Class as the Basis of All Computation

class Discount 
( 
    int pr; double d, amt; String nm; 
    Scanner ob = ...?1?... Scanner(System.in); 
    void input( )   {
        System.out.println("Enter customer's name:"); 
        nm = ...?2?... ;
        System.out.println("Enter price of the article:"); 
        pr = ob.nextInt( ); 
    } 
    void calculate()    {
        if (...?3?...)  
            d= ...?4?... ;
        else 
            d = 0;
        amt = pr - d;
    } 
    void print()    {
        System.out.println("Name =" + nm); 
        System.out.println("Amount to be paid=" + amt); 
    }
}

class Discount 
( 
    int pr; double d, amt; String nm; 
    Scanner ob = new Scanner(System.in); 
    void input( )   {
        System.out.println("Enter customer's name:"); 
        nm = ob.nextLine();
        System.out.println("Enter price of the article:"); 
        pr = ob.nextInt( ); 
    } 
    void calculate()    {
        if (pr > 10000)  
            d= 12.0 / 100.0 * pr;
        else 
            d = 0;
        amt = pr - d;
    } 
    void print()    {
        System.out.println("Name =" + nm); 
        System.out.println("Amount to be paid=" + amt); 
    }
}

public class Example {
    //Class definition
}

class Cuboid {
    private double height;
    private double width;
    private double depth;
    private double volume;

    public void input(int h, int w, int d) {
        height = h;
        width = w;
        depth = d;
    }

    public void computeVolume() {
        volume = height * width * depth;
        System.out.println("Volume = " + volume);
    }
}

import java.util.Scanner;

public class Calculate
{
    private int a;
    private int b;
    private int sum;
    private int diff;

    public void inputdata() {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter first number: ");
        a = in.nextInt();
        System.out.print("Enter second number: ");
        b = in.nextInt();
    }
    
    public void calculate() {
        sum = a + b;
        diff = a - b;
    }
    
    public void outputdata() {
        System.out.println("Sum = " + sum);
        System.out.println("Difference = " + diff);
    }
    
    public static void main(String args[]) {
        Calculate obj = new Calculate();
        obj.inputdata();
        obj.calculate();
        obj.outputdata();
    }
}

import java.util.Scanner;

public class Triplet
{
    private int a;
    private int b;
    private int c;
    
    public void getdata() {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter a: ");
        a = in.nextInt();
        System.out.print("Enter b: ");
        b = in.nextInt();
        System.out.print("Enter c: ");
        c = in.nextInt();
    }
    
    public void findprint() {
        if ((Math.pow(a, 2) + Math.pow(b, 2)) == Math.pow(c, 2)
                || (Math.pow(b, 2) + Math.pow(c, 2)) == Math.pow(a, 2)
                || (Math.pow(a, 2) + Math.pow(c, 2)) == Math.pow(b, 2))
            System.out.print("Numbers are Pythagorean Triplets");
        else
            System.out.print("Numbers are not Pythagorean Triplets");
    }
    
    public static void main(String args[]) {
        Triplet obj = new Triplet();
        obj.getdata();
        obj.findprint();
    }
}

Pan Number  Name    Tax-Income  Tax
..........  ....    ..........  ...
..........  ....    ..........  ...

import java.util.Scanner;

public class Employee
{
    private int pan;
    private String name;
    private double taxincome;
    private double tax;
    
    public void input() {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter pan number: ");
        pan = in.nextInt();
        in.nextLine();
        System.out.print("Enter Name: ");
        name = in.nextLine();
        System.out.print("Enter taxable income: ");
        taxincome = in.nextDouble();
    }
    
    public void cal() {
        if (taxincome <= 250000)
            tax = 0;
        else if (taxincome <= 500000)
            tax = (taxincome - 250000) * 0.1;
        else if (taxincome <= 1000000)
            tax = 30000 + ((taxincome - 500000) * 0.2);
        else
            tax = 50000 + ((taxincome - 1000000) * 0.3);
    }
    
    public void display() {
        System.out.println("Pan Number\tName\tTax-Income\tTax");
        System.out.println(pan + "\t" + name + "\t" 
            + taxincome + "\t" + tax);
    }
    
    public static void main(String args[]) {
        Employee obj = new Employee();
        obj.input();
        obj.cal();
        obj.display();
    }
}

Name of the customer  Discount    Amount to be paid
....................  ........    .................
....................  ........    .................

