ISC Class 12th Computer Science Chapter 9 - Arrays, Strings Important Questions with Answers

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int Toy(int n)
{ return (n<=0)? 1: n%10 + Toy(n/10); }

With reference to the program code given above, what will the function Toy() return when the value of n = 56?

651

Question 2.

Write the statement in Java to extract the word “MISS” from the word “SUBMISSION”.

Question 3.

What is the output of the statement given below?

System.out.print("FAN" + ("AUTOMATIC".charAt(5) ) );

Question 4.

Design a class Check which checks whether a word is a palindrome or not.

(Palindrome words are those which spell the same from either ends).

Example: MADAM, LEVEL etc.

The details of the members of the class are given below:

Class name	Check
Data members/instance variables:
wrd	stores a word
len	to store the length of the word
Methods/Member functions:
Check( )	default constructor
void acceptword( )	to accept the word
boolean palindrome( )	checks and returns ‘true’ if the word is a palindrome otherwise returns ‘false’
void display( )	displays the word along with an appropriate message

Specify the class Check giving details of the constructor, void acceptword( ), boolean palindrome( ) and void display( ). Define the main( ) function to create an object and call the functions accordingly to enable the task.

Question 5.

Design a class Toggle which toggles a word by converting all upper case alphabets to lower case and vice versa.

Example: The word “mOTivATe” becomes “MotIVatE”

The details of the members of the class are given below:

Class name	Toggle
Data members/instance variables:
str	stores a word
newstr	stores the toggled word
len	to store the length of the word
Methods/Member functions:
Toggle( )	default constructor
void readword( )	to accept the word
void toggle( )	converts the upper case alphabets to lower case and all lower case alphabets to upper case and stores it in newstr
void display( )	displays the original word along with the toggled word

Specify the class Toggle giving details of the constructor, void readword( ), void toggle( ) and void display( ). Define the main( ) function to create an object and call the functions accordingly to enable the task.

Question 6.

State any one use of interfaces in Java.

Question 7.

An array ARR [ -5 .....15, 10.....20] stores elements in Row Major Wise with each element requiring 2 bytes of storage. Find the address of ARR [10] [15] when the base address is 2500.

Question 8.

Assertion: In Java, the String class is used to create and manipulate strings, and it is immutable.

Reason: Immutability ensures that once a String object is created, its value cannot be changed.

Both Assertion and Reason are true and Reason is the correct explanation for Assertion.

Both Assertion and Reason are true but Reason is not the correct explanation for Assertion.

Assertion is true and Reason is false.

Assertion is false and Reason is true.

Question 9.

A matrix M[-6….10, 4…15] is stored in the memory, with each element requiring 4 bytes of storage. If the base address is 1025, find the address of M[4][8] when the matrix is stored in column major-wise.

Question 10.

The following function getIt() is a part of some class. Assume x is a positive integer, f is the lower bound of arr[ ] and l is the upper bound of the arr[ ].

Answer the questions given below along with dry run/working.

public int getIt(int x,intarr[],int f,int l)
  {
   if(f>l)
     return-1;
   int m=(f+l)/2;
   if(arr[m]<x)
     return getIt(x,m+1,l);
   else if(arr[m]>x)
     return getIt(x,f,m-1);
   else
     return m;
}

What will the function getIt( ) return if arr[ ] = {10,20,30,40,50} and x = 40?
What is function getIt( ) performing apart from recursion?

Question 1.

Given are two strings, input string and a mask string that remove all the characters of the mask string from the original string.

Example:	INPUT:	ORIGINALSTRING:	communication
		MASK STRING:	mont
	OUTPUT:	cuicai

A class StringOp is defined as follows to perform above operation.

Some of the members of the class are given below:

Class name	StringOp
Data members/instance variables:
str	to store the original string
msk	to store the mask string
nstr	to store the resultant string
Methods / Member functions:
StringOp()	default constructor to initialize the data member with legal initial value
void accept( )	to accept the original string str and the mask string msk in lower case
void form()	to form the new string nstr after removal of characters present in mask from the original string
void display( )	to display the original string and the newly formed string nstr

Specify the class StringOp giving details of the constructor( ), void accept( ), void form() and void display( ). Define a main( ) function to create an object and call all the functions accordingly to enable the task.

Question 2.

A class Mixarray contains an array of integer elements along with its capacity (More than or equal to 3). Using the following description, form a new array of integers which will contain only the first 3 elements of the two different arrays one after another.

Example:

Array1: { 78, 90, 100, 45, 67 }

Array2: {10, 67, 200, 90 }

Resultant Array: { 78, 90, 100, 10, 67, 200}

The details of the members of the class are given below:

Class name	Mixarray
Data members/instance variables:
arr[]	integer array
cap	integer to store the capacity of the array
Member functions/methods:
Mixarray (int mm )	to initialize the capacity of the array cap=mm
void input( )	to accept the elements of the array
Mixarray mix(Mixarray P, Mixarray Q)	returns the resultant array having the first 3 elements of the array of objects P and Q
void display( )	to display the array with an appropriate message.

Specify the class Mixarraygiving details of the constructor(int), void input( ), Mixarray mix(Mixarray,Mixarray) and void display( ). Define a main( ) function to create objects and call all the functions accordingly to enable the task.