3i Infotech Papers: Sample Questions 741 - 742 of 1245

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Question number: 741

» Languages » C & C Plus Plus

Essay Question▾

Describe in Detail

What is the output of the following program?

  1. main ()
  2. {
  3.     char * p = “GOOD” ;
  4.     char a[ ] = “GOOD” ;
  5.     printf ( “  sizeof (p) = %dsizeof ( * p) = %dstrlen (p) = %d” sizeof (p), sizeof ( * p), strlen (p) );
  6.     printf ( “  sizeof (a) = %dstrlen (a) = %d” ,sizeof (a), strlen (a) );
  7. }

Explanation

Size of (p) = 2, size of (*p) = 1, strlen (p) = 4 size of (a) = 5, strlen (a) = 4

In the program

Table shows the program

Table shows the program

char * p = “GOOD”;

  • Given the character pointer p=”GOOD”

char a [] = “GOOD”;

  • Given the character array a

printf (“ sizeof (p) =%d, sizeof (* p) =%d, strlen (p) =%d” sizeof (p), sizeof (* p), strlen (p) );

  • Here sizeof (p) = > izeof (char*) = > 2

    sizeof (*p) = > izeof (char) = > 1

  • When sizeof operator is applied to an array it returns the sizeof the array and it is not the same as the sizeof the pointer variable

printf (“ sizeof (a) =%d, strlen (a) =%d”, sizeof (a), strlen (a) );

  • sizeof (a) = > size of the character array = > 5

  • here the sizeof (a) where a is the character array and the size of the array is 5

  • because the space necessary for the terminating NULL character should also be taken into account

Question number: 742

» Basic CS » Operating System

Short Answer Question▾

Write in Short

What is a binary semaphore? What is its use?

Explanation

State diagram of binary semaphore

State Diagram of Binary Semaphore

State diagram of binary semaphore.

  • Binary semaphores are binary- can take only two values.

  • “1” might represent a process is in the critical section and other should wait, the other indicating the critical section is free.

  • Sometime easier to implement than counting semaphore.

  • Binary semaphore are used as mutex locks, to implement mutual exclusion and synchronize concurrent processes.