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Q:

Which design patterns benefit from the multiple inheritance?

A) Adapter and observer pattern B) Code pattern
C) Glue pattern D) None of these
 
Answer & Explanation Answer: A) Adapter and observer pattern

Explanation:
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Filed Under: C++

Q:

What will happen when introduce the interface of classes in a run-time polymorphic hierarchy?

A) Separation of interface from implementation B) Merging of interface from implementation
C) Separation of interface from debugging D) None of the mentioned
 
Answer & Explanation Answer: A) Separation of interface from implementation

Explanation:
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Q:

Which operator is used in catch-all handler?

A) ellipses operator B) ternary operator
C) string operator D) unary operator
 
Answer & Explanation Answer: A) ellipses operator

Explanation:

The ellipses operator can be represented as (…).

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Q:

How many ways of reusing are there in class hierarchy?

A) 1 B) 2
C) 3 D) 4
 
Answer & Explanation Answer: B) 2

Explanation:

Class hierarchies promote reuse in two ways. They are code sharing and interface sharing.

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Q:

Which is also called as abstract class?

A) virtual function B) pure virtual function
C) derived class D) None of these
 
Answer & Explanation Answer: B) pure virtual function

Explanation:

Classes that contain at least one pure virtual function are called as abstract base classes.

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Q:

Which of the following can derived class inherit?

A) members B) functions
C) both a & b D) None of the above
 
Answer & Explanation Answer: C) both a & b

Explanation:
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Q:

which keyword is used to define the macros in c++?

A) macro B) define
C) #define D) none of these
 
Answer & Explanation Answer: C) #define

Explanation:
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Q:

What is the output of this program ?

       #include
        using namespace std;
        int n(char, int);
        int (*p) (char, int) = n;
        int main()
        {
            (*p)('d', 9);
            p(10, 9);
            return 0;
        }
        int n(char c, int i)
        {
            cout << c <<  i;
            return 0;
        }

A) d99 B) d9d9
C) d9 D) compile time error
 
Answer & Explanation Answer: A) d99

Explanation:

In this program, we have declared the values as integer instead of character, So it is printing as d99 but it will not arise an error.

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Filed Under: C++