ICSE 2019 computer application solved paper


ICSE 2019 computer application solved paper


ICSE Question Paper – 2019 Computer Applications Class X

SECTION A (40 Marks)
Answer all questions from this Section

SECTION A (40 MARKS)
Attempt all questions


Question 1

(a) Name any two basic principles of Object-oriented programming.

Answer:
  • Encapsulation
  • Abstraction
(b) Write a difference between unary and binary operators.
Answer
A binary operator requires two operands whereas the Unary operator requires one operand. Example 10+5 the plus sign between 10 and 5 is a binary operator which requires two operands. But if we write -10 +10 here minus or plus sign 10 is a unary operator.  

(c) Name the keyword:

(i) indicates that a method has no return type. (ii) makes the variable as a class variable.
Answer
  1. void
  2. static

(d) Write the memory capacity (storage size) of short and float data types in bytes.

Answer
short storage size 2 bytes 16bits.
float storage size 4 bytes 32 bits

(e) Identify and name the following tokens:(i) public, (ii) ‘a’ , (iii) == , (iv) {}

  1. keyword
  2. a character literal or constant
  3. equality operator
  4. Block
Question 2

(a) Differentiate between if else if and switch statements.

Answer
if-else return a Boolean value (true or false) and it can test for all types of conditions, whereas switch statement, do not return Boolean but it passes int or char value and only tests for equality.

(b) Give the output of the following code:

Answer
String p = "20", q = "19";
int a = Integer.parseInt(p);
int b = Integer.valueOf(q);
System.out.println(a + "" + b);

The output is 2019

(c) What are the various types of errors in Java?

Answer
There are three types of error in java Compile-time error, Runtime error, Logical error

(d) State the data type and value of res after the following is executed:

char ch = '9';
res = Character.isDigit(ch);Answer
The data type and value of res after the following is executed is boolean

(e) What is the difference between the linear search and the binary search technique?

Answer
Linear search take longer time to search as it is Iterative in nature, whereas binary search takes less time to search an element from the sorted list of elements.
In linear search no sorting is required but in Binary search, sorting is required.

SECTION B (60 Marks)
Question 4

Design a class named ShowRoom with the following description:

Instance variables/data members:
String name: to store the name of the customer.
long mobno: to store the mobile number of the customer.
double cost: to store the cost of the items purchased.
double dis: to store the discount amount.
double amount: to store the amount to be paid after a discount.
Member methods:
ShowRoom(): default constructor to initialize data members.
void input(): to input customer name, mobile number, cost.
void calculate(): to calculate the discount on the cost of purchased items, based on the following criteria:
Cost
Discount (in percentage)
Less than or equal to Rs. 10000
5%
More than Rs. 10000 and less than or equal to Rs. 20000
10%
More than Rs. 20000 and less than or equal to Rs. 35000
15%
More than Rs. 35000
20%
void display(): to display customer name, mobile number, amount to be paid after discount.
Write a main() method to create an object of the class and call the above member methods.

Answer

import java.util.Scanner;
class ShowRoom
{
    String name;    // Customer name
    long mobno;     // for mobile number of the customer.
    double cost;    // to store the cost of the items purchased.
    double dis;     // for the cost of the items purchased.
    double amount;  // to store the discount amount.
    ShowRoom()      // default constructor for initialization
    {
        name="";
        mobno=0L;   // L is used for long data type
        cost=0.0;
        dis=0.0;
        amount=0.0;
    }
    // input method for inputing customer details
    void input()
    {
        Scanner kb = new Scanner(System.in);
        System.out.print("Enter your name: ");
        name=kb.nextLine();
        System.out.print("Enter your Mobile Number: ");
        mobno=kb.nextLong();
        System.out.print("Enter cost of item purchased: ");
        cost=kb.nextDouble();
    }
    // this method calculate the discount on the purchased item
    void calculate()
    {
        if(cost<=10000)
        {
            dis = cost * 0.05;
            amount = cost - dis;
        }
        else if(cost>10000&&cost<=20000)
        {
            dis = cost * 0.1;
            amount = cost - dis;
        }
        else if(cost>20000&&cost<=35000)
        {
            dis = cost * 0.15;
            amount = cost - dis;
        }
        else if(cost>35000)
        {
            dis = cost * 0.2;
            amount = cost - dis;
        }
    }
    // This method display the customer
    // name, mobile and amount
    void display()
    {
        System.out.println("Name of the customer: "+name);
        System.out.println("Mobile number : "+mobno);
        System.out.println("Amount to be paid after discount: "+amount);
    }
    // main method
    public static void main(String[]args)
    {
        // Object of ShowRoom
        ShowRoom obj = new ShowRoom();
        obj.input();
        obj.calculate();
        obj.display();
    }
}
Output:
Enter your name: Sunil
Enter your Mobile Number: 9000999099
Enter cost of item purchased: 22000
Name of the customer: Sunil
Mobile number : 9000999099
Amount to be paid after discount: 18700.0

Question 5

Using the switch-case statement, write a menu-driven program to do the following:
(a) To generate and print letters from A to Z and their Unicode.

