Questions in: Developer

Right Answer:
System programming is the process of creating software that provides services to the hardware or manages system resources, typically involving operating systems, device drivers, and system utilities.

Right Answer:
M4 is a macro processor used in programming and text processing that allows for the definition and expansion of macros, enabling code generation and manipulation of text files.

Right Answer:
I have a degree in Computer Science and several years of experience in C programming, including developing applications, debugging, and optimizing code.

Right Answer:
1. **Prioritization**: Use the Eisenhower Matrix to prioritize tasks based on urgency and importance.
2. **Time Blocking**: Allocate specific time slots for focused work on tasks to minimize distractions.
3. **Automation**: Utilize tools and scripts to automate repetitive tasks, reducing manual effort.
4. **Daily Stand-ups**: Conduct brief daily meetings to align on goals and address any blockers.
5. **Task Management Tools**: Use tools like Trello or Asana to track progress and deadlines.
6. **Continuous Learning**: Dedicate time for learning new technologies or methods to improve skills.
7. **Feedback Loops**: Regularly seek feedback to identify areas for improvement and adjust workflows accordingly.
8. **Breaks**: Schedule short breaks to maintain focus and prevent burnout.

Right Answer:
A servlet is a Java program that runs on a web server and handles client requests, typically generating dynamic web content by processing data and responding to HTTP requests.

Right Answer:
You can add a constraint to a table using the SQL `ALTER TABLE` statement. For example:

```sql
ALTER TABLE table_name
ADD CONSTRAINT constraint_name constraint_type (column_name);
```

Replace `constraint_type` with the type of constraint (e.g., PRIMARY KEY, FOREIGN KEY, UNIQUE, CHECK) and specify the relevant `column_name`.

Right Answer:
You can remove duplicate values in rows by using the SQL `DISTINCT` keyword in your query, or by using the `GROUP BY` clause. In programming languages like Python, you can use a set to eliminate duplicates from a list.

Right Answer:
Constructors are special functions that are called when an object is created to initialize it, while destructors are special functions called when an object is destroyed to clean up resources.

Right Answer:
No, in C, there are no interfaces like in some other languages, so the concept of private interfaces does not apply.

Right Answer:
In C, the `static` keyword is used to define variables that retain their value between function calls and have a scope limited to the file or function they are declared in. The `dynamic` keyword is not a standard keyword in C; instead, dynamic memory allocation is typically handled using functions like `malloc`, `calloc`, and `free`, which manage memory at runtime.

Right Answer:
A primary key uniquely identifies each record in a table and cannot contain null values, while a unique key also ensures uniqueness for a column but can allow one null value.

Right Answer:
You can fetch the 2nd highest salary using the following SQL query:

```sql
SELECT MAX(salary)
FROM employees
WHERE salary < (SELECT MAX(salary) FROM employees);
```

Right Answer:
In C, there is no built-in garbage collector like in some other languages. However, you can manage memory manually using `malloc()` to allocate memory and `free()` to deallocate it when it's no longer needed. To implement a form of garbage collection, you can use reference counting or mark-and-sweep algorithms, but these require additional coding and data structures to track memory usage.

Right Answer:
The default access modifier of a class in C is "extern."

Right Answer:
The main difference between `string` and `StringBuilder` in C# is that `string` is immutable, meaning once it is created, it cannot be changed. Any modification creates a new string. In contrast, `StringBuilder` is mutable, allowing for modifications without creating new instances, making it more efficient for frequent changes.

Right Answer:
A garbage collector is a form of automatic memory management that reclaims memory occupied by objects that are no longer in use by the program, preventing memory leaks and optimizing resource usage.

Right Answer:
```c
#include <stdio.h>
#include <string.h>
#include <ctype.h>

void removeWhitespace(char *str) {
char *ptr = str;
char *end = str;

while (*end) {
if (!isspace((unsigned char)*end)) {
*ptr++ = *end;
}
end++;
}
*ptr = '';
}

int main() {
char str[] = " Hello, World! ";
removeWhitespace(str);
printf("%sn", str);
return 0;
}
```

Right Answer:
The person in this job typically reports to their direct manager or team lead.

Right Answer:
The company has provided me with opportunities for professional development, mentorship, and access to training resources, which have helped me enhance my skills and advance my career.