TCS Developer Interview Questions, Process, and Tips

Code to transpose a matrix

• Iterate through rows and columns of the matrix

• Swap the elements at (i,j) and (j,i) positions

• Return the transposed matrix

Code to find the difference between two dates.

• Use a date library like moment.js or date-fns

• Subtract the earlier date from the later date to get the difference

• Convert the difference to the desired format (days, hours, etc.)

Composition is a strong relationship where the child object cannot exist without the parent object. Aggregation is a weak relationship where the child object can exist independently.

• Composition is a 'has-a' relationship, where the parent object owns the child object.

• Aggregation is a 'has-a' relationship, where the child object is a part of the parent object.

• In composition, the child object's lifetime is managed by the ...read more

Functions return a value while stored procedures do not.

• Functions can be used in SQL statements while stored procedures cannot.

• Functions can be called from within stored procedures.

• Functions can be used in views while stored procedures cannot.

• Functions can have input parameters while stored procedures can have both input and output parameters.

A unique key is a field or combination of fields in a database table that uniquely identifies each record.

• A unique key ensures that no two records in a table have the same values for the specified field(s).

• It can be a single field or a combination of fields.

• It is used to enforce data integrity and prevent duplicate records.

• Examples include primary keys, candidate keys, and alternate keys.

There are four types of joining in SQL: Inner Join, Left Join, Right Join, and Full Join.

• Inner Join returns only the matching rows from both tables.

• Left Join returns all the rows from the left table and matching rows from the right table.

• Right Join returns all the rows from the right table and matching rows from the left table.

• Full Join returns all the rows from both tables, with NULL values in the columns where there ...read more

A constraint is a limitation or restriction on something.

• Constraints can be applied in various fields such as software development, engineering, and project management.

• In software development, constraints can include limitations on memory usage, processing speed, and storage capacity.

• In engineering, constraints can include limitations on materials, dimensions, and weight.

• In project management, constraints can include l...read more

ASP.NET life cycle is the series of events that occur during the processing of a request.

• ASP.NET life cycle includes stages like initialization, page rendering, and disposal.

• During initialization, the page and its controls are created and initialized.

• During page rendering, the page is processed and HTML is generated.

• During disposal, resources used by the page are released.

• Events like Page_Load and Page_PreRender occur ...read more

View state is a hidden state of the page that stores values of controls and other page-specific data.

• View state is used to maintain the state of server-side controls between postbacks.

• It is stored in a hidden field on the page and is encrypted for security purposes.

• View state can be disabled to improve performance, but this may cause issues with control state.

• Example: A user fills out a form, but then navigates away fr...read more

Session is a way to store and retrieve user data between HTTP requests.

• Session is a temporary storage of user data on the server side.

• It is identified by a unique session ID which is stored in a cookie or URL parameter.

• Session data can be used to maintain user state, such as login status or shopping cart contents.

response.redirect is a method used in web development to redirect the user to a different URL.

• response.redirect is used to redirect the user to a different URL

• It is commonly used in web applications to redirect users after a successful login or when accessing restricted pages

• The method can be used with different programming languages and frameworks, such as ASP.NET, PHP, and Node.js

• The redirected URL can be specified a

A query string is a part of a URL that contains data to be passed to a web server.

• It starts with a question mark (?) and is followed by key-value pairs separated by ampersands (&).

• It is commonly used to filter or sort data on a web page.

• Example: www.example.com/search?q=apple&category=fruit

• To use it, simply append the query string to the end of the URL.

Polymorphism is the ability of an object to take on many forms.

• Polymorphism allows objects of different classes to be treated as if they were objects of the same class.

• It is achieved through method overriding and method overloading.

• Example: A parent class Animal can have child classes like Dog, Cat, and Bird. Each child class can have its own implementation of the method 'makeSound'.

• Polymorphism makes code more flexibl

The 4 pillars of C++ are Abstraction, Encapsulation, Inheritance, and Polymorphism.

• Abstraction: Hiding implementation details and showing only necessary information.

• Encapsulation: Binding data and functions together to prevent external interference.

• Inheritance: Creating new classes from existing ones, inheriting their properties and methods.

• Polymorphism: Using a single interface to represent multiple types of objects.