Question: 16 -

Which object will be created first?

class student 
{  
    int marks;
};
student s1, s2, s3;

s3 then s2 then s1

 s1 then s2 then s3

all are created at same time

s2 then s3 then s1

Answer:

 s1 then s2 then s3

Solution:

The objects are created in the sequence of how they are written. This happens because the constructors are called in the sequence of how the objects are mentioned. This is done in sequence.

Question: 17 -

Which among the following helps to create a temporary instance?

Implicit call to a parameterized constructor

Implicit call to a default constructor

Explicit call to a copy constructor

Explicit call to a constructor

Answer:

Explicit call to a constructor

Solution:

Explicit call to a constructor can let you create a temporary instance. This is because the temporary instances doesn’t have any name. Those are deleted from memory as soon as their reference is removed.

Question: 18 -

Which of the following statement is correct about the program given below?

#include<iostream.h> 
class MasterQuiz
{
    public:
    MasterQuiz()
    {
        cout<< "Master";
    }
    ~MasterQuiz()
    {
        cout<< "Quiz";
    }
};
int main()
{
    MasterQuiz objQuiz;
    return 0; 
}

The program will print the output MasterQuiz.

The program will print the output Master.

The program will report compile time error.

The program will print the output Quiz.

Answer:

The program will print the output MasterQuiz.

Solution not available.

Question: 19 -

For constructor overloading, each constructor must differ in ___________ and __________

Return type and definition

Return type and type of arguments

Number of arguments and type of arguments

Number of arguments and return type

Answer:

Number of arguments and type of arguments

Solution:

Each constructor must differ in the number of arguments it accepts and the type of arguments. This actually defines the constructor signature. This helps to remove the ambiguity and define a unique constructor as required.

Question: 20 -

 Which among the following is correct for the class defined below?

class student
{
    int marks;
    public: student(){}
    student(int x)
    { 
         marks=x; 
    }
};
main()
{
    student s1(100);
    student s2();
    student s3=100;
    return 0;
}

Only object s1 and s2 will be created

Program runs and all objects are created

Program will give compile time error

Object s3, syntax error

Answer:

Program runs and all objects are created

Solution:

It is a special case of constructor with only 1 argument. While calling a constructor with one argument, you are actually implicitly creating a conversion from the argument type to the type of class. Hence you can directly specify the value of that one argument with assignment operator.