using System;

public class Program

{

    public static voidusing System;

​

namespace Second_Session

{

    internal class Program

    {

        static void Main(string[] args)

        {

​

​

​

            //-------------------------------تقدم عملگرها

            // int number = 3;

​

            //int number1 = 3 + ++number;

            //Console.WriteLine("number1 is {0} ", number1);

​

            //int number2 = 3 + number++;

            //Console.WriteLine("number1 is {0} ", number2);

​

            //number = (1 + 2) * (4 / 3) % (5 - (6 * 7));

            //Console.WriteLine("number is {0} ", number);

​

            //number = 3 * 2 + 8 / 4;

            //Console.WriteLine("number is {0} ", number);

​

            //----------------------------------------------------خواندن اطلاعات

            //string name;

            //int age;

            //double height;

            //float Weight;

​

            //Console.Write("Enter your name: ");

            //name = Console.ReadLine();

            //Console.Write("Enter your age: ");

            //age = Convert.ToInt32(Console.ReadLine());

            //Console.Write("Enter your height: ");

            //height = Convert.ToDouble(Console.ReadLine());

            //Console.Write("Enter your Weight: ");

            //Weight = float.Parse(Console.ReadLine());

            ////Print a blank line

            //Console.WriteLine();

            ////Show the details you typed

            //Console.WriteLine("Name is {0}.", name);

            //Console.WriteLine("Age is {0}.", age);

            //Console.WriteLine("Height is {0}.", height);

            //Console.WriteLine("Weight is {0}.", Weight);

​

            //-------------------------------------------------------IF شرط

            // int x = 11;

​

            //int number = 5;

​

            //if (number < 10)

            //    Console.WriteLine("Hello World.");

            //--------------

​

            //if (x > 10)

            //{

            //    Console.WriteLine("x is greater than 10.");

            //    Console.WriteLine("This is still part of the if statement.");

            //}

            //--------------

            //int firstNumber;

            //int secondNumber;

​

            //Console.Write("Enter a number: ");

            //firstNumber = Convert.ToInt32(Console.ReadLine());

            //Console.Write("Enter another number: ");

            //secondNumber = Convert.ToInt32(Console.ReadLine());

​

            //if (firstNumber == secondNumber)

            //{ Console.WriteLine("{0} == {1}", firstNumber, secondNumber); }

            //if (firstNumber != secondNumber)

            //{ Console.WriteLine("{0} != {1}", firstNumber, secondNumber); }

            //if (firstNumber < secondNumber)

            //{ Console.WriteLine("{0} < {1}", firstNumber, secondNumber); }

            //if (firstNumber > secondNumber)

            //{ Console.WriteLine("{0} > {1}", firstNumber, secondNumber); }

            //if (firstNumber <= secondNumber)

            //{ Console.WriteLine("{0} <= {1}", firstNumber, secondNumber); }

            //if (firstNumber >= secondNumber)

            //{ Console.WriteLine("{0} >= {1}", firstNumber, secondNumber); }

            //--------------

            //int number = 5;

            //if (number < 10)

            //{

            //    Console.WriteLine("The number is less than 10.");

            //}

            //else

            //{

            //    Console.WriteLine("The number is either greater than or equal to 10.");

            //}

            //--------------

            //string pet1 = "puppy";

            //string pet2 = "kitten";

            //string type1;

            //string type2;

​

            //type1 = (pet1 == "puppy") ? "dog" : "cat";

            //Console.WriteLine("type1 is {0} ", type1);

            //type2 = (pet2 != "kitten") ? "dog" : "cat";

            //Console.WriteLine("type2 is {0} ", type2);

            //--------------

​

            //int age;

            //string gender;

            //Console.Write("Enter your age: ");

            //age = Convert.ToInt32(Console.ReadLine());

            //Console.Write("Enter your gender (male/female): ");

            //gender = Console.ReadLine();

            //if (age > 12)

