(1)
|
Classification of Constructor. Explain with Syntax.
|
(2)
|
Why
use Function Overloading? Explain with
an example.
|
(3)
|
Difference between Abstraction and Encapsulation.
|
(4)
|
Is C++ support multiple inheritance? If not, Why not support? If
yes, is there any probability to occur ambiguity? If yes, How can remove
ambiguity?
|
(5)
|
Explain Polymorphism with Syntax.
|
Learn Object Oriented Programming (OOP) in C++ / সি++ Here
C++ general knowledge questions and answers
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Name: Md. Johorul Islam
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----------------------
# CONSTRUCTOR:
------------
A class constructor is a special member function
of a class that is executed whenever we create
new objects of that class.
A constructor will have exact same name as the
class andit does not have any return type at
all, not even void.Constructors can be very useful
for setting initial values for certain member
variables.
constructor can place inside class with parameter,
without parameter ot both of them.
Syntex:
-------
class sum
{
public:
sum(int x,int y)
{
cout<
using namespace std;
class calculator
{
public:
double result = 0;
int match = 0;
void sum(int num1, int num2)
{
result = num1+num2;
output();
}
void sum(int num1, int num2, int num3)
{
result = num1+num2+num3;
output();
}
void sum(double num1, double num2)
{
result = num1+num2;
output();
}
void output()
{
match = result;
if(match == result)
{
cout<<"The result of sum ="<
using namespace std;
class Shape {
protected:
int width, height;
public:
Shape( int a = 0, int b = 0){
width = a;
height = b;
}
int area() {
cout << "Parent class area :" <
using namespace std;
class Shape {
protected:
int width, height;
public:
Shape( int x, int y){
width = x;
height = y;
}
int area() {
cout << "Area of this shape :"<< width*height <area();
shape = &tri;
shape
-
>area();
}
output:
Area of this shape :70
Area of this shape :50
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1. Classification of Constructor. Explain with Syntax.
Classification of Constructor:
1. Default,
2. Parameterized and
3. Copy Constructors.
Example:
#include
using namespace std;
class construct
{
public:
int a, b;
// Default Constructor
construct()
{
a = 10;
b = 20;
}
};
int main()
{
// Default constructor called automatically
// when the object is created
construct c;
cout << "a: "<< c.a << endl << "b: "<< c.b;
return 1;
}
2. Why use Function Overloading? Explain with an example
Function Overloading: Function overloading is a feature in C++ where two or more functions can have the same name but different parameters.
Function overloading can be considered as an example of polymorphism feature in C++.
Example:
#include
using namespace std;
class add
{
public:
void func(int a,int b)
{
cout<<"sum:"<> a;
cin>>b;
cin>>c;
p.func(a,b);
p.func(a,b,c);
return 0;
}:
3. Difference between Abstraction and Encapsulation.
4. Is C++ support multiple inheritance? If not, Why not support? If yes, is there any probability to occur ambiguity? If yes, How can remove ambiguity?
5. Explain Polymorphism with Syntax.
Polymorphism: The word polymorphism means having many forms. In simple words, polymorphism occurs when there is a hierarchy of classes and they are related by inheritance and a pointer variable in main section. We can define polymorphism as the ability of a message to be displayed in more than one form.
Example:
// pointers to base class
#include
using namespace std;
class Polygon {
protected:
int width, height;
public:
void set_values (int a, int b)
{ width=a; height=b; }
};
class Rectangle: public Polygon {
public:
int area()
{ return width*height; }
};
class Triangle: public Polygon {
public:
int area()
{ return width*height/2; }
};
int main () {
Rectangle rect;
Triangle trgl;
Polygon * ppoly1 = ▭
Polygon * ppoly2 = &trgl;
ppoly1->set_values (4,5);
ppoly2->set_values (4,5);
cout << rect.area() << '\n';
cout << trgl.area() << '\n';
return 0;
}