C++ MCQs with answers Page - 118

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Q. Output of the program?
#include<iostream>
using namespace std;
int fun(int x = 0, int y = 0, int z)
{ return (x + y + z); }
int main()
{
cout << fun(10);
return 0;
}

(A) 10
(B) 0
(C) 20
(D) Compiler Error

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Q. Output of following program?
#include <iostream>
using namespace std;
int fun(int=0, int = 0);
int main()
{
cout << fun(5);
return 0;
}
int fun(int x, int y)
{
return (x+y);
}

(A) Compiler Error
(B) 5
(C) 0
(D) 10

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Q. Which of the following is true?

(A) Static methods cannot be overloaded.
(B) Static data members can only be accessed by static methods.
(C) Non-static data members can be accessed by static methods.
(D) Static methods can only access static members (data and methods)

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Q. If a function is friend of a class, which one of the following is wrong?

(A) A function can only be declared a friend by a class itself.
(B) Friend functions are not members of a class, they are associated with it.
(C) Friend functions are members of a class.
(D) It can have access to all members of the class, even private ones.

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Q. In C++, const qualifier can be applied to
1) Member functions of a class
2) Function arguments
3) To a class data member which is declared as static
4) Reference variables

(A) Only 1, 2 and 3
(B) Only 1, 2 and 4
(C) All
(D) Only 1, 3 and 4

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Q. How to create a dynamic array of pointers (to integers) of size 10 using new in C++? Hint: We can create a non-dynamic array using int *arr[10]

(A) int *arr = new int *[10];
(B) int **arr = new int *[10];
(C) int *arr = new int [10];
(D) Not Possible

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Q. Which of the following is true about new when compared with malloc:
1) new is an operator, malloc is a function
2) new calls constructor, malloc doesn’t
3) new returns appropriate pointer, malloc returns void * and pointer needs to typecast to appropriate type.

(A) 1 and 3
(B) 2 and 3
(C) 1 and 2
(D) All 1, 2 and 3

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Q. Predict the output?
#include <iostream>
using namespace std;
class Test
{
int x;
Test()
{
x = 5;
} };
int main()
{
Test *t = new Test;
cout << t->x;
}

(A) Compiler Error
(B) 5
(C) Garbage Value
(D) 0

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Q. Is it fine to call delete twice for a pointer?
#include<iostream>
using namespace std;
int main()
{
int *ptr = new int;
delete ptr;
delete ptr;
return 0;
}

(A) Yes
(B) No
(C) none
(D) all

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Q. When the inheritance is private, the private methods in base class are __________ in the derived class (in C++).

(A) inaccessible
(B) accessible
(C) protected
(D) public

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C++ MCQs with answers Page - 118

Q. Output of the program? #include<iostream> using namespace std; int fun(int x = 0, int y = 0, int z) { return (x + y + z); } int main() { cout << fun(10); return 0; }

Q. Output of following program? #include <iostream> using namespace std; int fun(int=0, int = 0); int main() { cout << fun(5); return 0; } int fun(int x, int y) { return (x+y); }

Q. Which of the following is true?

Q. If a function is friend of a class, which one of the following is wrong?

Q. In C++, const qualifier can be applied to 1) Member functions of a class 2) Function arguments 3) To a class data member which is declared as static 4) Reference variables

Q. How to create a dynamic array of pointers (to integers) of size 10 using new in C++? Hint: We can create a non-dynamic array using int *arr[10]

Q. Which of the following is true about new when compared with malloc: 1) new is an operator, malloc is a function 2) new calls constructor, malloc doesn’t 3) new returns appropriate pointer, malloc returns void * and pointer needs to typecast to appropriate type.

Q. Predict the output? #include <iostream> using namespace std; class Test { int x; Test() { x = 5; } }; int main() { Test *t = new Test; cout << t->x; }

Q. Is it fine to call delete twice for a pointer? #include<iostream> using namespace std; int main() { int *ptr = new int; delete ptr; delete ptr; return 0; }

Q. When the inheritance is private, the private methods in base class are __________ in the derived class (in C++).

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Q. Output of the program?
#include<iostream>
using namespace std;
int fun(int x = 0, int y = 0, int z)
{ return (x + y + z); }
int main()
{
cout << fun(10);
return 0;
}

Q. Output of following program?
#include <iostream>
using namespace std;
int fun(int=0, int = 0);
int main()
{
cout << fun(5);
return 0;
}
int fun(int x, int y)
{
return (x+y);
}

Q. In C++, const qualifier can be applied to
1) Member functions of a class
2) Function arguments
3) To a class data member which is declared as static
4) Reference variables

Q. Which of the following is true about new when compared with malloc:
1) new is an operator, malloc is a function
2) new calls constructor, malloc doesn’t
3) new returns appropriate pointer, malloc returns void * and pointer needs to typecast to appropriate type.

Q. Predict the output?
#include <iostream>
using namespace std;
class Test
{
int x;
Test()
{
x = 5;
} };
int main()
{
Test *t = new Test;
cout << t->x;
}

Q. Is it fine to call delete twice for a pointer?
#include<iostream>
using namespace std;
int main()
{
int *ptr = new int;
delete ptr;
delete ptr;
return 0;
}