using System;

public class Program

{

    public static void Main()

    {

        //declare

        int x = 5;

        int y = 10;

        //1

        Console.WriteLine("x + y = "+ (x + y));

        Console.WriteLine("x - y = "+ (x - y));

        Console.WriteLine("x++ = "+ (x++));

        Console.WriteLine("x-- = "+ (x--));

        Console.WriteLine("++x = "+ (++x));

        Console.WriteLine("\n");

        //2

        int myInt = 42;

        Console.WriteLine("int => \t\t"+myInt+"\t\t\t\tUse for whole numbers without a fractional part ");

        double myDouble = 3.14159265359;

        Console.WriteLine("double =>  \t"+myDouble+" \tUse for numbers with a decimal point, or when you need higher precision. ");

        decimal myDecimal = 1234.5678m;

        Console.WriteLine("decimal => \t"+myDecimal+" \t\tUse for financial or monetary calculations requiring high precision. ");

        float myFloat = 1.2345f;

        Console.WriteLine("decimal => \t"+myFloat+"\t\t\tUse when you need a floating-point type with lower precision than double. ");

        Console.WriteLine("\n");

        //3

        Console.WriteLine((int)myDouble);

        Console.WriteLine("\n");

        //4

        int a = x;

        Console.WriteLine("a = "+ (a));

        a += 10;

        Console.WriteLine("a += "+ (a));

        a -= 10;

        Console.WriteLine("a -= "+ (a));

        Console.WriteLine("\n");

        //5

        Console.WriteLine(Math.Round(myDouble));

        Console.WriteLine(Math.Pow(a,2));

        Console.WriteLine(Math.Sqrt(y));

        Console.WriteLine(Math.Pow(a,2));

        Console.WriteLine(Math.Min(1,4));

        Console.WriteLine(Math.Max(1,4));

        Console.WriteLine("\n");

        //6

        String myString = "Hello";

        Console.WriteLine(myString);

        myString = myString+" World";

        Console.WriteLine(myString);

        int w = 10;

        Console.WriteLine(myString+" "+w);

    }

}