10+ Hexpress Healthcare Interview Questions and Answers

To check if a linked list has a cycle, use Floyd's Tortoise and Hare algorithm.

• Use two pointers, slow and fast, to traverse the linked list.

• If there is a cycle, the fast pointer will eventually meet the slow pointer.

• Example: 1->2->3->4->2 (cycle exists between 4 and 2)

Encapsulation, Inheritance, Polymorphism, Abstraction in one code

• Create a class with private variables and public methods to demonstrate encapsulation

• Create a subclass that inherits from a parent class to demonstrate inheritance

• Use method overloading or overriding to demonstrate polymorphism

• Use abstract classes or interfaces to demonstrate abstraction

Comparable is an interface used for natural ordering of objects, while Comparator is an interface used for custom ordering of objects.

• Comparable interface is used to define the natural ordering of objects in a class by implementing the compareTo() method.

• Comparator interface is used to define custom ordering of objects in a class by implementing the compare() method.

• Example: Comparable interface is used in classes like String, Integer for default sorting. Comparator interface...read more

Find the largest subarray sum in an array of integers

• Use Kadane's algorithm to find the maximum subarray sum

• Iterate through the array and keep track of the current sum and maximum sum

• Reset the current sum to 0 if it becomes negative

V table is a table of function pointers used in object-oriented programming, while V pointer is a pointer to the V table.

• V table is a table of function pointers used for dynamic dispatch in object-oriented programming.

• V pointer is a pointer to the V table, allowing objects to call the correct functions at runtime.

• Example: In C++ virtual functions are implemented using V tables and V pointers.

Netcracker is a leading provider of BSS, OSS, and SDN/NFV solutions for service providers around the world.

• Netcracker offers comprehensive solutions for business support systems (BSS), operations support systems (OSS), and software-defined networking (SDN) / network functions virtualization (NFV).

• Netcracker has a strong track record of working with major service providers globally, including telecommunications companies.

• Netcracker's solutions help service providers streamline...read more

Friend function is a function that is not a member of a class but has access to its private and protected members.

• Friend functions are declared inside a class with the 'friend' keyword.

• They can access private and protected members of the class.

• They are not member functions of the class.

• Example: class MyClass { private: int x; friend void myFriendFunction(MyClass obj); };

Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• Polymorphism allows for flexibility and reusability in code.

• It enables a single interface to be used for different data types or classes.

• Examples include method overriding in inheritance and method overloading within a class.

A program to swap variables

• Declare two variables and assign values to them

• Use a third variable to store the value of the first variable

• Assign the value of the second variable to the first variable

• Assign the value of the third variable to the second variable

Memory leaks occur when a program fails to release memory it no longer needs, leading to inefficient memory usage.

• Memory leaks can occur when a program dynamically allocates memory but forgets to deallocate it.

• Common causes of memory leaks include not freeing memory after use, using incorrect deallocation functions, and circular references.

• Memory leaks can lead to performance issues, crashes, and system instability.

• Tools like Valgrind can help detect memory leaks by analyzing...read more

Scope resolution refers to the process of specifying which scope a particular variable or function belongs to in a programming language.

• Scope resolution is typically denoted by the double colon (::) operator in languages like C++ and PHP.

• It is used to access static members, constants, and overridden methods in a class.

• Example: ClassName::staticMember

• Example: Namespace::functionName

Oops concepts in C Language include encapsulation, inheritance, polymorphism, and abstraction.

• Encapsulation: Bundling data and methods that operate on the data into a single unit. Example: struct in C.

• Inheritance: Allowing a class to inherit properties and behavior from another class. Example: using struct to mimic inheritance.

• Polymorphism: Ability to present the same interface for different data types. Example: function overloading in C.

• Abstraction: Hiding the complex implem...read more

File handling classes are used in programming to read, write, and manipulate files.

• File handling classes provide methods to open, read, write, and close files.

• Examples include FileInputStream, FileOutputStream, FileReader, FileWriter in Java.

• These classes help in managing file operations efficiently and securely.