ICSE Class 10 Computer Applications — 2015 Paper

Default value of int is 0 and float is 0.0f.

(b) Name any two OOP’s principles.

1. Encapsulation
2. Inheritance

(c) What are identifiers ?

Identifiers are symbolic names given to different parts of a program such as variables, methods, classes, objects, etc.

(d) Identify the literals listed below:

(i) 0.5 (ii) 'A' (iii) false (iv) "a"

1. Real Literal
2. Character Literal
3. Boolean Literal
4. String Literal

(e) Name the wrapper classes of char type and boolean type.

Wrapper class of char type is Character and boolean type is Boolean.

    int n = (q – p) > (p – q) ? (q – p) : (p – q)
⇒ int n = (19 - 5) > (5 - 19) ? (19 - 5) : (5 - 19)
⇒ int n = 14 > -14 ? 14 : -14
⇒ int n = 14 [∵ 14 > -14 is true so ? : returns 14]

Final value of n is 14

(b) Arrange the following primitive data types in an ascending order of their size:

(i) char (ii) byte (iii) double (iv) int

byte, char, int, double

(c) What is the value stored in variable res given below:

double res = Math.pow ("345".indexOf('5'), 3);

Value of res is 8.0
Index of '5' in "345" is 2. Math.pow(2, 3) means 2³ which is equal to 8

(d) Name the two types of constructors

Parameterized constructors and Non-Parameterized constructors.

(e) What are the values of a and b after the following function is executed, if the values passed are 30 and 50:

void paws(int a, int b)
{
    a=a+b;
    b=a–b;
    a=a–b;
    System.out.println(a+ "," +b);
}

Value of a is 50 and b is 30.
Output of the code is:

50,30

Data type of y is boolean and value is false. Character.isLetter() method checks if its argument is a letter or not and as 7 is a number not a letter hence it returns false.

(b) What is the function of catch block in exception handling ? Where does it appear in a program ?

Catch block contains statements that we want to execute in case an exception is thrown in the try block. Catch block appears immediately after the try block in a program.

(c) State the output when the following program segment is executed:

String a ="Smartphone", b="Graphic Art";
String h=a.substring(2, 5);
String k=b.substring(8).toUpperCase();
System.out.println(h);
System.out.println(k.equalsIgnoreCase(h));

The output of the above code is:

art
true

a.substring(2, 5) extracts the characters of string a starting from index 2 till index 4. So h contains the string "art". b.substring(8) extracts characters of b from index 8 till the end so it returns "Art". toUpperCase() converts it into uppercase. Thus string "ART" gets assigned to k. Values of h and k are "art" and "ART", respectively. As both h and k differ in case only hence equalsIgnoreCase returns true.

(d) The access specifier that gives the most accessibility is ________ and the least accessibility is ________.

The access specifier that gives the most accessibility is public and the least accessibility is private.

(e) (i) Name the mathematical function which is used to find sine of an angle given in radians.
(ii) Name a string function which removes the blank spaces provided in the prefix and suffix of a string.

(i) Math.sin() (ii) trim()

(f) (i) What will this code print ?

int arr[]=new int[5];
System.out.println(arr);

1. 0
2. value stored in arr[0]
3. 0000
4. garbage value

This code will print garbage value

(ii) Name the keyword which is used- to resolve the conflict between method parameter and instance variables/fields.

this keyword

(g) State the package that contains the class:

1. BufferedReader
2. Scanner

1. java.io
2. java.util

(h) Write the output of the following program code:

char ch ;
int x=97;
do
{
    ch=(char)x;
    System.out.print(ch + " " );
    if(x%10 == 0)
    break;
    ++x;
} while(x<=100);

Answer
The output of the above code is:

a b c d

The below table shows the dry run of the program:

x	ch	Output	Remarks
97	a	a	1st Iteration
98	b	a b	2nd Iteration
99	c	a b c	3rd Iteration
100	d	a b c d	4th Iteration — As x%10 becomes true, break statement is executed and exists the loop.

(i) Write the Java expressions for:

$\frac{a^2+b^2}{2ab}$

(a * a + b * b) / (2 * a * b)

