ICSE Class 10 Computer Applications — 2016 Paper

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.

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

(c) Name any two library packages.

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;

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]

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

equals()	==
It is a method	It is a relational operator
It is used to check if the contents of two strings are same or not	It is used to check if two variables refer to the same object in memory
Example: String s1 = new String("hello"); String s2 = new String("hello"); boolean res = s1.equals(s2); System.out.println(res); The output of this code snippet is true as contents of s1 and s2 are the same.	Example: String s1 = new String("hello"); String s2 = new String("hello"); boolean res = s1 == s2; System.out.println(res); The output of this code snippet is false as s1 and s2 point to different String objects.

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

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

1. Explicit Cast.
2. Implicit Cast.

(c) Differentiate between formal parameter and actual parameter.

Formal parameter	Actual parameter
Formal parameters appear in function definition.	Actual parameters appear in function call statement.
They represent the values received by the called function.	They represent the values passed to the called function.

(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.

int PosChar(String s, char ch)

(e) Name any two types of access specifiers.

1. public
2. private

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)

1. 5.0
2. 4

(c) What is a parameterized constructor ?

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:

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

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");

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--;
}

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.

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;
}

5
10

Loop executes 3 times.

Below dry run of the loop explains its working.

m	Output	Remarks
5	5	1st Iteration
10	5 10	2nd Iteration
15	5 10	3rd Iteration — As m % 3 becomes true, break statement exists the loop.

(i) Give the output of the following expression:

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

    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)

1. boolean
2. String

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();
    }
}

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");
        }
    }
}

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");
        }
        
    }
}

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);
    }
}

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");
    }
}

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!");
    }
}