Solved 2016 Question Paper ICSE Class 10 Computer Applications

Section A

Question 1

(a) Define Encapsulation.

Answer

Encapsulation is a mechanism that binds together code and the data it manipulates. It keeps them both safe from the outside world, preventing any unauthorised access or misuse. Only member methods, which are wrapped inside the class, can access the data and other methods.

(b) What are keywords ? Give an example.

Answer

Keywords are reserved words that have a special meaning to the Java compiler. Example: class, public, int, etc.

(c) Name any two library packages.

Answer

Two library packages are:

1. java.io
2. java.util

(d) Name the type of error ( syntax, runtime or logical error) in each case given below:

1. Math.sqrt (36 – 45)
2. int a;b;c;

Answer

1. Runtime Error
2. Syntax Error

(e) If int x[] = { 4, 3, 7, 8, 9, 10}; what are the values of p and q ?

1. p = x.length
2. q = x[2] + x[5] * x[1]

Answer

1. 6
2. q = x[2] + x[5] * x[1]
   q = 7 + 10 * 3
   q = 7 + 30
   q = 37

Question 2

(a) State the difference between == operator and equals() method.

Answer

(b) What are the types of casting shown by the following examples:

1. char c = (char) 120;
2. int x = ‘t’;

Answer

1. Explicit Cast.
2. Implicit Cast.

(c) Differentiate between formal parameter and actual parameter.

Answer

(d) Write a function prototype of the following:
A function PosChar which takes a string argument and a character argument and returns an integer value.

Answer

int PosChar(String s, char ch)

(e) Name any two types of access specifiers.

Answer

1. public
2. private

Question 3

(a) Give the output of the following string functions:

1. "MISSISSIPPI".indexOf('S') + "MISSISSIPPI".lastIndexOf('I')
2. "CABLE".compareTo("CADET")

Answer

1. 2 + 10 = 12
2. ASCII Code of B - ASCII Code of D
   ⇒ 66 - 68
   ⇒ -2

(b) Give the output of the following Math functions:

1. Math.ceil(4.2)
2. Math.abs(-4)

Answer

1. 5.0
2. 4

(c) What is a parameterized constructor ?

Answer

A Parameterised constructor receives parameters at the time of creating an object and initializes the object with the received values.

(d) Write down java expression for:

$T = \sqrt{A^2 + B^2 + C^2}$

Answer

T = Math.sqrt(a*a + b*b + c*c)

(e) Rewrite the following using ternary operator:

if (x%2 == 0)
System.out.print("EVEN");
else
System.out.print("ODD");

Answer

System.out.print(x%2 == 0 ? "EVEN" : "ODD");

(f) Convert the following while loop to the corresponding for loop:

int m = 5, n = 10;
while (n>=1)
{
    System.out.println(m*n);
    n--;
}

Answer

int m = 5;
for (int n = 10; n >= 1; n--) {
    System.out.println(m*n);
}

(g) Write one difference between primitive data types and composite data types.

Answer

Primitive Data Types are built-in data types defined by Java language specification whereas Composite Data Types are defined by the programmer.

(h) Analyze the given program segment and answer the following questions:

1. Write the output of the program segment.
2. How many times does the body of the loop gets executed ?

for(int m = 5; m <= 20; m += 5)
{    if(m % 3 == 0)
        break;
    else
        if(m % 5 == 0)
            System.out.println(m);
    continue;
}

Answer

Output

5
10

Loop executes 3 times.

Below dry run of the loop explains its working.

(i) Give the output of the following expression:

a+= a++ + ++a + --a + a-- ; when a = 7

Answer

    a+= a++ + ++a + --a + a--
⇒ a = a + (a++ + ++a + --a + a--)
⇒ a = 7 + (7 + 9 + 8 + 8)
⇒ a = 7 + 32
⇒ a = 39

(j) Write the return type of the following library functions:

1. isLetterOrDigit(char)
2. replace(char, char)

Answer

1. boolean
2. String

Section B

Question 4

Define a class named BookFair with the following description:

Instance variables/Data members:
String Bname — stores the name of the book
double price — stores the price of the book

Member methods:
(i) BookFair() — Default constructor to initialize data members
(ii) void Input() — To input and store the name and the price of the book.
(iii) void calculate() — To calculate the price after discount. Discount is calculated based on the following criteria.

(iv) void display() — To display the name and price of the book after discount.

Write a main method to create an object of the class and call the above member methods.

Answer

import java.util.Scanner;

public class BookFair
{
    private String bname;
    private double price;
    
    public BookFair() {
        bname = "";
        price = 0.0;
    }
    
    public void input() {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter name of the book: ");
        bname = in.nextLine();
        System.out.print("Enter price of the book: ");
        price = in.nextDouble();
    }
    
    public void calculate() {
        double disc;
        if (price <= 1000)
            disc = price * 0.02;
        else if (price <= 3000)
            disc = price * 0.1;
        else
            disc = price * 0.15;
            
        price -= disc;
    }
    
    public void display() {
        System.out.println("Book Name: " + bname);
        System.out.println("Price after discount: " + price);
    }
    
    public static void main(String args[]) {
        BookFair obj = new BookFair();
        obj.input();
        obj.calculate();
        obj.display();
    }
}

Output

Question 5

Using the switch statement, write a menu driven program for the following:

(i) To print the Floyd’s triangle [Given below]

1
2   3
4   5   6
7   8   9  10
11 12 13 14 15

(b) To display the following pattern:
I
I C
I C S
I C S E

For an incorrect option, an appropriate error message should be displayed.

