Q: Question 9Write a program to input a sentence. Count and display the frequency of each letter of the sentence in alphabetical order.Sample Input: COMPUTER APPLICATIONSSample Output:CharacterFrequencyCharacterFrequencyA2O2C2P3I1R1L2S1M1T2N1U1

import java.util.Scanner; public class KboatLetterFreq { public static void main(String args[]) { Scanner in = new Scanner(System.in); System.out.println("Enter a sentence:"); String str = in.nextLine(); str = str.toUpperCase(); int freqMap[] = new int[26]; int len = str.length(); for (int i = 0; i < len; i++) { char ch = str.charAt(i); if (Character.isLetter(ch)) { int chIdx = ch - 65; freqMap[chIdx]++; } } System.out.println("Character\tFrequency"); for (int i = 0; i < freqMap.length; i++) { if (freqMap[i] > 0) { System.out.println((char)(i + 65) + "\t\t" + freqMap[i]); } } } }Output

Question 1

Question 4Write a program to perform binary search on a list of integers given below, to search for an element input by the user. If it is found display the element along with its position, otherwise display the message "Search element not found".5, 7, 9, 11, 15, 20, 30, 45, 89, 97

Accepted Answer

import java.util.Scanner;

public class KboatBinarySearch
{
    public static void main(String args[]) {
        
        Scanner in = new Scanner(System.in);
        int arr[] = {5, 7, 9, 11, 15, 20, 30, 45, 89, 97};
        
        System.out.print("Enter number to search: ");
        int n = in.nextInt();
        
        int l = 0, h = arr.length - 1, index = -1;
        while (l <= h) {
            int m = (l + h) / 2;
            if (arr[m] < n)
                l = m + 1;
            else if (arr[m] > n)
                h = m - 1;
            else {
                index = m;
                break;
            }
                
        }
        
        if (index == -1) {
            System.out.println("Search element not found");
        }
        else {
            System.out.println(n + " found at position " + index);
        }
    }
}Output

Question 2

Question 5Define a class Student as given below:Data members/instance variables:name, age, m1, m2, m3 (marks in 3 subjects), maximum, averageMember methods:A parameterized constructor to initialize the data members.To accept the details of a student.To compute the average and the maximum out of three marks.To display the name, age, marks in three subjects, maximum and average.Write a main method to create an object of a class and call the above member methods.

Accepted Answer

import java.util.Scanner;

public class Student
{
    private String name;
    private int age;
    private int m1;
    private int m2;
    private int m3;
    private int maximum;
    private double average;

public Student(String n, int a, int s1, 
    int s2, int s3) {
        name = n;
        age = a;
        m1 = s1;
        m2 = s2;
        m3 = s3;
    }

public Student() {
        name = "";
        age = 0;
        m1 = 0;
        m2 = 0;
        m3 = 0;
        maximum = 0;
        average = 0;
    }

public void accept() {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter name: ");
        name = in.nextLine();
        System.out.print("Enter age: ");
        age = in.nextInt();
        System.out.print("Enter Subject 1 Marks: ");
        m1 = in.nextInt();
        System.out.print("Enter Subject 2 Marks: ");
        m2 = in.nextInt();
        System.out.print("Enter Subject 3 Marks: ");
        m3 = in.nextInt();
    }

public void compute() {
        if (m1 > m2 && m1 > m3)
            maximum = m1;
        else if (m2 > m1 && m2 > m3)
            maximum = m2;
        else
            maximum = m3;

average = (m1 + m2 + m3) / 3.0;
    }

public void display() {
        System.out.println("Name: " + name);
        System.out.println("Age: " + age);
        System.out.println("Subject 1 Marks: " + m1);
        System.out.println("Subject 2 Marks: " + m2);
        System.out.println("Subject 3 Marks: " + m3);
        System.out.println("Maximum Marks: " + maximum);
        System.out.println("Average Marks: " + average);
    }

public static void main(String args[]) {
        Student obj = new Student();
        obj.accept();
        obj.compute();
        obj.display();
    }
}Output

Question 3

Question 6Shasha Travels Pvt. Ltd. gives the following discount to its customers:Ticket AmountDiscountAbove Rs. 7000018%Rs. 55001 to Rs. 7000016%Rs. 35001 to Rs. 5500012%Rs. 25001 to Rs. 3500010%Less than Rs. 250012%Write a program to input the name and ticket amount for the customer and calculate the discount amount and net amount to be paid. Display the output in the following format for each customer:Sl. No.     Name    Ticket Charges     Discount      Net Amount
(Assume that there are 15 customers, first customer is given the serial no (SI. No.) 1, next customer 2 …….. and so on)

