OOP Project by safkat sir using function

// Arithmatic Calculation Class

import java.util.Scanner;
public class ArithmeticCalculation {

    long n;
    Scanner sc=new Scanner(System.in);

    public void summation()
    {
        long sum=0;
        boolean ok=true;
        while(ok)
        {
            long x=sc.nextLong();
            sum+=x;
            String c=sc.next();
            if(c.charAt(0) == '=')
            {
                System.out.println(sum);
                break;
            }
        }
    }

    public void substraction()
    {
        long a=0,b=0;
        boolean ok=true;
        int i=0;
        while(ok)
        {
            if(i==0)
            {
                long z=sc.nextLong();
                a+=z;
                i++;
                continue;
            }

            String c=sc.next();
            if(c.charAt(0) == '=')
            {
                System.out.println(a-b);
                break;
            }

            long x=sc.nextLong();
            if(c.charAt(0) == '+')
                a+=x;
            else
                b+=x;
        }
    }

    public void multiplication()
    {
        long a=1;
        boolean ok=true;
        while(ok)
        {
            long x=sc.nextLong();
            a*=x;
            String c=sc.next();
            if(c.charAt(0) == '=')
            {
                System.out.println(a);
                break;
            }
        }
    }

    public void division()
    {
        double a=sc.nextDouble();
        double b=sc.nextDouble();

        if(b==0)
            System.out.println("Cannot divided by zero");
        else
            System.out.println(a/b);
    }

    public void mod()
    {
        long a=sc.nextLong();
        long b=sc.nextLong();
        if(b==0)
            System.out.println("Cannot divided by zero");
        else
            System.out.println(a%b);
    }
}


// NumberTransformation Class

import java.util.Scanner;
import java.lang.Math;
public class NumberTransformation {

    long n;
    Scanner sc=new Scanner(System.in);

    /*       Decimal to      */
    public void DecToBin() // Dec to bin
    {
        long dec = sc.nextLong();
        String bin = Long.toBinaryString(dec);
        System.out.println(bin);
    }

    public void DecToOct() // Dec to Oct
    {
        long dec = sc.nextLong();
        String oct = Long.toOctalString(dec);
        System.out.println(oct);
    }

    public void DecToHexa() // Dec to Hexa
    {
        long dec = sc.nextLong();
        String hexa = Long.toHexString(dec);
        System.out.println(hexa);
    }

    /*        Binary to      */

    public void BinToDec() // Bin to Dec
    {
        String bin=sc.next();
        long dec = Long.parseLong(bin,2);
        System.out.println(dec);
    }

    public void BinToOct() // Bin to Oct
    {
        String bin=sc.next();
        long dec = Long.parseLong(bin,2);
        String oct = Long.toOctalString(dec);
        System.out.println(oct);
    }

    public void BinToHexa() // Bin to Hexa
    {
        String bin=sc.next();
        long dec = Long.parseLong(bin,2);
        String hexa = Long.toHexString(dec);
        System.out.println(hexa);
    }

    /*        Octal to        */

    public void OctToDec() // Oct to Dec
    {
        String oct = sc.next();
        long dec = Long.parseLong(oct,8);
        System.out.println(dec);
    }

    public void OctToBin() // Oct to Bin
    {
        String oct = sc.next();
        long dec = Long.parseLong(oct,8);
        String bin = Long.toBinaryString(dec);
        System.out.println(bin);
    }

    public void OctToHexa() // Oct to Hexa
    {
        String oct = sc.next();
        long dec = Long.parseLong(oct,8);
        String hexa = Long.toHexString(dec);
        System.out.println(hexa);
    }

    /*        Hexadecimal to        */

    public void HexaToDec() // Hexa to Dec
    {
        String hexa = sc.next();
        long dec = Long.parseLong(hexa,16);
        System.out.println(dec);
    }

    public void HexaToBin() // Hexa to Bin
    {
        String hexa = sc.next();
        long dec = Long.parseLong(hexa,16);
        String bin = Long.toBinaryString(dec);
        System.out.println(bin);
    }

    public void HexaToOct() // Hexa to Oct
    {
        String hexa = sc.next();
        long dec = Long.parseLong(hexa,16);
        String oct = Long.toOctalString(dec);
        System.out.println(oct);
    }