(j) If int y = 10 then find int z = (++y * (y++ + 5));

    z = (++y * (y++ + 5))
⇒ z = (11 * (11 + 5))
⇒ z = (11 * 16)
⇒ z = 176

import java.util.Scanner;

public class ParkingLot
{
    private int vno;
    private int hours;
    private double bill;
    
    public void input() {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter vehicle number: ");
        vno = in.nextInt();
        System.out.print("Enter hours: ");
        hours = in.nextInt();
    }
    
    public void calculate() {
        if (hours <= 1)
            bill = 3;
        else
            bill = 3 + (hours - 1) * 1.5;
    }
    
    public void display() {
        System.out.println("Vehicle number: " + vno);
        System.out.println("Hours: " + hours);
        System.out.println("Bill: " + bill);
    }
    
    public static void main(String args[]) {
        ParkingLot obj = new ParkingLot();
        obj.input();
        obj.calculate();
        obj.display();
    }
}

public class KboatPattern
{
    public static void main(String args[]) {
        for (int i = 1; i <=5; i++) {
            for (int j = 1; j <= i; j++) {
                if (j % 2 == 0)
                    System.out.print("# ");
                else
                    System.out.print("* ");
            }
            System.out.println();
        }
    }
}

public class KboatPattern
{
    public static void main(String args[]) {
        for (int i = 1; i <=5; i++) {
            for (int j = 5; j >= i; j--) {
                System.out.print(j + " ");
            }
            System.out.println();
        }
    }
}

import java.util.Scanner;

public class KboatAvgMarks
{
    public static void main(String args[]) {
        
        Scanner in = new Scanner(System.in);
        System.out.print("Enter number of students: ");
        int n = in.nextInt();
        
        int rollNo[] = new int[n];
        String name[] = new String[n];
        int s1[] = new int[n];
        int s2[] = new int[n];
        int s3[] = new int[n];
        double avg[] = new double[n];
        
        for (int i = 0; i < n; i++) {
            System.out.println("Enter student " + (i+1) + " details:");
            System.out.print("Roll No: ");
            rollNo[i] = in.nextInt();
            in.nextLine();
            System.out.print("Name: ");
            name[i] = in.nextLine();
            System.out.print("Subject 1 Marks: ");
            s1[i] = in.nextInt();
            System.out.print("Subject 2 Marks: ");
            s2[i] = in.nextInt();
            System.out.print("Subject 3 Marks: ");
            s3[i] = in.nextInt();
            avg[i] = (s1[i] + s2[i] + s3[i]) / 3.0;
        }
        
        System.out.println("Roll No\tName\tRemark");
        for (int i = 0; i < n; i++) {
            String remark;
            if (avg[i] < 40) 
                remark = "Poor";
            else if (avg[i] < 60)
                remark = "Pass";
            else if (avg[i] < 75)
                remark = "First Class";
            else if (avg[i] < 85)
                remark = "Distinction";
            else
                remark = "Excellent";
            System.out.println(rollNo[i] + "\t" 
                + name[i] + "\t" 
                + remark);
        }
    }
}

public class KboatStringOverload
{
    public void joystring(String s, char ch1, char ch2) {
        String newStr = s.replace(ch1, ch2);
        System.out.println(newStr);
    }
    
    public void joystring(String s) {
        int f = s.indexOf(' ');
        int l = s.lastIndexOf(' ');
        System.out.println("First index:  " + f);
        System.out.println("Last index:  " + l);
    }
    
    public void joystring(String s1, String s2) {
        String newStr = s1.concat(" ").concat(s2);
        System.out.println(newStr);
    }
    
    public static void main(String args[]) {
        KboatStringOverload obj = new KboatStringOverload();
        obj.joystring("TECHNALAGY", 'A', 'O');
        obj.joystring("Cloud computing means Internet based computing");
        obj.joystring("COMMON WEALTH", "GAMES");
    }
}

import java.util.Scanner;

public class KboatArrangeNames
{
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        String names[] = new String[20];
        System.out.println("Enter 20 names:");
        for (int i = 0;  i < names.length; i++) {
            names[i] = in.nextLine();
        }

        //Bubble Sort
        for (int i = 0; i < names.length - 1; i++) {
            for (int j = 0; j < names.length - 1 - i; j++) {
                if (names[j].compareToIgnoreCase(names[j + 1]) < 0) {
                    String temp = names[j + 1];
                    names[j + 1] = names[j];
                    names[j] = temp;
                }
            }
        }
        
        System.out.println("\nSorted Names");
        for (int i = 0;  i < names.length; i++) {
            System.out.println(names[i]);
        }
    }
}

import java.util.Scanner;

public class KboatMenu
{
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        System.out.println("1. Factors of number");
        System.out.println("2. Factorial of number");
        System.out.print("Enter your choice: ");
        int choice = in.nextInt();
        int num;

        switch (choice) {
            case 1:
            System.out.print("Enter number: ");
            num = in.nextInt();
            for (int i = 1; i < num; i++) {
                if (num % i == 0) {
                    System.out.print(i + " ");
                }
            }
            System.out.println();
            break;

            case 2:
            System.out.print("Enter number: ");
            num = in.nextInt();
            int f = 1;
            for (int i = 1; i <= num; i++)
                f *= i;
            System.out.println("Factorial = " + f);
            break;
            
            default:
            System.out.println("Incorrect Choice");
            break;
        }
    }
}