import java.util.Scanner;

public class Discount
{
    private int cost;
    private String name;
    private double dc;
    private double amt;
    
    public void input() {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter customer name: ");
        name = in.nextLine();
        System.out.print("Enter article cost: ");
        cost = in.nextInt();
    }
    
    public void cal() {
        if (cost <= 5000)
            dc = 0;
        else if (cost <= 10000)
            dc = cost * 0.1;
        else if (cost <= 15000)
            dc = cost * 0.15;
        else
            dc = cost * 0.2;
            
        amt = cost - dc;
    }
    
    public void display() {
        System.out.println("Name of the customer\tDiscount\tAmount to be paid");
        System.out.println(name + "\t" + dc + "\t" + amt);   
    }
    
    public static void main(String args[]) {
        Discount obj = new Discount();
        obj.input();
        obj.cal();
        obj.display();
    }
}

Name of the customer    Calls made  Amount to be paid
....................    ..........  .................
....................    ..........  .................

import java.util.Scanner;

public class Telephone
{
    private int prv;
    private int pre;
    private int call;
    private String name;
    private double amt;
    private double total;
    
    public void input() {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter Customer Name: ");
        name = in.nextLine();
        System.out.print("Enter previous reading: ");
        prv = in.nextInt();
        System.out.print("Enter present reading: ");
        pre = in.nextInt();
    }
    
    public void cal() {
        call = pre - prv;
        if (call <= 100)
            amt = 0;
        else if (call <= 200)
            amt = (call - 100) * 0.9;
        else if (call <= 400)
            amt = (100 * 0.9) + (call - 200) * 0.8;
        else
            amt = (100 * 0.9) + (200 * 0.8) + ((call - 400) * 0.7);
            
        total = amt + 180;
    }
    
    public void display() {
        System.out.println("Name of the customer\tCalls made\tAmount to be paid");
        System.out.println(name + "\t" + call + "\t" + total);
    }
    
    public static void main(String args[]) {
        Telephone obj = new Telephone();
        obj.input();
        obj.cal();
        obj.display();
    }
}

import java.util.Scanner;

public class Interest
{
    private int p;
    private float r;
    private int t;
    private double interest;
    private double amt;
    
    public void input() {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter principal: ");
        p = in.nextInt();
        System.out.print("Enter time: ");
        t = in.nextInt();
    }
    
    public void cal() {
        if (t == 1)
            r = 6.5f;
        else if (t == 2)
            r = 7.5f;
        else if (t == 3)
            r = 8.5f;
        else
            r = 9.5f;
            
        interest = (p * r * t) / 100.0;
        amt = p + interest;
    }
    
    public void display() {
        System.out.println("Principal: " + p);
        System.out.println("Interest: " + interest);
        System.out.println("Amount Payable: " + amt);
    }
    
    public static void main(String args[]) {
        Interest obj = new Interest();
        obj.input();
        obj.cal();
        obj.display();
    }
}

import java.util.Scanner;

public class Library
{
    private String name;
    private int price;
    private int day;
    private double fine;
    
    public void input() {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter name of the book: ");
        name = in.nextLine();
        System.out.print("Enter printed price of the book: ");
        price = in.nextInt();
        System.out.print("For how many days fine needs to be paid: ");
        day = in.nextInt();
    }
    
    public void cal() {
        if (day <= 7)
            fine = day * 0.25;
        else if (day <= 15)
            fine = (7 * 0.25) + ((day - 7) * 0.4);
        else if (day <= 30)
            fine = (7 * 0.25) + (8 * 0.4) + ((day - 15) * 0.6);
        else
            fine = (7 * 0.25) + (8 * 0.4) + (15 * 0.6) + ((day - 30) * 0.8);
    }
    
    public void display() {
        System.out.println("Name of the book: " + name);
        System.out.println("Fine to be paid: " + fine);
    }
    
    public static void main(String args[]) {
        Library obj = new Library();
        obj.input();
        obj.cal();
        obj.display();
    }
}

import java.util.Scanner;

public class Loan
{
    private int time;
    private double principal;
    private double rate;
    private double interest;
    private double amt;
    
    public void getdata() {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter principal: ");
        principal = in.nextInt();
        System.out.print("Enter time: ");
        time = in.nextInt();
    }
    
    public void calculate() {
        if (time <= 5)
            rate = 15.0;
        else if (time <= 10)
            rate = 12.0;
        else
            rate = 10.0;
            
