ICSE Solved Paper, 2015 ~ A2Z Computer

ICSE Examination 2015 – 16 (Solution)

COMPUTER APPLICATION
Class – X
SECTION – A (40 MARKS)
Attempt all questions

Question 1:

(a) What are the default values of the primitive data types int and float? [2]

Ans: The default value of int is 0 and the default value of float is 0.0f.

(b) Name any two OOP’s principles. [2]

Ans: Abstraction, Encapsulation, Inheritance, Polymorphism.

(c) What are identifiers? [2]

Ans: Identifiers are names of variables, classes, packages, methods and packages in a java program.

(d) Identify the literals listed below:

(i) 0.5

(ii) 'A'

(iii) false

(iv) ''a'' [2]

Ans: - (i) Floating point literal

(ii) Character literal

(iii) Boolean literal

(iv) String literal

(e) Name the wrapper class of char type and boolean type. [2]

Ans: The wrapper class of char type is Character and the wrapper type of boolean type is Boolean.

Question 2:

(a) Evaluate the value of n if the value of p=5, q=19 [2]

int n = (q-p) > (p-q) ? (q-p) : (p-q);

Ans: n = 14

(b) Arrange the following primitive data types in an ascending order of their size: [2]

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

Ans: byte = 1 byte

char = 2 bytes

int = 4 bytes

double = 8 bytes

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

double res = Math.pow("345".indexOf('5'), 3); [2]

Ans: 8.0

(d) Name two types of constructor. [2]

Ans: Default constructor and parameterized constructor.

(e) What are the values of a and b after the following function is executed, if the values passed are 30 and 50: [2]

void paws(int a, int b)

{

a = a + b;

b = a - b;

a = a - b;

System.out.println(a + " , " + b);

}

Ans: 30, 50

Question 3:

(a) State the data type and the value of y after the following is executed : [2]

char x = '7';

y = Character.isLetter(x);

Ans: Data type of y will be boolean and value will be false.

(b) What is the function of catch block in exception handling? Where does it appear in a program? [2]

Ans: catch block catches the specified exception type and handles the same. It appears between try and finally block.

(c) State the output of the following program segment is executed: [2]

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));

Ans: art

true

(d) The access specifier that gives most accessibility is and the least accessibility is _____. [2]

Ans: public, private

(e) (i) Name the mathematical function which is used to find sine of an angle given in radians. [2]

(ii) Name a string function which removes the blank spaces provided in the prefix and suffix of a string.

Ans: (i) Math.sin()

(ii) trim()

(f) (i)What will the code print? [2]

int arr[] = new int [5];

System.out.println(arr);

(i) 0 (ii) value stored in arr[0] (iii) 0000 (iv) garbage value

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

Ans: (i) (iv) garbage value

(ii) this keyword

(g) State the package that contains the class : [2]

(i) BufferedReader

(ii) Scanner

Ans: (i) java.io

(ii) java.util

(h) Write the output of the following code segment: [2]

char ch;

int x = 97;

do{

ch = (char) x;

System.out.print(ch + " ");

if (x % 10 == 0)

break;

++x;

} while (x <= 100);

Ans: a b c d

(i) Write the java expression for: [2]

Ans: - (double) (Math.pow(a, 2) + Math.pow(b, 2)) / (2 * a * b)

(j) If int y = 10 then find int z = (++y * (y++ + 5)); [2]

Ans: 176

SECTION – B (60 MARKS)

Attempt any four questions

Question 4:

Define a class ParkingLot with the following description: [15]

Instance variables / Data members:

int vno – To store the vehicle number

int hours – To store the number of hours the vehicle is parked in the parking lot

double bill – To store the bill amount

Member methods:

void input() – To input and store vno and hours

void calculate() – To compute the parking charge at the rate of Rs.3 for the first hour or part thereof, and Rs.1.50 for each additional hour or part thereof.

void display() – To display the detail

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

Ans:

import java.util.*;

class ParkingLot {

private int vno; private int hours; private double bill;

public void input() {

Scanner sc = new Scanner(System.in); System.out.print("Enter vehicle number: "); vno = sc.nextInt();

System.out.print("Enter hours: "); hours = sc.nextInt();

}

public void calculate() {

bill = 3 + (hours - 1) * 1.50;

}

public void display() {

System.out.println("Vehicle number: " + vno); System.out.println("Hours: " + hours); System.out.println("Bill: Rs. " + bill);

}

public static void main() {

ParkingLot ob = new ParkingLot(); ob.input();

ob.calculate(); ob.display();

}

Question 5:

Write two separate programs to generate the following patterns using iteration(loop) statements: [15]

(a)

* #

* # *

* # * #

* # * # *

(b) To display the following pattern:

5 4 3 2 1

5 4 3 2

5 4 3

5 4

Ans: -

(a)

class Pattern1 {

public static void main() {

for (int i = 1; i <= 5; i++) {

for (int j = 1; j <= i; j++) {

if (j % n == 1)

System.out.print("* ");

else

System.out.print("# ");

}

System.out.println();

}

(b)

class Pattern2 {

public static void main()

{

int i, j;

for(i=1; i<=5; i++)

{

for(j=5; j>=i; j--)

System.out.print(j);

System.out.println();

}

Question 6:

