How many ways of reusing are there in the class hierarchy?

1.	How many ways of reusing are there in the class hierarchy?
A.	4
B.	3
C.	2
D.	1
E.	None of these
Answer» D. 1

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What is the output of this program? <pre class="prettyprint lang-c">#include <iostream> using namespace std; class InterfaceClass { public: virtual void Display() = 0; }; class ClassA : public InterfaceClass { public: void Display() { int num = 10; cout << num; } }; class ClassB : public InterfaceClass { public: void Display() { cout < } }; int main() { ClassA object1; object1.Display(); ClassB object2; object2.Display(); return 0; } </pre>
What is the output of this program? <pre class="prettyprint lang-c">#include <iostream> using namespace std; class FirstClass { protected: int width, height; public: void set_values (int x, int y) { width = x; height = y; } virtual int area (void) = 0; }; class SecondClass: public FirstClass { public: int area (void) { return (width * height); } }; class ThirdClass: public FirstClass { public: int area (void) { return (width * height / 2); } }; int main () { SecondClass Rectangle; ThirdClass trgl; FirstClass * ppoly1 = &Rectangle; FirstClass * ppoly2 = &trgl; ppoly1->set_values (3, 6); ppoly2->set_values (3, 6); cout << ppoly1 -> area() < cout << ppoly2 -> area(); return 0; } </pre>
What is the output of this program? <pre class="prettyprint lang-c">#include <iostream> using namespace std; class Base { int K; public: void setInt(int num); int getInt(); }; class Derived : public Base { int L; public: void setL(int num); int multiply(); }; void Base::setInt(int num) { K = num; } int Base::getInt() { return K; } void Derived::setL(int num) { L = num; } int Derived::multiply() { return L * getInt(); } int main() { Derived object; object.setInt(12); object.setL(3); cout << object.multiply(); return 0; } </pre>
What is the output of this program? <pre class="prettyprint lang-c">#include <iostream> using namespace std; class BaseClass { public: virtual void Function() { cout << "4"; } }; class DerivedClassA : public BaseClass { public: void Function() { cout << " 5"; } }; class DerivedClassB : public DerivedClassA { public: void Function() { cout << " 6"; } }; int main() { BaseClass *ptr; BaseClass BaseObject; DerivedClassA derivedObjectA; DerivedClassB derivedObjectB; ptr = &BaseObject; ptr -> Function(); ptr = &derivedObjectA; ptr -> Function(); ptr = &derivedObjectB; ptr -> Function(); return 0; } </pre>
What is the output of this program? <pre class="prettyprint lang-c">#include <iostream> using namespace std; class BaseClass { int A; public: void setA(int num1) { A = num1; } void showA() { cout << A < } }; class DerivedClass : private BaseClass { int B; public: void setAB(int num1, int num2) { setA(num1); B = num2; } void showAB() { showA(); cout < } }; int main() { DerivedClass object; object.setAB(15, 25); object.showAB(); return 0; } </pre>
What is the output of this program? <pre class="prettyprint lang-c">#include <iostream> using namespace std; class BaseClass { public: BaseClass(){} ~BaseClass(){} protected: private: }; class DerivedClass:public BaseClass { public: DerivedClass(){} DerivedClass(){} private: protected: }; int main() { cout << "The program exceuted" << endl; } </pre>
What is the output of this program? <pre class="prettyprint lang-c">#include <iostream> #include <sstream> using namespace std; int main() { stringstream strstream(ios :: in | ios :: out); std :: string data("The double value is : 12.25 ."); strstream.str(data); strstream.seekg(-5, ios :: end); double value; strstream >> value; value = value*value; strstream.seekp(-5,ios::end); strstream << value; std :: string new_value = strstream.str(); cout << new_value; return 0; } </pre>
What is the output of this program? <pre class="prettyprint lang-c">#include <iostream> using namespace std; class Polygon { protected: int W, H; public: void set_values(int width, int height) { W = width; H = height; } }; class Coutput { public: void output(int i); }; void Coutput::output(int i) { cout < class Rectangle:public Polygon, public Coutput { public: int area() { return(W * H); } }; class Triangle:public Polygon, public Coutput { public: int area() { return(W * H / 2); } }; int main() { Rectangle Rect; Triangle trgl; Rect.set_values(5, 2); trgl.set_values(5, 2); Rect.output(Rect.area()); trgl.output(trgl.area()); return 0; } </pre>
What is the output of this program? <pre class="prettyprint lang-c">#include <iostream> using namespace std; class student { protected: int Rollno; public: void get_Rollno(int num) { Rollno = num; } void put_Rollno(void) { } }; class test:public student { protected: float Subject1,Subject2; public: void get_mark(float num1, float num2) { Subject1 = num1; Subject2 = num2; } void put_marks() { } }; class sports { protected: float score; public: void getscore(float s) { score = s; } void putscore(void) { } }; class result: public test, public sports { float total; public: void display(void); }; void result::display(void) { total = Subject1 + Subject2 + score; put_Rollno(); put_marks(); putscore(); cout << "Total Score = " << total << " n"; } int main() { result student; student.get_Rollno(101); student.get_mark(50.25, 42.52); student.getscore(7.0); student.display(); return 0; } </pre>
What is the output of this program? <pre class="prettyprint lang-c">#include <iostream> using namespace std; class BaseClass { public: virtual void print() const = 0; }; class DerivedClassA : virtual public BaseClass { public: void print() const { cout << " 5 "; } }; class DerivedClassB : virtual public BaseClass { public: void print() const { cout << "3"; } }; class Multiple : public DerivedClassA, DerivedClassB { public: void print() const { DerivedClassB::print(); } }; int main() { Multiple both; DerivedClassA objectA; DerivedClassB objectB; BaseClass *array[ 3 ]; array[ 0 ] = &both; array[ 1 ] = &objectA; array[ 2 ] = &objectB; for ( int K = 0; K < 3; K++ ) array[ K ] -> print(); return 0; } </pre>

How many ways of reusing are there in the class hierarchy?

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