        interest = (principal * rate * time) / 100.0;
        amt = principal + interest;
    }
    
    public void display() {
        System.out.println("Interest = " + interest);
        System.out.println("Amount Payable = " + amt);
    }
    
    public static void main(String args[]) {
        Loan obj = new Loan();
        obj.getdata();
        obj.calculate();
        obj.display();
    }
}

import java.util.Scanner;

public class Honda
{
    private int type;
    private int cost;
    private double newCost;
    
    public void gettype() {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter type: ");
        type = in.nextInt();
        System.out.print("Enter cost: ");
        cost = in.nextInt();
    }
    
    public void find() {
        switch (type) {
            case 2:
            newCost = cost + (cost * 0.1);
            break;
            
            case 4:
            newCost = cost + (cost * 0.12);
            break;
            
            default:
            System.out.println("Incorrect type");
            break;
        }
    }
    
    public void printcost() {
        System.out.println("Type: " + type);
        System.out.println("New cost: " + newCost);
    }
    
    public static void main(String args[]) {
        Honda obj = new Honda();
        obj.gettype();
        obj.find();
        obj.printcost();
    }
}

Bike No.    Phone No.   Name    No. of days     Charge       
xxxxxxx     xxxxxxxx    xxxx        xxx         xxxxxx       

import java.util.Scanner;

public class Mobike
{
    private int bno;
    private int phno;
    private int days;
    private int charge;
    private String name;
    
    public void input() {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter Customer Name: ");
        name = in.nextLine();
        System.out.print("Enter Customer Phone Number: ");
        phno = in.nextInt();
        System.out.print("Enter Bike Number: ");
        bno = in.nextInt();
        System.out.print("Enter Number of Days: ");
        days = in.nextInt();
    }
    
    public void compute() {
        if (days <= 5)
            charge = days * 500;
        else if (days <= 10)
            charge = (5 * 500) + ((days - 5) * 400);
        else
            charge = (5 * 500) + (5 * 400) + ((days - 10) * 200);
    }
    
    public void display() {
        System.out.println("Bike No.\tPhone No.\tName\tNo. of days \tCharge");
        System.out.println(bno + "\t" + phno + "\t" + name + "\t" + days 
            + "\t" + charge);
    }
    
    public static void main(String args[]) {
        Mobike obj = new Mobike();
        obj.input();
        obj.compute();
        obj.display();
    }
}

import java.util.Scanner;

public class Caseconvert
{
    private String str;
    private String convStr;
    
    public void getstr() {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter the string: ");
        str = in.nextLine();
    }
    
    public void convert() {
        char arr[] = new char[str.length()];
        for (int i = 0; i < str.length(); i++) {
            if (Character.isUpperCase(str.charAt(i)))
                arr[i] = Character.toLowerCase(str.charAt(i));
            else if (Character.isLowerCase(str.charAt(i)))
                arr[i] = Character.toUpperCase(str.charAt(i));
            else
                arr[i] = str.charAt(i);
        }
        convStr = new String(arr);
    }
    
    public void display() {
        System.out.println("Converted String:");
        System.out.println(convStr);
    }
    
    public static void main(String args[]) {
        Caseconvert obj = new Caseconvert();
        obj.getstr();
        obj.convert();
        obj.display();
    }
}

import java.util.Scanner;

public class Vowel
{
    private String s;
    private int c;
    
    public void getstr() {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter the string: ");
        s = in.nextLine();
    }
    
    public void getvowel() {
        String temp = s.toUpperCase();
        c = 0;
        for (int i = 0; i < temp.length(); i++) {
            char ch = temp.charAt(i);
            if (ch == 'A' || ch == 'E' || ch == 'I' || ch == 'O'
             || ch == 'U')
                c++;
        }
    }
    
    public void display() {
        System.out.println("No. of Vowels = " + c);
    }
    
    public static void main(String args[]) {
        Vowel obj = new Vowel();
        obj.getstr();
        obj.getvowel();
        obj.display();
    }
}

import java.util.Scanner;

public class Stock
{
    private String title;
    private String author;
    private String pub;
    private int noc;
    
    public void getdata() {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter book title: ");
        title = in.nextLine();
        System.out.print("Enter book author: ");
        author = in.nextLine();
        System.out.print("Enter book publisher: ");
        pub = in.nextLine();
        System.out.print("Enter no. of copies: ");
        noc = in.nextInt();
    }
    
