What are the different types of system calls?

Correct Answer: UDP (User Datagram Protocol) is a communications protocol that offers a limited amount of service when messages are exchanged between computers in a network that uses the Internet Protocol (IP)

Correct Answer: A 32 bit processor is faster than a 64 bit processor, 64 bit processors are very commonly used that you can find it easily in any home pc but the main difference is the hardware you are having on your machine For 32 bits there isn't any need of any wide main bus to carry 32 bits at a time but for 64 bits its must that you should have a wider bus to carry 64bits

Correct Answer: Dual boot system allows you to install and maintain two operating systems on a single PC The purpose for this is to maintain compatibility between older and newer software For example, there maybe programs that only work under Windows 98, therefore having a dual boot system between Windows 98 and another version like Windows XP is a good choice

Correct Answer: Arrays can store data in a fix allotted space The use of linked list allows more flexibility because space is dynamically allocated as needed

Correct Answer: COM is short for Component Object Model It is a Microsoft technology that allows developers to make use of reusable components and services provided by Microsoft COM technology includes COM+, DCOM and ActiveX

Correct Answer: A stored procedure is a segment of declarative SQL statements stored inside the database catalog A stored procedure can be invoked by triggers, other stored procedures or applications such as Java, C#, PHP, etc Advantages - Typically stored procedures help increase the performance of the applications Once created, stored procedures are compiled and stored in the database However MySQL implements the stored procedures slightly different MySQL stored procedures are compiled on demand After compiling a stored procedure, MySQL puts it to a cache And MySQL maintains its own stored procedure cache for every single connection If an application uses a stored procedure multiple times in a single connection, the compiled version is used, otherwise the stored procedure works like a query - Stored procedures helps reduce the traffic between application and database server because instead of sending multiple lengthy SQL statements, the application has to send only name and parameters of the stored procedure - Stored procedures are reusable and transparent to any applications Stored procedures expose the database interface to all applications so that developers don?t have to develop functions that are already supported in stored procedures - Stored procedures are secure Database administrator can grant appropriate permissions to applications that access stored procedures in the database without giving any permission on the underlying database tables Disadvantages - If you use a lot of stored procedures, the memory usage of every connection that is using those stored procedures will increase substantially In addition, if you overuse a large number of logical operations inside store procedures, the CPU usage will also increase because database server is not well-designed for logical operations - A constructs of stored procedures make it more difficult to develop stored procedures that have complicated business logic - It is difficult to debug stored procedures Only few database management systems allow you to debug stored procedures Unfortunately, MySQL does not provide facilities for debugging stored procedures -It is not easy to develop and maintain stored procedures Developing and maintaining stored procedures are often required specialized skill set that not all application developers possess This may lead to problems in both application development and maintenance phases

Correct Answer: 1 Have two indexes pointing to two ends of array, say i and j 2 Approach towards each other with a check condition that they dont cross each other 3 Each iteration of while loop, swap the numbers pointed by two indexes when num[i] index number is not equal to 1 void sort() { int a[]={1,0,0,0,1,1,0,1,0,1,0,0,1,0}; int i=0; int j=13; int temp; while(j>i) { if(a[i]==1) i++; if(a[j]==0) j--; if(a[i]==0) { temp=a[i]; a[i]=a[j]; a[j]=temp; } } for(i=0;i<14;i++) ConsoleWrite(a[i]+", "); } Output: 1,1,1,1,1,1,0,0,0,0,0,0,0

Correct Answer: This problem isn't too hard You just need to start at the head of the list, and iterate to the end At each node, swap the values of pNext and pPrev Finally, set pHead to the last node in the list Node * pCurrent = pHead, *pTemp; while (pCurrent) { pTemp = pCurrent->pNext; pCurrent->pNext = pCurrent->pPrev; pCurrent->pPrev = temp; pHead = pCurrent; pCurrent = temp; }

Correct Answer: public class Test { public void replaseSpaces(char[] str, int length) { int spaceCount = 0, newLength = 0, i = 0; for(i = 0; i < length; i++) { if (str[i] == ' ') spaceCount++; } newLength = length + (spaceCount * 2); str[newLength] = '\0'; for(i = length - 1; i >= 0; i--) { if (str[i] == ' ') { str[newLength - 1] = '0'; str[newLength - 2] = '2'; str[newLength - 3] = '%'; newLength = newLength - 3; } else { str[newLength - 1] = str[i]; newLength = newLength - 1; } } Systemoutprintln(str); } public static void main(String[] args) { Test tst = new Test(); char[] ch = {'t', 'h', 'e', ' ', 'd', 'o', 'g', ' ', ' ', ' ', ' ', ' ', ' '}; int length = 6; tstreplaseSpaces(ch, length); } }

Correct Answer: A system call is a functionsubroutine which interrupts the currently executing program and transfers control to the interrupt routineThe contents of the executing program are saved and after the interrupt routine finishes its function,control is transferred back to the executing program If we talk in the context of Linux then System calls are called kernel mode Whereas API (Application Programming Interface) is a function or a set of functions, objects, protocols or data-structures for the support of application development for developers/programmers It is actually a kind of function definition which specifies how to make available of a specific service of the system/OS to the other program/process or system Read more at: https://wwwqueryhomecom/48442/os-what-is-difference-between-system-call-and-api