}


// BitwiseOperation Class

import java.util.Scanner;
public class BitwiseOperation {

        long n;
        BitwiseOperation(long n)
        {
            Scanner sc=new Scanner(System.in);
            System.out.println("Please select which type of input you want: ");
            System.out.println("1. Decimal");
            System.out.println("2. Baniry");
            System.out.println("3. Octal");
            System.out.println("4. Hexadecimal");
            int type =sc.nextInt();

            if(type==1) // Decimal
            {
                long dec1=sc.nextLong();
                long dec2=sc.nextLong();
                if(n==25)// OR operation
                {
                    long val = OR(dec1,dec2);
                    System.out.println(val);
                }
                if(n==26) // AND operation
                {
                    long val = AND(dec1,dec2);
                    System.out.println(val);
                }
                if(n==27) // X-OR operation
                {
                    long val = X_OR(dec1,dec2);
                    System.out.println(val);
                }
            }
            if(type == 2) // Binary
            {
                String bin1=sc.next();
                String bin2=sc.next();

                long dec1 = Long.parseLong(bin1,2);
                long dec2 = Long.parseLong(bin2,2);

                long dec=0;
                if(n==25) // OR operation
                    dec=OR(dec1,dec2);
                if(n==26) // AND operation
                    dec=AND(dec1,dec2);
                if(n==27) // X-OR operation
                    dec=X_OR(dec1,dec2);

                String bin = Long.toBinaryString(dec);
                System.out.println(bin);
            }

            if(type == 3) // Octal
            {
                String oct1=sc.next();
                String oct2=sc.next();

                long dec1 = Long.parseLong(oct1,8);
                long dec2 = Long.parseLong(oct2,8);

                long dec=0;
                if(n==25) // OR operation
                    dec=OR(dec1,dec2);
                if(n==26) // AND operation
                    dec=AND(dec1,dec2);
                if(n==27) // X-OR operation
                    dec=X_OR(dec1,dec2);

                String oct = Long.toOctalString(dec);
                System.out.println(oct);
            }

            if(type == 4) // Hexadecimal
            {
                String hexa1=sc.next();
                String hexa2=sc.next();

                long dec1 = Long.parseLong(hexa1,16);
                long dec2 = Long.parseLong(hexa2,16);

                long dec=0;
                if(n==25) // OR operation
                    dec=OR(dec1,dec2);
                if(n==26) // AND operation
                    dec=AND(dec1,dec2);
                if(n==27) // X-OR operation
                    dec=X_OR(dec1,dec2);

                String Hexa = Long.toHexString(dec);
                System.out.println(Hexa);
            }
        }

        public long OR(long dec1, long dec2)
        {
            long ans=(dec1|dec2);
            return ans;
        }

        public long AND(long dec1, long dec2)
        {
            long ans=(dec1&dec2);
            return ans;
        }

        public long X_OR(long dec1, long dec2)
        {
            long ans=(dec1^dec2);
            return ans;
        }
}


// TrigonometricFuntion Class

import java.lang.Math.*;
import java.util.Scanner;
public class TrigonometricFuntion {

    long n;
    Scanner sc=new Scanner(System.in);

    public void sin()
    {
        double a = sc.nextDouble();
        double b = (a*Math.PI)/180;
        System.out.println(Math.sin(b));
    }

    public void tan()
    {
        double a = sc.nextDouble();
        double b = (a*Math.PI)/180;
        if(a==90)
            System.out.println("Not Defined");
        else
            System.out.println(Math.tan(b));
    }

    public void cos()
    {
        double a = sc.nextDouble();
        double b = (a*Math.PI)/180;
        System.out.println(Math.cos(b));
    }
}


// Others Class

import java.util.Scanner;
import java.lang.Math;
public class Others {

    long n;
    Scanner sc=new Scanner(System.in);

    public void factorial()
    {
        long x = sc.nextLong();
        long fact=1;
        for(int i=1; i<=x; i++)
            fact*=i;
        System.out.println(fact);
    }

    public void square()
    {
        long x = sc.nextLong();
        System.out.println(x*x);
    }

    public void cube()
    {
        long x = sc.nextLong();
        System.out.println(x*x*x);
    }

    public void xToThePower()
    {
        long x = sc.nextLong();
        long y = sc.nextLong();
        long val=1;
        for(int i=1; i<=y; i++)
            val*=x;
        System.out.println(val);
    }

    public void squareRoot()
    {
        long x = sc.nextLong();
        System.out.println(Math.sqrt(x));
    }

    public void logarithm()
    {
        long x = sc.nextLong();
        System.out.println(Math.log10(x));
    }

    public void percentage()
    {
        long x = sc.nextLong();
        long y = sc.nextLong();
        long val = (x*y)/100;
        System.out.println(val);
    }