Write a program in to input and store all roll numbers, names and marks in 3 subjects of n number of students in five single dimensional arrays and display the remark based on average marks as given below: [15]

Average marks = total marks / 3

Average Marks	Remarks
85 – 100	EXCELLENT
75 – 84	DISTINCTION
60 – 74	FIRST CLASS
40 – 59	PASS
LESS THAN 40	POOR

Ans:

import java.util.Scanner; public class Marks {

public static void main() {

Scanner sc = new Scanner(System.in);

System.out.print("Enter number of students: ");

int n = sc.nextInt();

int[] rollNumbers = new int[n];

String[] names = new String[n];

int[] subject1Marks = new int[n];

int[] subject2Marks = new int[n];

int[] subject3Marks = new int[n];

for (int i = 0; i < n; i++) {

System.out.println("Student " + (i + 1));

System.out.print("Enter roll number: ");

rollNumbers[i] = sc.nextInt();

System.out.print("Enter name: ");

names[i] = sc.nextLine();

System.out.print("Enter marks in subject 1: ");

subject1Marks[i] = sc.nextInt();

System.out.print("Enter marks in subject 2: ");

subject2Marks[i] = sc.nextInt();

System.out.print("Enter marks in subject 3: ");

subject3Marks[i] = sc.nextInt();

}

for (int i = 0; i < n; i++) {

System.out.println("Roll number = " + rollNumbers[i] + ", Name= " + names[i]);

int averageMarks = (subject1Marks[i] + subject2Marks[i] + subject3Marks[i]) / 3;

if (averageMarks >= 85 && averageMarks <= 100) { System.out.println("EXCELLENT");
} else if (averageMarks >= 75 && averageMarks <= 84) { System.out.println("DISTINCTION");
} else if (averageMarks >= 60 && averageMarks <= 74) { System.out.println("FIRST CLASS");
} else if (averageMarks >= 40 && averageMarks <= 59) { System.out.println("PASS");

} else if (averageMarks < 40) {

System.out.println("POOR");

}

Question 7:

Design a class to overload a function Joystring() as follows: [15]

(i) void Joystring(String s, char ch1, char ch2) with one string and two character arguments that replaces the character argument ch1 with the character argument ch2 in the given string s and prints the new string

Example:

Input value of s = "TECHNALAGY"

ch1 = 'A'

ch2 = 'O'

Output : "TECHNOLOGY"

(ii) void Joystring(String s) with one string argument that prints the position of the first space and the last space of the given String s.

Example:

Input value of s = "Cloud computing means Internet based computing"

First Index: 5

Last Index: 36

(iii) void Joystring(String s1, String s2) with two string arguments that combines the two strings with a space between them and prints the resultant string

Example:

Input value of s1 = "COMMON WEALTH"

s2 = "GAMES"

Output: COMMON WEALTH GAMES

(use library functions)

Ans:

import java.util.Scanner;

class StringOperations {

public void Joystring(String s, char ch1, char ch2) { String output = s.replace(ch1, ch2); System.out.println("Output = " + output);

}

public void Joystring(String s) {

int firstIndexOfSpace = s.indexOf(' '); int lastIndexOfSpace = s.lastIndexOf(' ');

System.out.println("First index of space = " + firstIndexOfSpace); System.out.println("Last index of space = " + lastIndexOfSpace);

}

public void Joystring(String s1, String s2) {

String output = s1.concat(" ").concat(s2); System.out.println("Output = " + output);

}

Question 8:

Write a program to input twenty names in an array. Arrange these names in descending order of alphabets , using the bubble sort technique. [15]

Ans:

import java.util.Scanner;

public class SortNames {

public static void main() {

Scanner sc = new Scanner(System.in);

String[] names = new String[20];

System.out.println("Enter 20 names");

for (int i = 0; i < 20; i++)

names[i] = sc.nextLine();

for (int i = 0; i < names.length; i++) {

for (int j = 1; j < (names.length - i); j++) {

if (names[j - 1].compareTo(names[j]) > 0) {

String temp = names[j - 1];

names[j - 1] = names[j];

names[j] = temp;

}

System.out.println("Sorted names: ");

for (int i = 0; i < names.length; i++)

System.out.println(names[i]);

}

Question 9:

Use switch statement, write a menu driven program to: [15]

(i) To find and display all the factors of a number input by the user (including 1 and excluding number itself.)

Example:

Sample Input: n = 15

Sample Output: 1, 3, 5

(ii) To find and display the factorial of a number input by the user. The factorial of a non-negative integer n, denoted by n!, is the product of all integers less than or equal to n.

Example:

Sample Input: n = 5

Sample Output: 120

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

Ans: -

import java.util.*;

public class Menu

{

public static void main()

{

Scanner sc = new Scanner(System.in);

System.out.println("1. Factors");

System.out.println("2. Factorial");

System.out.print("Enter your choice: ");

int ch = sc.nextInt();

switch(ch){

case 1:

System.out.print("Enter n: ");

int n = sc.nextInt();

for (int i = 1; i < n; i++) {

if (n % i == 0)

System.out.println(i);

}

break;

case 2:

System.out.print("Enter n: ");

int n = sc.nextInt();

int factorial = 1;

for (int i = 1; i < n; i++)

factorial = factorial * i;

System.out.println("Factorial: " + factorial);

break;

default:

System.out.println("Invalid choice");

}

Author

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