using System;

public class Program

{

    public static void Main()

    {

        //1

        Console.WriteLine("ENTER  A NUMBER");

        int X = int.Parse(Console.ReadLine());

        Console.WriteLine("the num is :"+X);

        //2

        Console.WriteLine("ENTER  A NUMBER to chec if ie divisable by 4 and 3 :");

        int y = int.Parse(Console.ReadLine());

        if (y%4==0 && y%3==0)

            Console.WriteLine("yes");

        else 

            Console.WriteLine("No");

        //3

        Console.WriteLine("ENTER  Two NUMBERS :");

        int M = int.Parse(Console.ReadLine());

        int N = int.Parse(Console.ReadLine());

        if(M>N){

            Console.WriteLine("the max num :"+M);

        }

        else

            Console.WriteLine("the max num :"+N);

        //4

        Console.WriteLine("ENTER  A NUMBER");

        int b = int.Parse(Console.ReadLine());

        if(b>0){

            Console.WriteLine("Positive");

        }

        else if(b<0){

            Console.WriteLine("Negative");

        } 

        else 

            Console.WriteLine("zero");

        //5

        Console.WriteLine("ENTER Three NUMBERS :");

        int c = int.Parse(Console.ReadLine());

        int d = int.Parse(Console.ReadLine());

        int e = int.Parse(Console.ReadLine());

​

            if(c>d && c>e){

                Console.WriteLine("Max is :"+c);

            }

            else if(d>e&& d>c)

                Console.WriteLine("Max is :"+d);

            else 

                Console.WriteLine("Max is :"+e);

            if(c<d && c<e){

                Console.WriteLine("Min is :"+c);

            }

            else if(d<e&& d<c)

                Console.WriteLine("Min is :"+d);

            else 

                Console.WriteLine("Min is :"+e);

        //6

            int f = int.Parse(Console.ReadLine());

            if(f%2==0){

                Console.WriteLine("Num is even");

            }

        else 

            Console.WriteLine("Num is odd");

        //7

        Console.Write("7_Enter a character: ");

        string inputChar =Console.ReadLine();

        Console.WriteLine();

​

        if (inputChar == "a" || inputChar == "e" || inputChar == "i" || inputChar == "o" || inputChar == "u")

        {

            Console.WriteLine("vowel");

        }

        else  

        {

            Console.WriteLine("Consonant");

        }

        //8

        Console.Write("8_Enter two Numbers: ");

        int num1 = int.Parse(Console.ReadLine());

        int num2 = int.Parse(Console.ReadLine());

        int pow=(num1^num2);

        Console.Write("power = "+pow);

        //9

            Console.Write("9_Enter five Grades: ");

        int n1 = int.Parse(Console.ReadLine());

        int n2 = int.Parse(Console.ReadLine());

        int n3 = int.Parse(Console.ReadLine());

        int n4 = int.Parse(Console.ReadLine());

        int n5 = int.Parse(Console.ReadLine());

        int sum = n1+n2+n3+n4+n5;

        int avg =sum/5 ;

        double per =(sum/500)*100; 

        Console.Write("sum = "+sum);

        Console.Write("Avg = "+avg);

        Console.Write("Persentage = "+per +"%");

        //10

        int g1 = int.Parse(Console.ReadLine());

        int g2 = int.Parse(Console.ReadLine());

        int g3 = int.Parse(Console.ReadLine());

        int g4 = int.Parse(Console.ReadLine());

        int g5 = int.Parse(Console.ReadLine());

        int Sum = g1+g2+g3+g4+g5;

        int  Avg=Sum/5 ;

        if(Avg>=90)

            Console.Write("Grade A");

            else if(Avg >=80)

            Console.Write("Grade B");

        else if(Avg >=70)

            Console.Write("Grade c");

        else if(Avg >=60)

            Console.Write("Grade d");

        else if(Avg >=40)

            Console.Write("Grade E");

        else 

            Console.Write("Grade f");

        //12

        int n = int.Parse(Console.ReadLine());

        switch(n)

        {

            case >0:

                Console.WriteLine("Positive");

                break;

            case <0:

                Console.WriteLine("Negative");

                break;

            case 0:

                Console.WriteLine("Zero");

                break;

            default:

                Console.WriteLine("invalid input");

                break;

        }

        //13

​

        Console.Write("Enter the first number: ");

        double n11 = Convert.ToDouble(Console.ReadLine());

​

        Console.Write("Enter an operator (+, -, *, /): ");

        char operation = Console.ReadKey().KeyChar;

        Console.WriteLine();

​

        Console.Write("Enter the second number: ");

        double n22 = Convert.ToDouble(Console.ReadLine());

        switch (operation)

        {

            case '+':

                Console.WriteLine($"Result: {n11 + n22}");

                break;

            case '-':

                Console.WriteLine($"Result: {n11 - n22}");

                break;

            case '*':

                Console.WriteLine($"Result: {n11 * n22}");

                break;

            case '/':

                if (num2 != 0)

                {

                    Console.WriteLine($"Result: {n11 / n22}");

                }

                else

                {

                    Console.WriteLine("Error: Division by zero is not allowed.");

                }

                break;

            default:

                Console.WriteLine("Invalid operator.");

                break;

        }

    }

}

​