}


// Main Project Class

import java.util.Scanner;
public class Main
{
    public static void main(String[] args)
    {
        System.out.println("Assalamualikum\n");
        System.out.println("There are some feature we have,please select whice one you need");
        System.out.println(" 1. Summation(+)");
        System.out.println(" 2. Substraction(-)");
        System.out.println(" 3. Multiplication(x)");
        System.out.println(" 4. Division(/)");
        System.out.println(" 5. Mod(%)");
        System.out.println(" 6. Factorial(x!)");
        System.out.println(" 7. Square(x2)");
        System.out.println(" 8. Cube(x3)");
        System.out.println(" 9. X to the power Y(xY)");
        System.out.println("10. Square root");
        System.out.println("11. Logarithm(log)");
        System.out.println("12. Percentage(%)");
        System.out.println("13. Dec to Bin");
        System.out.println("14. Dec to Oct");
        System.out.println("15. Dec to Hexa");
        System.out.println("16. Bin to Dec");
        System.out.println("17. Bin to Oct");
        System.out.println("18. Bin to Hexa");
        System.out.println("19. Oct to Dec");
        System.out.println("20. Oct to Bin");
        System.out.println("21. Oct to Hexa");
        System.out.println("22. Hexa to Dec");
        System.out.println("23. Hexa to Bin");
        System.out.println("24. Hexa to Oct");
        System.out.println("25. Bitwise OR");
        System.out.println("26. Bitwise AND");
        System.out.println("27. Bitwise X-OR");
        System.out.println("28. Sin()");
        System.out.println("29. Cos()");
        System.out.println("30. Tan()");
        System.out.println(" 0. Exit");


        Scanner input=new Scanner(System.in);
        boolean ok=true;
        long n;
        while(ok)
        {
            n=input.nextInt();
            if(n==0)
                break;

            if(n<=5)
                arithmeticCalculation(n);
            else if(n<=12)
                others(n);
            else if(n<=24)
                numberTransformation(n);
            else if(n<=27)
                bitwiseOperation(n);
            else if(n<=30)
                trigonometricFuntion(n);
        }
    }

    public static void arithmeticCalculation(long n)
    {
        ArithmeticCalculation obj = new ArithmeticCalculation();
        if(n==1) // summation
            obj.summation();
        if(n==2) // substraction
            obj.substraction();
        if(n==3) // multiplication
            obj.multiplication();
        if(n==4) // division
            obj.division();
        if(n==5) // mod
            obj.mod();
    }

    public static void others(long n)
    {
        Others obj = new Others();
        if(n==6) // factorial
            obj.factorial();
        if(n==7) // square
            obj.square();
        if(n==8) // cube
            obj.cube();
        if(n==9) // X to the power y
            obj.xToThePower();
        if(n==10) // square root
            obj.squareRoot();
        if(n==11) // logarithm
            obj.logarithm();
        if(n==12) // percentage
            obj.percentage();
    }

    public static void numberTransformation(long n)
    {
        NumberTransformation obj = new NumberTransformation();

        if(n==13) // Dec to Bin
            obj.DecToBin();
        if(n==14) // Dec to Oct
            obj.DecToOct();
        if(n==15) // Dec to Hexa
            obj.DecToHexa();

        if(n==16) // Bin to Dec
            obj.BinToDec();
        if(n==17) // Bin to Oct
            obj.BinToOct();
        if(n==18) // Bin to Hexa
            obj.BinToHexa();

        if(n==19) // Oct to Dec
            obj.OctToDec();
        if(n==20) // Oct to Bin
            obj.OctToBin();
        if(n==21) // Oct to Hexa
            obj.OctToHexa();

        if(n==22) // Hexa to Dec
            obj.HexaToDec();
        if(n==23) // Hexa to Bin
            obj.HexaToBin();
        if(n==24) // Hexa to Oct
            obj.HexaToOct();
    }

    public static void bitwiseOperation(long n)
    {
        BitwiseOperation obj = new BitwiseOperation(n);
    }

    public static void trigonometricFuntion(long n)
    {
        TrigonometricFuntion obj = new TrigonometricFuntion();
        if(n==28) // sin()
            obj.sin();
        if(n==29) // cos()
            obj.cos();
        if(n==30) // tan()
            obj.tan();
    }

}