C++ MCQs with answers Page - 115

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Q. Which of the followings is/are automatically added to every class, if we do not write our own?

(A) Copy Constructor
(B) Assignment Operator
(C) A constructor without any parameter
(D) All of the above

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Q. Constructors have _____ return type.

(A) void
(B) char
(C) int
(D) no

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Q. Implicit return type of a class constructor is:

(A) not of class type itself
(B) class type itself
(C) a destructor of class type
(D) a destructor not of class type

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Q. Which of the following is true about constructors?
1) They cannot be virtual.
2) They cannot be private.
3) They are automatically called by new operator.

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

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Q. Output of following program?
#include<iostream>
using namespace std;
class Point {
Point() { cout << "Constructor called"; }
}; int main()
{
Point t1;
return 0;
}

(A) Compiler Error
(B) Runtime Error
(C) Constructor called
(D) None of the above

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Q. #include<iostream>
using namespace std;
class Point {
public:
Point() { cout << "Constructor called"; }
};
int main()
{
Point t1, *t2;
return 0;
}

(A) Compiler Error
(B) Constructor called Constructor called
(C) Constructor called
(D) None of the above

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Q. Which operator is having the highest precedence?

(A) postfix
(B) unary
(C) shift
(D) equality

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Q. Which of the following is FALSE about references in C++?

(A) References cannot be NULL
(B) A reference must be initialized when declared
(C) Once a reference is created, it cannot be later made to reference another object; it cannot be reset.
(D) References cannot refer to constant value

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Q. Which of the following functions must use reference?

(A) Assignment operator function
(B) Copy Constructor
(C) Destructor
(D) Parameterized constructor

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Q. Output of following C++ program?
#include<iostream>
using namespace std;
int main()
{
int x = 10;
int& ref = x;
ref = 20;
cout << "x = " << x << endl ;
x = 30;
cout << "ref = " << ref << endl;
return 0;
}

(A) x = 20; ref = 30
(B) x = 20; ref = 20
(C) x = 10; ref = 30
(D) x = 30; ref = 30

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C++ MCQs with answers Page - 115

Q. Which of the followings is/are automatically added to every class, if we do not write our own?

Q. Constructors have _____ return type.

Q. Implicit return type of a class constructor is:

Q. Which of the following is true about constructors? 1) They cannot be virtual. 2) They cannot be private. 3) They are automatically called by new operator.

Q. Output of following program? #include<iostream> using namespace std; class Point { Point() { cout << "Constructor called"; } }; int main() { Point t1; return 0; }

Q. #include<iostream> using namespace std; class Point { public: Point() { cout << "Constructor called"; } }; int main() { Point t1, *t2; return 0; }

Q. Which operator is having the highest precedence?

Q. Which of the following is FALSE about references in C++?

Q. Which of the following functions must use reference?

Q. Output of following C++ program? #include<iostream> using namespace std; int main() { int x = 10; int& ref = x; ref = 20; cout << "x = " << x << endl ; x = 30; cout << "ref = " << ref << endl; return 0; }

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Q. Which of the following is true about constructors?
1) They cannot be virtual.
2) They cannot be private.
3) They are automatically called by new operator.

Q. Output of following program?
#include<iostream>
using namespace std;
class Point {
Point() { cout << "Constructor called"; }
}; int main()
{
Point t1;
return 0;
}

Q. #include<iostream>
using namespace std;
class Point {
public:
Point() { cout << "Constructor called"; }
};
int main()
{
Point t1, *t2;
return 0;
}

Q. Output of following C++ program?
#include<iostream>
using namespace std;
int main()
{
int x = 10;
int& ref = x;
ref = 20;
cout << "x = " << x << endl ;
x = 30;
cout << "ref = " << ref << endl;
return 0;
}