C++ Online Quiz

Following quiz provides Multiple Choice Questions (MCQs) related to C++ Framework. You will have to read all the given answers and click over the correct answer. If you are not sure about the answer then you can check the answer using Show Answer button. You can use Next Quiz button to check new set of questions in the quiz.

Q 1 - The default access specifer for the class members is

A - public

B - private

C - protected

D - None of the above.

Answer : B

Explaination

If a member/s appear in the class with following no access specifier, the default is private.

Q 2 - Choose the respective delete operator usage for the expression ptr=new int[100].

Answer : C

Explaination

Q 3 - In the following program f() is overloaded.

void f(int x) {

}

void f(signed x) {

}

main() {

}

A - True

B - False

Answer : B

Explaination

No, as both the functions signature is same.

Q 4 - What is the output of the following program?

#include<iostream>

using namespace std;
class Base {
public: 
   virtual void f() { 
      cout<<"Base\n";
   }
};

class Derived:public Base {
public: 
   void f() { 
      cout<<"Derived\n";
   }
};

main() { 
   Base *p = new Derived();
   p->f();

}

A - Base

B - Derived

C - Compile error

D - None of the above.

Answer : B

Explaination

The overridden method f() of the created object for derived class gets called.

#include<iostream>

using namespace std;
class Base {
public: 
   virtual void f() { 
      cout<<"Base\n";
   }
};

class Derived:public Base {
public: 
   void f() { 
      cout<<"Derived\n";
   }
};

main() { 
   Base *p = new Derived();
   p->f();

}

Q 5 - Which operator is used to resolve the scope of the global variable?

Answer : D

Explaination

Scope resolution operator is used to resolve for the global scope of a variable if the local and global variables conflict by name.

Q 6 - An array can be passed to the function with call by value mechanism.

A - True

B - False

Answer : B

Explaination

An array never is passed with call by value mechanism

Q 7 - What is the output of the following program?

#include<iostream>

using namespace std;
main() {
   short unsigned int i = 0; 
   
   cout<<i--;
}

Answer : A

Explaination

0, with post decrement operator value of the variable will be considered as the expressions value and later gets decremented

#include<iostream>

using namespace std;
main() {
   short unsigned int i = 0; 
   
   cout<<i--;
}

Q 8 - What is the output of the following program?

#include<iostream>

using namespace std;
main() { 
   float t = 2;
	
	switch(t) {
      case 2: cout<<Hi;
		default: cout<<"Hello";
	}
}

Answer : D

Explaination

Error, switch expression cant be float value

#include<iostream>

using namespace std;
main() { 
   float t = 2;
	
	switch(t) {
		case 2: cout<<Hi;
		default: cout<<"Hello";
	}
}

Q 9 - What is the output of the following program?

#include<iostream>

using namespace std;
void f() {
	static int i = 3;
   
	cout<<i;
	if(--i) f();
}
main() {
	f();
}

Answer : B

Explaination

As the static variable retains its value from the function calls, the recursion happens thrice.

#include<iostream>

using namespace std;
void f() {
	static int i = 3;
   
	cout<<i;
	if(--i) f();
}
main() {
	f();
}

Q 10 - i) Exceptions can be traced and controlled using conditional statements.

ii) For critical exceptions compiler provides the handler

A - Only (i) is true

B - Only (ii) is true

C - Both (i) & (ii) are true

D - Both (i) && (ii) are false

Answer : B

Explaination

Conditional statements are used to take alternate actions depending upon certain condition but not multi branching. C++ too provides some critical exception handlers.

cpp_questions_answers.htm