            //{

            //    if (age < 20)

            //    {

            //        if (gender == "male")

            //        {

            //            Console.WriteLine("You are a teenage boy.");

            //        }

            //        else

            //        {

            //            Console.WriteLine("You are a teenage girl.");

            //        }

            //    }

            //    else

            //    {

            //        Console.WriteLine("You are already an adult.");

            //    }

            //}

            //else

            //{

            //    Console.WriteLine("You are still too young.");

            //}

            //--------------

            //int x = 6, y = 3;

​

            //if (x == 2 && y == 3)

            //{

            //    Console.WriteLine("And Is true");

            //}

            //if (x == 2 || y == 3)

            //{

            //    Console.WriteLine("Or Is True");

            //}

​

            //-------------------------------------------------------switch

​

            //int choice;

            //Console.WriteLine("What's your favorite pet?");

            //Console.WriteLine("[1] Dog");

            //Console.WriteLine("[2] Cat");

            //Console.WriteLine("[3] Rabbit");

            //Console.WriteLine("[4] Turtle");

            //Console.WriteLine("[5] Fish");

            //Console.WriteLine("[6] Not in the choices");

            //Console.Write("\nEnter your choice: ");

            //choice = Convert.ToInt32(Console.ReadLine());

            //switch (choice)

            //{

            //    case 1:

            //        Console.WriteLine("Your favorite pet is Dog.");

            //        break;

            //    case 2:

            //        Console.WriteLine("Your favorite pet is Cat.");

            //        break;

            //    case 3:

            //        Console.WriteLine("Your favorite pet is Rabbit.");

            //        break;

            //    case 4:

            //        Console.WriteLine("Your favorite pet is Turtle.");

            //        break;

            //    case 5:

            //        Console.WriteLine("Your favorite pet is Fish.");

            //        break;

            //    case 6:

            //        Console.WriteLine("Your favorite pet is not in the choices.");

            //        break;

            //    default:

            //        Console.WriteLine("You don't have a favorite pet.");

            //        break;

            //}

​

            //-------------------------------------------------------حلقه----------------------

​

            //int counter = 1;

            //while (counter <= 10)

            //{

            //    Console.WriteLine("Hello World by while!");

            //    counter++;

            //}

            //--------------

            //int number = 1;

            //do

            //{

            //    Console.WriteLine("Hello World by do while!");

            //    number--;

            //} while (number > 11);

            //--------------

            //for (int i = 1; i <= 10; i++)

            //{

            //    Console.WriteLine("Number " + i);

            //}

            //--------------

            //for (int i = 1; i <= 4; i++)

            //{

            //    for (int j = 1; j <= 5; j++)

            //    {

            //        Console.WriteLine(" * ");

            //    }

            //    Console.Write("\n");

            //}

            //--------------

​

            //Console.WriteLine("Demonstrating the use of break.\n");

            //for (int x = 1; x <= 10; x++)

            //{

            //    if (x == 5)

            //        break;

            //    Console.WriteLine("Number " + x);

            //}

            //Console.WriteLine("\nDemonstrating the use of continue.\n");

            //for (int x = 1; x <= 10; x++)

            //{

            //    if (x == 5)

            //        continue;

            //    Console.WriteLine("Number " + x);

            //}

​

            //-------------------------------------------------------آرایه----------------------

​

            //int[] numbers = new int[5];

            //numbers[0] = 1;

            //numbers[1] = 2;

            //numbers[2] = 3;

            //numbers[3] = 4;

            //numbers[4] = 5;

​

            //--------------

​

            //int[] numbers = new int[5];

            //int total = 0;

            //double average;

​

            //for (int i = 0; i < numbers.Length; i++)

            //{

            //    Console.Write("Enter a number: ");

            //    numbers[i] = Convert.ToInt32(Console.ReadLine());

            //}

            //for (int i = 0; i < numbers.Length; i++)

            //{

            //    total += numbers[i];