    public void purchase(String t, String a, String p, int n) {
        if (title.equalsIgnoreCase(t) &&
            author.equalsIgnoreCase(a) &&
            pub.equalsIgnoreCase(p)) {
                if (noc > n) {
                    noc -= n;
                    System.out.println("Updated noc = " + noc);
                }
                else {
                    System.out.println("Stock is under flowing");
                }
        }
        else {
            System.out.println("Book is not available");
        }
    }
    
    public static void main(String args[]) {
        Stock obj = new Stock();
        obj.getdata();
        obj.purchase("wings of fire", "APJ Abdul Kalam",
            "universities press", 10);
        obj.purchase("Ignited Minds", "APJ Abdul Kalam",
            "Penguin", 5);
        obj.purchase("wings of fire", "APJ Abdul Kalam",
            "universities press", 20);
    }
}

import java.util.Scanner;

public class Characters
{
    private String str;
    
    public void input(String st) {
        str = st;
    }
    
    public void check_print() {
        int cLetters = 0, cDigits = 0, cUpper = 0, cLower = 0,
            cSpecial = 0;
            
        for (int i = 0; i < str.length(); i++) {
            char ch = str.charAt(i);
            if (ch >= 'A' && ch <= 'Z') {
                cLetters++;
                cUpper++;
            }
            else if (ch >= 'a' && ch <= 'z') {
                cLetters++;
                cLower++;
            }
            else if (ch >= '0' && ch <= '9') {
                cDigits++;
            }
            else if (!Character.isWhitespace(ch)) {
                cSpecial++;
            }
        }
        
        System.out.println("Number of Letters: " + cLetters);
        System.out.println("Number of Digits: " + cDigits);
        System.out.println("Number of Upppercase Characters: " 
            + cUpper);
        System.out.println("Number of Lowercase Characters: " 
            + cLower);
        System.out.println("Number of Special Characters: " 
            + cSpecial);
    }
    
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter the string: ");
        String s = in.nextLine();
        Characters obj = new Characters();
        obj.input(s);
        obj.check_print();
    }
}

import java.util.Scanner;

public class Student
{
    private String name;
    private int eng;
    private int hn;
    private int mts;
    private double total;
    private double avg;
    
    public void accept() {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter student name: ");
        name = in.nextLine();
        System.out.print("Enter marks in English: ");
        eng = in.nextInt();
        System.out.print("Enter marks in Hindi: ");
        hn = in.nextInt();
        System.out.print("Enter marks in Maths: ");
        mts = in.nextInt();
    }
    
    public void compute() {
        total = eng + hn + mts;
        avg = total / 3.0;
    }
    
    public void display() {
        System.out.println("Name: " + name);
        System.out.println("Marks in English: " + eng);
        System.out.println("Marks in Hindi: " + hn);
        System.out.println("Marks in Maths: " + mts);
        System.out.println("Total Marks: " + total);
        System.out.println("Average Marks: " + avg);
    }
    
    public static void main(String args[]) {
        Student obj = new Student();
        obj.accept();
        obj.compute();
        obj.display();
    }
}

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();
    }
}

import java.util.Scanner;

public class RailwayTicket
{
    private String name;
    private String coach;
    private long mobno;
    private int amt;
    private int totalamt;
    
    private void accept() {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter name: ");
        name = in.nextLine();
        System.out.print("Enter coach: ");
        coach = in.nextLine();
        System.out.print("Enter mobile no: ");
        mobno = in.nextLong();
        System.out.print("Enter amount: ");
        amt = in.nextInt();
    }
    
    private void update() {
        if(coach.equalsIgnoreCase("First_AC"))
            totalamt = amt + 700;
        else if(coach.equalsIgnoreCase("Second_AC"))
            totalamt = amt + 500;
        else if(coach.equalsIgnoreCase("Third_AC"))
            totalamt = amt + 250;
        else if(coach.equalsIgnoreCase("Sleeper"))
            totalamt = amt;
    }
    
    private void display() {
        System.out.println("Name: " + name);
        System.out.println("Coach: " + coach);
        System.out.println("Total Amount: " + totalamt);
        System.out.println("Mobile number: " + mobno);
    }
    
    public static void main(String args[]) {
        RailwayTicket obj = new RailwayTicket();
        obj.accept();
        obj.update();
        obj.display();
    }
}