Q: Question 5Write a program to accept a number and check and display whether it is a spy number or not. (A number is spy if the sum of its digits equals the product of its digits.)Example: consider the number 1124.Sum of the digits = 1 + 1 + 2 + 4 = 8Product of the digits = 1 x 1 x 2 x 4 = 8

import java.util.Scanner; public class KboatSpyNumber { public static void main(String args[]) { Scanner in = new Scanner(System.in); System.out.print("Enter Number: "); int num = in.nextInt(); int digit, sum = 0; int orgNum = num; int prod = 1; while (num > 0) { digit = num % 10; sum += digit; prod *= digit; num /= 10; } if (sum == prod) System.out.println(orgNum + " is Spy Number"); else System.out.println(orgNum + " is not Spy Number"); } }Output

Q: Question 7Write a program to input integer elements into an array of size 20 and perform the following operations:Display largest number from the array.Display smallest number from the array.Display sum of all the elements of the array

import java.util.Scanner; public class KboatSDAMinMaxSum { public static void main(String args[]) { Scanner in = new Scanner(System.in); int arr[] = new int[20]; System.out.println("Enter 20 numbers:"); for (int i = 0; i < 20; i++) { arr[i] = in.nextInt(); } int min = arr[0], max = arr[0], sum = 0; for (int i = 0; i < arr.length; i++) { if (arr[i] < min) min = arr[i]; if (arr[i] > max) max = arr[i]; sum += arr[i]; } System.out.println("Largest Number = " + max); System.out.println("Smallest Number = " + min); System.out.println("Sum = " + sum); } }Output

Q: Question 9Write a program to input forty words in an array. Arrange these words in descending order of alphabets, using selection sort technique. Print the sorted array.

import java.util.Scanner; public class KboatSelectionSort { public static void main(String args[]) { Scanner in = new Scanner(System.in); String a[] = new String[40]; int n = a.length; System.out.println("Enter 40 Names: "); for (int i = 0; i < n; i++) { a[i] = in.nextLine(); } for (int i = 0; i < n - 1; i++) { int idx = i; for (int j = i + 1; j < n; j++) { if (a[j].compareToIgnoreCase(a[idx]) < 0) { idx = j; } } String t = a[idx]; a[idx] = a[i]; a[i] = t; } System.out.println("Sorted Names"); for (int i = 0; i < n; i++) { System.out.println(a[i]); } } }Output

Question 1

Question 4Define a class ElectricBill with the following specifications:class : ElectricBillInstance variables / data member:String n — to store the name of the customerint units — to store the number of units consumeddouble bill — to store the amount to be paidMember methods:void accept( ) — to accept the name of the customer and number of units consumedvoid calculate( ) — to calculate the bill as per the following tariff:Number of unitsRate per unitFirst 100 unitsRs.2.00Next 200 unitsRs.3.00Above 300 unitsRs.5.00A surcharge of 2.5% charged if the number of units consumed is above 300 units.void print( ) — To print the details as follows:Name of the customer: ………………………Number of units consumed: ………………………Bill amount: ………………………Write a main method to create an object of the class and call the above member methods.

Accepted Answer

import java.util.Scanner;

public class ElectricBill
{
    private String n;
    private int units;
    private double bill;
    
    public void accept() {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter customer name: ");
        n = in.nextLine();
        System.out.print("Enter units consumed: ");
        units = in.nextInt();
    }
    
    public void calculate() {
        if (units <= 100)
            bill = units * 2;
        else if (units <= 300)
            bill = 200 + (units - 100) * 3;
        else {
            double amt = 200 + 600 + (units - 300) * 5;
            double surcharge = (amt * 2.5) / 100.0;
            bill = amt + surcharge;
        }
    }
    
    public void print() {
        System.out.println("Name of the customer		: " + n);
        System.out.println("Number of units consumed	: " + units);
        System.out.println("Bill amount			: " + bill);
    }
    
    public static void main(String args[]) {
        ElectricBill obj = new ElectricBill();
        obj.accept();
        obj.calculate();
        obj.print();
    }
}Output

Question 2

Question 5Write a program to accept a number and check and display whether it is a spy number or not. (A number is spy if the sum of its digits equals the product of its digits.)Example: consider the number 1124.Sum of the digits = 1 + 1 + 2 + 4 = 8Product of the digits = 1 x 1 x 2 x 4 = 8

Accepted Answer

import java.util.Scanner;

public class KboatSpyNumber
{
    public static void main(String args[]) {
        
        Scanner in = new Scanner(System.in);
        
