TCS iON IT fresher Interview Questions and Answers

I have knowledge of programming languages such as Java, Python, and C++. I am also familiar with web development technologies like HTML, CSS, and JavaScript.

• Proficient in Java, Python, and C++ programming languages

• Familiar with web development technologies like HTML, CSS, and JavaScript

• Knowledge of database management systems like MySQL and Oracle

• Experience with version control systems like Git

• Understanding of software development methodologies like Agile and Waterfall

I know multiple programming languages including Java, Python, and C++.

• Java - used for building enterprise-level applications

• Python - known for its simplicity and versatility

• C++ - used for system programming and game development

A null pointer is a pointer that does not point to any memory location.

• A null pointer is represented by the value 0 or NULL.

• Dereferencing a null pointer results in a segmentation fault.

• Null pointers are commonly used to indicate the end of a linked list or array.

• Null pointers can be assigned to any pointer type.

Classes in C++ are user-defined data types that encapsulate data and functions.

• Classes are used for object-oriented programming.

• They allow for data abstraction and encapsulation.

• Classes can have member variables and member functions.

• Objects are instances of classes.

• Inheritance and polymorphism are key features of classes.

A pointer is a variable that stores the memory address of another variable.

• Pointers allow direct manipulation of memory.

• They are used to access and modify data indirectly.

• Pointers are commonly used in dynamic memory allocation.

• Example: int* ptr; // declares a pointer to an integer variable.

Structures are user-defined data types that allow storing multiple data types under a single name.

• Structures are used to group related data together.

• They can contain variables of different data types.

• Structures can also contain functions.

• Structures are defined using the 'struct' keyword.

• Example: struct student { char name[20]; int age; float marks; };

• Structures can be passed as arguments to functions.

• They can also be used to create linked lists and other data structures.

A nested structure is a structure within another structure in programming.

• It allows for more complex data structures to be created

• It can be used in various programming languages such as C++, Java, and Python

• An example of a nested structure is a struct within a struct in C++