Answer Posted / arun

1. Yes we can make a constructor private. By implementing
this concept we can create a singleTon class.

2. Suppose we have a static method is a class that is used
to create the object of the class by using private
constructor then that member function is named as "Named
Constructor".

3. Using this named constructor concept we can create
SingleTon class as well as normal class.

Example:
class Singleton
{
public:
static Singleton* Instance();
protected:
Singleton();
Singleton(const Singleton&);
Singleton& operator= (const Singleton&);
private:
static Singleton* pinstance;
};
Singleton* Singleton::pinstance = 0;// initialize pointer
Singleton* Singleton::Instance ()
{
if (pinstance == 0) // is it the first call?
{
pinstance = new Singleton; // create sole instance
}
return pinstance; // address of sole instance
}
Singleton::Singleton()
{
//... perform necessary instance initializations
}
Singleton *p1 = Singleton::Instance();
Singleton *p2 = p1->Instance();
Singleton & ref = * Singleton::Instance();

Why interface is used?

975

---

Why do we use encapsulation in oops?

994

---

What are the advantages of polymorphism?

993

---

This program numbers the lines found in a text file. Write a program that reads text from a file and outputs each line preceded by a line number. Print the line number right-adjusted in a field of 3 spaces. Follow the line number with a colon, then one space, then the text of the line. You should get a character at a time and write code to ignore leading blanks on each line. You may assume that the lines are short enough to fit within a line on the screen. Otherwise, allow default printer or screen output behavior if the line is too long (i.e., wrap or truncate). A somewhat harder version determines the number of spaces needed in the field for the line numbers by counting lines before processing the lines of the file. This version of the program should insert a new line after the last complete word that will fit within a 72-character line.

2094

---

Why do we use polymorphism?

1032

---

What is class in oop with example?

1059

---

Write a program to reverse a string using recursive function?

2299

---

Which is not an object oriented programming language?

950

---

What is data binding in oops?

1048

---

What is super in oop?

1117

---

What is polymorphism what is it for and how is it used?

986

---

There are two base class B1,B2 and there is one class D which is derived from both classes, Explain the flow of calling constructors and destructors when an object of derived class is instantiated.

1948

---

Why is abstraction needed?

1001

---

How to handle exception in c++, For example in a functions i am assigning memory to some variables and also in next instructions in am dividing one variable also. If this functions generates a error while allocating memory to those variable and also while dividing the variable if i divide by zero then catch block how it will identify that this error has cone from perticular instruction

2091

---

write knight tour problem which is present in datastructure

2618

---