Answer

import java.util.Scanner;

public class KboatPattern
{
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        System.out.println("Type 1 for Floyd's triangle");
        System.out.println("Type 2 for an ICSE pattern");
        
        System.out.print("Enter your choice: ");
        int ch = in.nextInt();
        
        switch (ch) {
            case 1:
            int a = 1;
            for (int i = 1; i <= 5; i++) {
                for (int j = 1; j <= i; j++) {
                    System.out.print(a++ + "\t");
                }
                System.out.println();
            }
            break;
            
            case 2:
            String s = "ICSE";
            for (int i = 0; i < s.length(); i++) {
                for (int j = 0; j <= i; j++) {
                    System.out.print(s.charAt(j) + " ");
                }
                System.out.println();
            }
            break;
            
            default:
            System.out.println("Incorrect Choice");
        }
    }
}

Output

Question 6

Special words are those words which start and end with the same letter.
Example: EXISTENCE, COMIC, WINDOW
Palindrome words are those words which read the same from left to right and vice-versa.
Example: MALYALAM, MADAM, LEVEL, ROTATOR, CIVIC
All palindromes are special words but all special words are not palindromes.

Write a program to accept a word. Check and display whether the word is a palindrome or only a special word or none of them.

Answer

import java.util.Scanner;

public class KboatSpecialPalindrome
{
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter a word: ");
        String str = in.next();
        str = str.toUpperCase();
        int len = str.length();
        
        if (str.charAt(0) == str.charAt(len - 1)) {
            boolean isPalin = true;
            for (int i = 1; i < len / 2; i++) {
                if (str.charAt(i) != str.charAt(len - 1 - i)) {
                    isPalin = false;
                    break;
                }
            }
            
            if (isPalin) {
                System.out.println("Palindrome");
            }
            else {
                System.out.println("Special");
            }
        }
        else {
            System.out.println("Neither Special nor Palindrome");
        }
        
    }
}

Output

Question 7

Design a class to overload a function sumSeries() as follows:

(i) void sumSeries(int n, double x): with one integer argument and one double argument to find and display the sum of the series given below:

$s = \dfrac{x}{1} - \dfrac{x}{2} + \dfrac{x}{3} - \dfrac{x}{4} + \dfrac{x}{5} ...\space ...\space ...\space to \space n \space terms$

(ii) void sumSeries(): to find and display the sum of the following series:

$s = 1 + (1 \times 2) + (1 \times 2 \times 3) + ...\space ...\space ...\space + (1 \times 2 \times 3 \times 4 ...\space ...\space ...\space \times 20)$

Answer

public class KboatOverload
{
    void sumSeries(int n, double x) {
        double sum = 0;
        for (int i = 1; i <= n; i++) {
            double t = x / i;
            if (i % 2 == 0)
                sum -= t;
            else
                sum += t;
        }
        System.out.println("Sum = " + sum);
    }
    
    void sumSeries() {
        long sum = 0, term = 1;
        for (int i = 1; i <= 20; i++) {
            term *= i;
            sum += term;
        }
        System.out.println("Sum=" + sum);
    }
}

Output

Question 8

Write a program to accept a number and check and display whether it is a Niven number or not.
(Niven number is that number which is divisible by its sum of digits.).

Example:
Consider the number 126. Sum of its digits is 1 + 2 + 6 = 9 and 126 is divisible by 9.

Answer

import java.util.Scanner;

public class KboatNivenNumber
{
    public void checkNiven() {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter number: ");
        int num = in.nextInt();
        int orgNum = num;
        
        int digitSum = 0;
        
        while (num != 0) {
            int digit = num % 10;
            num /= 10;
            digitSum += digit;
        }
        
        /*
         * digitSum != 0 check prevents
         * division by zero error for the
         * case when users gives the number
         * 0 as input
         */
        if (digitSum != 0 && orgNum % digitSum == 0)
            System.out.println(orgNum + " is a Niven number");
        else
            System.out.println(orgNum + " is not a Niven number");
    }
}

Output

Question 9

Write a program to initialize the seven Wonders of the World along with their locations in two different arrays. Search for a name of the country input by the user. If found, display the name of the country along with its Wonder, otherwise display "Sorry not found!".

Seven Wonders:
CHICHEN ITZA, CHRIST THE REDEEMER, TAJ MAHAL, GREAT WALL OF CHINA, MACHU PICCHU, PETRA, COLOSSEUM

Locations:
MEXICO, BRAZIL, INDIA, CHINA, PERU, JORDAN, ITALY

Examples:
Country name: INDIA
Output: TAJ MAHAL

Country name: USA
Output: Sorry Not found!

Answer

import java.util.Scanner;

public class Kboat7Wonders
{
    public static void main(String args[]) {
        
        String wonders[] = {"CHICHEN ITZA", "CHRIST THE REDEEMER", "TAJMAHAL", 
            "GREAT WALL OF CHINA", "MACHU PICCHU", "PETRA", "COLOSSEUM"};
        
        String locations[] = {"MEXICO", "BRAZIL", "INDIA", "CHINA", "PERU", "JORDAN",
        "ITALY"};
        
        Scanner in = new Scanner(System.in);
        System.out.print("Enter country: ");
        String c = in.nextLine();
        int i;
        
        for (i = 0; i < locations.length; i++) {
            if (locations[i].equals(c)) {
                System.out.println(locations[i] + " - " + wonders[i]);
                break;
            }
        }
        
        if (i == locations.length)
            System.out.println("Sorry Not Found!");
    }
}

Output