Letters    Unicode
A          65
B          66
.          .
.          .
.          .
Z          90
(b) Display the following pattern using iteration (looping) statement:
1
1 2
1 2 3
1 2 3 4
1 2 3 4 5
Answer

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
public class MenuDrivenICSE2019
{
    public static void main(String args[])throws IOException
    {
        InputStreamReader in = new InputStreamReader(System.in);
        BufferedReader br = new BufferedReader(in);
        int choice;     // for user choice
        int i, j;       // using for loop
        System.out.println("Press 1 to Unicode of A to Z");
        System.out.println("Press 2 for pattern");
        System.out.print("Enter your choice: ");
        choice = Integer.parseInt(br.readLine());
        switch(choice)
        {
            case 1:
            System.out.println("Letters\tUnicode");
            for(i = 65; i <= 90; i++)
            {
                System.out.println((char)i + "\t" + i);
            }
            break;
            case 2:
            for(i = 1; i <= 5; i++){
                for(j = 1; j <= i; j++){
                    System.out.print(j + " ");
                }
                System.out.println();
            }
            break;
            default:
            System.out.println("Invalid choice!");
        }
    }
}
Output:
Press 1 to Unicode of A to Z
Press 2 for pattern
Enter your choice: 1
Letters            Unicode
A         65
B         66
C         67
D         68
E         69
F          70
G         71
H         72
I           73
J          74
K         75
L          76
M         77
N         78
O         79
P         80
Q         81
R         82
S         83
T          84
U         85
V         86
W        87
X         88
Y         89
Z          90
Press 1 to Unicode of A to Z
Press 2 for pattern
Enter your choice: 2
1
1 2
1 2 3
1 2 3 4
1 2 3 4 5

Question 6
Write a program to input 15 integer elements in an array and sort them in ascending order using the bubble sort technique.


Question 7

Design a class to overload a function series() as follows:
(a) void series(int x, int n): to display the sum of the series given below:
x1 + x2 + x3 + … + xn terms
(b) void series(int p): to display the following series:
0, 7, 26, 63, … p terms.
(c) void series(): to display the sum of the series given below:
1/2 + 1/3 + 1/4 + … + 1/10


Answer

// Overload series methods
public class OverloadICSE2019
{
    long sum1 = 0L;
    int i, num;
    double sum2;
    public void series(int x, int n)
    {
       
        for(i = 1; i <= n; i++)
        {
            sum1 += (long)Math.pow(x, i);
        }
        System.out.println("Sum = " + sum1);
    }
    public void series(int p)
    {
        for( i = 1; i <= p; i++)
        {
             num = i*i*i - 1;
            System.out.print(num + "\t");
        }
    }
    public void series()
    {
        sum2 = 0.0;
        for(i = 2; i <= 10; i++)
            sum2 += 1.0 / i;
        System.out.println("Sum = " + sum2);
    }
}

Question 8

Write a program to input a sentence and convert it into uppercase and count and display the total number of words starting with the letter ‘A’.

Example:
Sample Input: ADVANCEMENT AND APPLICATION OF INFORMATION TECHNOLOGY ARE EVER CHANGING.
Sample Output: Total number of words starting with letter ‘A’ = 4.

Answer
import java.util.*;
public class CountLetterA_ICSE2019
{
    public static void main(String[]args)
    {
        // sc here is the object for Scanner class
        Scanner sc = new Scanner(System.in);
        String sent;    // used for sentence
        int count=0;    // counter for A
        char ch;        // used for character
        System.out.print("Enter a sentence: ");
        sent = sc.nextLine();
        sent = sent.toUpperCase();

        for(int i=0; i<sent.length(); i++)
        {
            ch = sent.charAt(i);
            if(ch =='A')
                count++;
           
        }
        System.out.println("Total number of words Starting with letter 'A'=" + count);
    }
}
Output
Enter a sentence: Have a nice day with a big smile
Total number of words Starting with letter 'A'= 4

Question 9

tech number has an even number of digits. If the number is split in two equal halves, then the square of the sum of these halves is equal to the number itself. Write a program to generate and print all four digits of tech numbers.

Example:
Consider the number 3025.
Square of the sum of the halves of 3025 = (30 + 25)2
= (55)2
= 3025 is a tech number.

Answer
public class TechNumberICSE2019
{
    int firstHalf;      // for the first half
    int secondHalf;     // for the second half
    int sum;            // sum of both half
    int flag;           // flag variable
    // Method to check Tech number
    public int isTechNumber(int num)
    {
        flag = 0;
        firstHalf= num / 100;
        secondHalf = num % 100;
        sum = firstHalf + secondHalf;
        if(num == sum * sum)
        {
            flag = 1;
        }
        return flag;
    }
    // main method
    public static void main(String args[])
    {
        TechNumberICSE2019 ob = new TechNumberICSE2019();
        int i, tech;
        for(i = 1000; i <= 9999; i++)
        {
            tech = ob.isTechNumber(i);
            if(tech == 1)
            {
                System.out.print(i + " , ");
            }
        }
    }
}
Output:
2025 , 3025 , 9801

Java program for Evil Number

Neon number program in java



SHARE THIS
Previous Post
Next Post