Answered: .It is an instance of the class Select…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question: Choose the correct one.

Note: Give me all the answers without explanation.

1.It is an instance of the class

Select one:

a. Method

b. Object

c. Data member

d. Constructor

2.The encapsulation concept means.

Select one:

a. The class has private constructors and methods

b. The data members are public access

c. The data members are private access

d. you can't access the members of the class even from the class itself

3.char A[]="hahahah"; char* p=&A[0]; *p='na'; p="CII"; cout<<A; the output is.

Select one:

a. CIIhahahah

b. hahahah

c. aahahah

d. nahahah

4.Let A is char array as follows: char A[]=”hahahah”; the length of A

Select one:

a. 32 characters

b. 7 characters

c. 28 characters

d. 8 characters

5.class A{int x;}; class B:public A{int y;public: void add(){y=++x;}};to correct the error.

Select one:

a. We should use protected: in class A

b. We should use private: in class A

c. We should use protected: in class B

d. We should use public: in class B

6.The class can have many destructors

Select one:

True

False

7.class A{int x; public:A(int x1){x=x1 ;}}; class B{A aa;}; we write in main: B b1; a syntax error occured because

Select one:

a. A has no default constructor

b. B has no default constructor

c. B has no public

d. B should have constructor with parameter

8.int *Arr[4]; int **p=Arr; int ptarr[3]={100,200,300}; int *pt1=new int[3]; Arr[0]=pt1; Arr[1]=ptarr; to set the first item in pt1 as the first item in ptarr

Select one:

a. *(*(p+0)+1)=*(*p+1)+1;

b. **p=*(*(p+1));

c. p[0][1]=p[1][0];

d. *(*(p+0)+0)=*(*p+1);

9.int B[5]={10,20,30,40,50}; int *p=&B[2]; to print the first item in B

Select one:

a. cout<<p-2;

b. cout<<*--p;

c. cout<<p[-2];

d. cout<<*((--p)--);

10.Where a protected member can be accessed?

Select one:

a. Within the same class only

b. Outside of the class

c. Within the same class and the derived class

d. Within the Derived class only

11.class A{int x; public:A(){ }}; we write in main: A a[5];

Select one:

a. 5 objects are created each one has value of x=0

b. Syntax error

c. 5 objects are created but each one has rubbish data for x

d. No objects are created

12.class A{int x;

public:

A( ){x=0;}

void set(int x1){x=x1;}

int get(){return x;}

}a1(10)

Select one:

a. No syntax errors

b. It has syntax and logical errors

c. The code has one syntax error

d. The code has two syntax errors

13.class TV has one private integer data attribute and has one constructor with parameter. Which of the following is False?

Select one:

a. TV LG(100);

b. TV *p=new TV;

c. TV *p;

d. TV *p=0;

14.The name of the array is a pointer. It can point to any cell of the array

Select one:

True

False

15.int *Arr[4]; int **p=Arr; int *pt1=new int[3]; Arr[0]=pt1; to set the last element in array pt1 to -9

Select one:

a. **(p+2)=-9;

b. *(*p+2)=-9;

c. *(p++)[2]=-9;

d. *(p[2]-2)=-9;

16.int *Arr[4]; int **p=Arr; int ptarr[3]={100,200,300}; Arr[1]=ptarr; to add 1 to the second element in the array ptarr

Select one:

a. ++(*(p+1)[1]);

b. *(*(p+1))+=1;

c. ++*((*p+1)+1);

d. ++*(*(p+1)+1);

e. *(*(p+1)+1)=*(*p)+1;

17.The difference between the class and the struct is

Select one:

a. class data members by default are public while the struct are private

b. class data members by default are private while the struct are also private

c. class data members by default are public while the struct are also public

d. class data members by default are private while the struct are public

18.How many constructors can present in a class?

Select one:

a. 1

b. Multiple

c. 2

d. None

19.int B[5]={10,20,30,40,50}; int *p=&B[2]; to add 1 to the last item in B

Select one:

a. *(p+2)+=1;

b. *(p+2)++;

c. p[2]+1;

d. *B+2=51;

20.char *p="C++II"; the size of p

Select one:

a. 4 bytes

b. 5 bytes

c. 20 bytes

d. 6 bytes

21.Let B is an array of 5 integers as follows: int B[5]={10,20,30,40,50}; to define a pointer p points to item 20 in B

Select one:

a. int *p=B[1];

b. int *p=&B[2];

c. int *p=B+1;

d. int *p=&B+1;

22.class A is super of class B and B is super of class C, when we create C object the execution of constructors is

Select one:

a. A, B, C

b. C, A, B

c. C, B, A

d. A, C, B

23.Let A, B are two arrays of char, to check if A and B are matches

Select one:

a. if(strcmp(A,B)!=0) cout<<”Match”;

b. if(!strcmp(A,B) cout<<”Match”;

c. if(strcmp(A,B) cout<<”Match”;

d. if(strcmp(A,B)==1) cout<<”Match”;

24.The class A has a constructer with parameters and class B should have an object of the class A then

Select one:

a. The created object of class B must be with parameter

b. can't combine the two classes

c. class B should have default constructor

d. class A should have default constructor

25.class A{int x; public: A(int x1){x=x1;}A(){x=0;} }; class B{A aa; public: B(int x); }; the best way to implement the constructor of B

Select one:

a. B::B(int x){aa.x=x;}

b. B::B(int x){A a(x); aa=a;}

c. B::B(int x){A aa(x);}

d. B::B(int x){this->x=x;}

26.Assume int *Arr[4]; int **p=Arr; to let the last item in Arr points to "nothing"

Select one:

a. (*(*p+3))=0;

b. (*Arr[3])=0;

c. p+3=NULL;

d. Arr[3]=0;

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