Technology Interview Questions and Answers

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Last update: 12 Sep 2020, 12 Questions

We bring you a collection of the essential technology interview questions. This is best suited for college freshers and inexperienced professionals just getting into the field of technology. If you're fresher hunting for a job in the Technology Domain, you have landed on the right page!

Our list consists of the most frequently asked technology interview questions and answers, from various domains like C, C++, Java, Data Structures & Algorithms. These are the very core topics of the technology domain, which can help a fresher get an edge over others competing for the same job position. We aim to drive clarity within you by helping you understand the most critical programming world concepts, regardless of the tech stack you choose to pursue.

Most Frequently Asked Information technology interview questions

1. What is the difference between a string and an array?
Array String
This is a sequential collection of elements having the same data type. This is a sequence of characters presented as a single data type.
Elements of the array are stored in a continuous manner to optimize memory locations space. Strings can be stored in any manner.
It can store floats, integers, doubles, etc. Strings can only hold char data types.
Arrays are mutable, i.e., values can be changed later on. Strings are immutable, i.e., values cannot be changed once created.
It can be one or two dimensional. It is only two dimensional.
The length of an array once created is fixed. The length of a string can be changed later on.
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2. Is a default case necessary in a switch statement? No, it is not vital that you have a default case in a switch statement. Although, if no case in your switch is satisfied, the default case can be useful. So, if you're unsure about the outcome, it's advised that you mention a default case.
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3. Is it possible to execute code even after the program exits the main() function?

Well, in both C & C++, the functions which are registered using the at exit() function can be called after main() returns. In C++, the static destructors can be called even after the main() function has been called.

Note: Did you know that the C language was not called that since its inception. This is the evolution of the C language:

ALGO -> BCPL -> B -> Tradition C -> K&R C -> ANSI C -> ANSI/ISO C -> C99. Well, here is the list of information technology interview questions and answers to help you get a grasp on the latest trends in this field.

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4. What is the difference between ++var and var++?
++var var++
This will first increment the value of the variable then process it. It will first process the variable then increment its value.
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5. What is meant by "bit masking"?

Bit masking is the process of selecting which bits to keep and which bits to show. This is done using the AND, OR, and XOR operators, which mask the values which you want to clear and explain the benefits you want to show.

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6. What is a static function?

A static function is a function that has a scope limited to an object file. This means these functions are visible to other functions in the same file or same translation unit.


static int fun(void)
    printf("This is a static function ");

Note: A static member function can not be declared as a const, volatile, or const volatile. Download our complete list of information technology interview questions and answers to read it offline in the form of a PDF document.

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7. When is a switch statement better than multiple if statements?

The switch statement is a better option than multiple if statements when you are just giving the input directly without actually doing any condition checking in the statements.

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8. What is data structure?

A data structure is a specific format for the organization, processing, retrieving, and storage of data.

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9. What is a spanning Tree?

In the domain of Data Algorithms, a spanning tree T is basically a subgraph of an undirected graph G that is a tree that includes all of the vertices of G(the undirected graph), with the minimum possible number of edges.

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10. What are the advantages of DBMS?

Here are the advantages of having a Database Management System (DBMS):

  • Eradicating Data Redundancy by having a global database for storing all segments of data.
  • Sharing of Data among multiple users as and when required.
  • Maintaining Data Integrity, Accuracy, and Consistency throughout the database.
  • Data Security & Privacy for ensuring that the correct amount of data is visible only to any user as per authorization.
  • Automatic Backup and Recovery of Data periodically so that the manual version of the same is not required, thus saving resources and time.
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11. What is normalization?

Normalization is the process used in Databases for structuring a relational database. This is in accordance with a series of standard or default forms with the sole purpose of reducing data redundancy while also improving data efficiency and integrity.

Note: Database Normalization was first proposed by Edgar F. Codd as a small section in his relational model of databases. It has now evolved as a very crucial aspect of driving efficiency in enterprise database models. Get a job in this field by reading answers to the most commonly asked information technology interview questions.

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12. What is BCNF (Boyce-Codd Normal Form)?

The Boyce-Codd Normal Form is a type of Data Normalization whose goal is to increase the data integrity by adequately organizing the columns and tables within a relational database.

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