        System.out.print("Enter Number: ");
        int num = in.nextInt();
        
        int digit, sum = 0;
        int orgNum = num;
        int prod = 1;
        
        while (num > 0) {
            digit = num % 10;
            
            sum += digit;
            prod *= digit;
            num /= 10;
        }
        
        if (sum == prod)
            System.out.println(orgNum + " is Spy Number");
        else
            System.out.println(orgNum + " is not Spy Number");
        
    }
}Output

Question 3

Question 6Using switch statement, write a menu driven program for the following:To find and display the sum of the series given below:S = x1 - x2 + x3 - x4 + x5 .......... - x20(where x = 2)To display the following series:1 11 111 1111 11111For an incorrect option, an appropriate error message should be displayed.

Accepted Answer

import java.util.Scanner;

public class KboatSeriesMenu
{
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        System.out.println("1. Sum of the series");
        System.out.println("2. Display series");
        System.out.print("Enter your choice: ");
        int choice = in.nextInt();

switch (choice) {
            case 1:
            int sum = 0;
            for (int i = 1; i <= 20; i++) {
                int x = 2;
                int term = (int)Math.pow(x, i);
                if (i % 2 == 0)
                    sum -= term;
                else
                    sum += term;
            }
            System.out.println("Sum=" + sum);
            break;
            
            case 2:
            int term = 1;
            for (int i = 1; i <= 5; i++) {
                System.out.print(term + " ");
                term = term * 10 + 1;
            }
            break;
            
            default:
            System.out.println("Incorrect Choice");
            break;
        }
    }
}Output

Question 4

Question 7Write a program to input integer elements into an array of size 20 and perform the following operations:Display largest number from the array.Display smallest number from the array.Display sum of all the elements of the array

Accepted Answer

import java.util.Scanner;

public class KboatSDAMinMaxSum
{
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        int arr[] = new int[20];
        System.out.println("Enter 20 numbers:");
        for (int i = 0; i < 20; i++) {
            arr[i] = in.nextInt();
        }
        int min = arr[0], max = arr[0], sum = 0;
        for (int i = 0; i < arr.length; i++) {
            if (arr[i] < min)
                min = arr[i];
                
            if (arr[i] > max)
                max = arr[i];
                
            sum += arr[i];
        }
        
        System.out.println("Largest Number = " + max);
        System.out.println("Smallest Number = " + min);
        System.out.println("Sum = " + sum);
    }
}Output

Question 5

Question 8Design a class to overload a function check( ) as follows:void check (String str , char ch ) — to find and print the frequency of a character in a string.Example:Input:str = "success"ch = 's'Output:number of s present is = 3void check(String s1) — to display only vowels from string s1, after converting it to lower case.Example:Input:s1 ="computer"Output : o u e

Accepted Answer

public class KboatOverload
{
    void check (String str , char ch ) {
        int count = 0;
        int len = str.length();
        for (int i = 0; i < str.length(); i++) {
            char c = str.charAt(i);
            if (ch == c) {
                count++;
            }
        }
        System.out.println("Frequency of " + ch + " = " + count);
    }
    
    void check(String s1) {
        String s2 = s1.toLowerCase();
        int len = s2.length();
        System.out.println("Vowels:");
        for (int i = 0; i < len; i++) {
            char ch = s2.charAt(i);
            if (ch == 'a' ||
                ch == 'e' ||
                ch == 'i' ||
                ch == 'o' ||
                ch == 'u')
                System.out.print(ch + " ");
        }
    }
}Output

Question 6

Question 9Write a program to input forty words in an array. Arrange these words in descending order of alphabets, using selection sort technique. Print the sorted array.

Accepted Answer

import java.util.Scanner;

public class KboatSelectionSort
{
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        String a[] = new String[40];
        int n = a.length;
        
        System.out.println("Enter 40 Names: ");
        for (int i = 0; i < n; i++) {
            a[i] = in.nextLine();
        }
        
        for (int i = 0; i < n - 1; i++) {
            int idx = i;
            for (int j = i + 1; j < n; j++) {
                if (a[j].compareToIgnoreCase(a[idx]) < 0) {
                    idx = j;
                }
            }
            String t = a[idx];
            a[idx] = a[i];
            a[i] = t;
        }
        
        System.out.println("Sorted Names");
        for (int i = 0; i < n; i++) {
            System.out.println(a[i]);
        }
    }
}Output

Solved 2017 Question Paper ICSE Class 10 Computer Applications