Accepted Answer

import java.util.Scanner; public class KboatShashaTravels { public static void main(String args[]) { Scanner in = new Scanner(System.in); String names[] = new String[15]; int amounts[] = new int[15]; for (int i = 0; i < 15; i++) { System.out.print("Enter " + "Customer " + (i+1) + " Name: "); names[i] = in.nextLine(); System.out.print("Enter " + "Customer " + (i+1) + " Ticket Charges: "); amounts[i] = in.nextInt(); in.nextLine(); } System.out.println("Sl. No. Name Ticket Charges Discount Net Amount"); for (int i = 0; i < 15; i++) { int dp = 0; int amt = amounts[i]; if (amt > 70000) dp = 18; else if (amt >= 55001) dp = 16; else if (amt >= 35001) dp = 12; else if (amt >= 25001) dp = 10; else dp = 2; double disc = amt * dp / 100.0; double net = amt - disc; System.out.println((i+1) + " " + names[i] + " " + amounts[i] + " " + disc + " " + net); } } }Output

Question 4

Question 7Write a menu driven program to accept a number from the user and check whether it is a Prime number or an Automorphic number.(a) Prime number: (A number is said to be prime, if it is only divisible by 1 and itself)Example: 3,5,7,11(b) Automorphic number: (Automorphic number is the number which is contained in the last digit(s) of its square.)Example: 25 is an Automorphic number as its square is 625 and 25 is present as the last two digits.

Accepted Answer

import java.util.Scanner;

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

switch (choice) {
            case 1:
            int c = 0;
            for (int i = 1; i <= num; i++) {
                if (num % i == 0) {
                    c++;
                }
            }
            if (c == 2) 
                System.out.println(num + " is Prime");
            else
                System.out.println(num + " is not Prime");
            break;

case 2:
            int numCopy = num;
            int sq = num * num;
            int d = 0;

/*
             * Count the number of 
             * digits in num
             */
            while(num > 0) {
                d++;
                num /= 10;
            }

/*
             * Extract the last d digits
             * from square of num
             */
            int ld = (int)(sq % Math.pow(10, d));

if (ld == numCopy)
                System.out.println(numCopy + " is automorphic");
            else
                System.out.println(numCopy + " is not automorphic");
            break;

default:
            System.out.println("Incorrect Choice");
            break;
        }
    }
}Output

Question 5

Question 8Write a program to store 6 elements in an array P and 4 elements in an array Q. Now, produce a third array R, containing all the elements of array P and Q. Display the resultant array.InputInputOutputP[ ]Q[ ]R[ ]419462361712823 310 10  19  23  7  8

Accepted Answer

import java.util.Scanner;

public class Kboat3Arrays
{
    public static void main(String args[]) {
        
        Scanner in = new Scanner(System.in);
        
        int P[] = new int[6];
        int Q[] = new int[4];
        int R[] = new int[10];
        int i = 0;
        
        System.out.println("Enter 6 elements of array P:");
        for (i = 0; i < P.length; i++) {
            P[i] = in.nextInt();
        }
        
        System.out.println("Enter 4 elements of array Q:");
        for (i = 0; i < Q.length; i++) {
            Q[i] = in.nextInt();
        }
        
        i = 0;
        while(i < P.length) {
            R[i] = P[i];
            i++;
        }
        
        int j = 0;
        while(j < Q.length) {
            R[i++] = Q[j++];
        }
        
        System.out.println("Elements of Array R:");
        for (i = 0; i < R.length; i++) {
            System.out.print(R[i] + " ");
        }
    }
}Output

Question 6

Question 9Write a program to input a sentence. Count and display the frequency of each letter of the sentence in alphabetical order.Sample Input: COMPUTER APPLICATIONSSample Output:CharacterFrequencyCharacterFrequencyA2O2C2P3I1R1L2S1M1T2N1U1

Accepted Answer

import java.util.Scanner;

public class KboatLetterFreq
{
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        System.out.println("Enter a sentence:");
        String str = in.nextLine();
        str = str.toUpperCase();
        int freqMap[] = new int[26];
        int len = str.length();
        
        for (int i = 0; i < len; i++) {
            char ch = str.charAt(i);
            if (Character.isLetter(ch)) {
                int chIdx = ch - 65;
                freqMap[chIdx]++;
            }
        }
        
        System.out.println("Character	Frequency");
        for (int i = 0; i < freqMap.length; i++) {
            if (freqMap[i] > 0) {
                System.out.println((char)(i + 65) 
                            + "		" + freqMap[i]);
            }
        }
    }
}Output

Solved 2010 Question Paper ICSE Class 10 Computer Applications