Interview questions for programming

The main usage of C programming language includes Language Compilers, Operating Systems, Assemblers, Text Editors, Print Spoolers, Network Drivers, Modern Programs, Data Bases, Language Interpreters and Utilities.
Most Common C Programming Interview Questions

1. What are the key features in the C programming language?

• Portability: It is a platform-independent language.
• Modularity: Possibility to break down large programs into small modules.
• Flexibility: The possibility of a programmer to control the language.
• Speed: C comes with support for system programming and hence it compiles and executes with high speed when compared with other high-level languages.
• Extensibility: Possibility to add new features by the programmer.

2. What do you enjoy about programming?

I love looking through code so I can find errors and fix them. In fact, I’ve always loved fixing things methodically. When I was a kid, my dad and I fixed a 1967 Mustang. It took a meticulous approach and a lot of patience. I feel the same way about reviewing code.”

3. What are the basic data types associated with C?

• Int – Represent the number (integer)
• Float – Number with a fraction part.
• Double – Double-precision floating-point value

4. What’s the hardest thing about working as a computer programmer?

It’s natural for computer programmers to hide their weaknesses. As an employer, though, you need to find each person’s weaknesses and strengths. It’s natural for computer programmers to hide their weaknesses. As an employer, though, you need to find each person’s weaknesses and strengths.

5. What are reserved words with a programming language?

The words that are a part of the standard C language library are called reserved words. Those reserved words have special meaning and it is not possible to use them for any activity other than its intended functionality.

6. What’s the most recent language that you learned?

New languages emerge frequently. Knowing what an applicant has learned recently will tell you whether that person has an interest in keeping up with newer languages. I probably don’t keep up with as many new languages as I should, but I’ve learned a lot since I graduated from college. In school, I had to focus on C++. Outside of class, I spent time experimenting with newer languages like Julia and Swift.

7. What is the explanation for the dangling pointer in C?

When there is a pointer pointing to a memory address of any variable, but after some time the variable was deleted from the memory location while keeping the pointer pointing to that location is known as a dangling pointer in C.

8. Tell Me Why Constructors Does Not Supports Visual Functions?

Constructor does not support virtual functions because we need an object to invoke a virtual method in the first place and more over constructors are used to initializing objects, which is a static type. Virtual functions are invoked on the dynamic type of the object, hence the object may not be properly initialized when a constructor call is made. Since the derived part of the object would not be initialized during the execution of base class constructor, hence calling any virtual method from base class constructor does not work well.

9. Describe static function with its usage?

A function, which has a function definition prefixed with a static keyword is defined as a static function. The static function should be called within the same source code.

10. What Is Race Around Condition?

A race around condition is a fault in the process or a system where the output or the result of the process is critically and unexpectedly dependent on the timing of other events. Race condition especially occurs in multithreaded or in distributed systems.

11. What is the difference between abs() and fabs() functions?

Both functions are to retrieve absolute value. abs() is for integer values and fabs() is for floating type numbers. Prototype for abs() is under the library file < stdlib.h > and fabs() is under < math.h >.

12. Explain How To Calculate Response Time In Client-server Technology?

This can be done by measuring the time taken by the first byte to reach the client (TTFB) and the time taken by the last byte of the response to reach the client (TTLB) by using various network bandwidths between the client and the server.

13. Define Rom Image And Explain Each Section Of A Rom Image In An Exemplary System?

A ROM image captures the data from a read-only memory chip, such as hardware firmware, video and arcade game boards, etc. It is often used for emulation.

14. What is the difference between ++a and a++?

‘++a” is called prefixed increment and the increment will happen first on a variable. ‘a++’ is called postfix increment and the increment happens after the value of a variable used for the operations.

15. What Is Dirty Dimension?

If a Record occurs more than one time in a table by the difference of a non-key attribute then such a dimension is called Dirty Dimemsion.

16. Describe the difference between = and == symbols in C programming?

‘==’ is the comparison operator which is used to compare the value or expression on the left-hand side with the value or expression on the right-hand side.
‘=’ is the assignment operator which is used to assign the value of the right-hand side to the variable on the left-hand side.

17. What is the explanation for prototype function in C?

Prototype function is a declaration of a function with the following information to the compiler.
• Name of the function.
• The return type of the function.
• Parameters list of the function.

18. What are the general description for loop statements and available loop types in C?

A statement that allows the execution of statements or groups of statements in a repeated way is defined as a loop.

19. What are the valid places for key board break to appear?

Break can appear only with in the looping control and switch statement. The purpose of the break is to bring the control out from the said blocks.

20. What is a pointer on a pointer in C programming language?

A pointer variable that contains the address of another pointer variable is called pointer on a pointer. This concept de-refers twice to point to the data held by a pointer variable.