. Unary operator
View Answer
Ans : A
Explanation: Ellipses operator in c++ programming language , is used by catch-all handler.
32. How to handle exception in constructor, in c++?
A. We have to return an exception
B. We have to throw an exception
C. Both A and B
D. None of the above
View Answer
Ans : B
Explanation: We have to throw an exception to handle exception in constructor, in c++
33. How many parameter does the throw expression has, in c++?
A. 1
B. 2
C. 3
D. 4
View Answer
Ans : A
Explanation: 1 parameter does the throw expression has, in c++.
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