C++ Programming Questions and Answers – Exception Handling – 2

This set of C++ Programming Multiple Choice Questions & Answers (MCQs) focuses on “Exception Handling – 2”.

1. Where should we place catch block of the derived class in a try-catch block?
a) Before the catch block of Base class
b) After the catch block of Base class
c) Anywhere in the sequence of catch blocks
d) After all the catch blocks
View Answer

2. What happens when this C++ program is compiled?

#include <iostream>
#include <string>
#include <cstdlib>
using namespace std;
class A
{
	int a;
    public:
	A(){}
};
 
class B: public A
{
	int b;
    public:
	B(){}
};
 
void func()
{
	B b;
	throw b;
}
 
int main()
{
	try{
		func();
	}
	catch(A a){
		cout<<"Caught A Class\n";
	}
	catch(B b){
		cout<<"Caught B Class\n";
	}
}

a) The program compiles successfully without any errors or warnings
b) Compile-time error occurs
c) The program compiles successfully with warnings
d) The program gives both errors and warnings
View Answer

$ g++ check.cpp
check.cpp: In function ‘int main()’:
check.cpp:33:2: warning: exception of type ‘B’ will be caught
  catch(B b){
  ^~~~~
check.cpp:30:2: warning:    by earlier handler for ‘A’
  catch(A a){
  ^~~~~

3. What will be the output of the following C++ code?

#include <iostream>
#include <string>
#include <cstdlib>
using namespace std;
class A
{
	int a;
    public:
	A(){}
};
 
class B: public A
{
	int b;
    public:
	B(){}
};
 
void func()
{
	B b;
	throw b;
}
 
int main()
{
	try{
		func();
	}
	catch(A a){
		cout<<"Caught A Class\n";
	}
	catch(B b){
		cout<<"Caught B Class\n";
	}
}

a) Caught B Class
b) Caught A Class
c) Compile-time error
d) Run-time error
View Answer

$ ./a.out 
Caught A Class

4. What will be the output of the following C++ code?

#include <iostream>
#include <string>
#include <cstdlib>
using namespace std;
class A
{
	int a;
   public:
	A(){}
};
 
class B: public A
{
	int b;
    public:
	B(){}
};
 
void func()
{
	B b;
	throw b;
}
 
int main()
{
	try{
		func();
	}
	catch(B b){
		cout<<"Caught B Class\n";
	}
	catch(A a){
		cout<<"Caught A Class\n";
	}
}

a) Caught B Class
b) Caught A Class
c) Compile-time error
d) Run-time error
View Answer

$ ./a.out 
Caught B Class

5. What will be the output of the following C++ code?

#include <iostream>
#include <string>
#include <cstdlib>
using namespace std;
class A
{
	int a;
    public:
	A(){}
};
class B: public A
{
	int b;
    public:
	B(){}
};
 
void func()
{
	B b;
	throw b;
}
int main()
{
	try{
		func();
	}
	catch(B *b){
		cout<<"Caught B Class\n";
	}
	catch(A a){
		cout<<"Caught A Class\n";
	}
}

a) Caught B Class
b) Caught A Class
c) Compile-time error
d) Run-time error
View Answer

6. What id the syntax for catching any type of exceptions?
a) catch(Exception e)
b) catch(…)
c) catch(Exception ALL)
d) catch(ALL)
View Answer

7. What will be the output of the following C++ code?

#include <iostream>
#include <string>
#include <cstdlib>
using namespace std;
class A
{
	int a;
    public:
	A(){}
};
 
class B: public A
{
	int b;
    public:
	B(){}
};
 
void func1()
{
	B b;
	throw b;
}
 
void func2()
{
	A a;
	throw a;
}
 
int main()
{
	try{
		func1();
	}
	catch(...){
		cout<<"Caught All types of exceptions\n";
	}
	try{
		func2();
	}
	catch(B b){
		cout<<"Caught All types of exceptions\n";
	}
}

a) Caught All types of exceptions
b)

Caught All types of exceptions
Aborted (core dumped)

c) Error
d)

Caught All types of exceptions
Caught All types of exceptions

8. Uncaught exception leads to ______________
a) termination of program
b) successful execution of programs
c) no effect on the program
d) execution of other functions of the program starts
View Answer

9. An uncaught handler returns to _______________
a) main function
b) its caller
c) its callee
d) none of the mentioned
View Answer

10. Header file used for exception handling in C++?
a) <cstdlib>
b) <string>
c) <handler>
d) <exception>
View Answer

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