            //}

            //average = total / (double)numbers.Length;

            //Console.WriteLine("Average = {0}", average);

​

​

            //--------------

​

            //int[] numbers = { 100, 2, 3, 70, 500 };

            //foreach (int n in numbers)

            //{

​

            //    Console.WriteLine("Number {0}", n);

            //}

            //--------------

            //double[,] studentGrades = new double[2, 3];

            //double total;

​

            //for (int student = 0; student < studentGrades.GetLength(0); student++)

            //{

            //    total = 0;

            //    Console.WriteLine("Enter grades for Student {0}", student + 1);

            //    for (int grade = 0; grade < studentGrades.GetLength(1); grade++)

            //    {

            //        Console.Write("Enter Grade #{0}: ", grade + 1);

            //        studentGrades[student, grade] = Convert.ToDouble(Console.ReadLine());

            //        total += studentGrades[student, grade];

            //    }

            //    Console.WriteLine("Average is {0:F2}", (total / studentGrades.GetLength(1)));

            //    Console.WriteLine();

            //}

​

​

            //-------------------------------------------------------متدها----------------------------------

            //PrintMessage();

​

​

            //int result = CalculateSum();

            //Console.WriteLine("Sum is {0}.", result);

​

            //int result1 = GetNumber();

            //Console.WriteLine("Result = {0}.", result1);

​

​

            // TestReturnExit();

​

​

            //int num1, num2;

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

            //num1 = Convert.ToInt32(Console.ReadLine());

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

            //num2 = Convert.ToInt32(Console.ReadLine());

            //Console.WriteLine("Sum = {0}", CalculateSum(num1, num2));

​

​

            //--------------Ref 

​

            //int num = 5;

            //Console.WriteLine("num = {0}\n", num);

            //Console.WriteLine("Passing num by value to method ModifyNumberVal() ...");

            //ModifyNumberVal(num);

            //Console.WriteLine("Value of num after exiting the method is {0}.\n", num);

            //Console.WriteLine("Passing num by ref to method ModifyNumberRef() ...");

            //ModifyNumberRef(ref num);

            //Console.WriteLine("Value of num after exiting the method is {0}.\n", num);

​

​

            //--------------out

            //int myNumber;

            //GiveValue(out myNumber);

            //Console.WriteLine("myNumber = {0}", myNumber);

​

            //--------------Array Argument

​

            //int[] array = { 1, 2, 3, 4, 5 };

            //IncrementElements(array);

            //foreach (int num in array)

            //{

            //    Console.WriteLine(num);

            //}

​

            //--------------params

​

            //Console.WriteLine("1 + 2 + 3 = {0}", CalculateSum(1, 2, 3));

            //Console.WriteLine("1 + 2 + 3 + 4 = {0}", CalculateSum(1, 2, 3, 4));

            //Console.WriteLine("1 + 2 + 3 + 4 + 5 = {0}", CalculateSum(1, 2, 3, 4, 5));

​

            //int number = 10;

​

            //DemonstrateScope();

            //Console.WriteLine("number inside the Main method = {0}", number);

​

            //PrintMessage();

            //PrintMessage1("Learn C# Today!");

​

​

            //--------------MethodOverLoading

            //ShowMessage(3);

            //ShowMessage(3.5);

​

            //--------------Factorial

​

            // Console.WriteLine(Factorial(4));

​

            Console.ReadKey();

        }

​

        static void PrintMessage()

        {

            Console.WriteLine("Hello World!");

        }

        static void PrintMessage1(string message = "Welcome to Visual C# Tutorials!")

        { 

            Console.WriteLine(message);

        }

        static void ShowMessage(int num)

        {

            Console.WriteLine("Int version of the method was called.");

        }

        static void ShowMessage(double num)

        {

            Console.WriteLine("double version of the method was called.");

        }

        static void DemonstrateScope()

        {

            int number = 5;

            Console.WriteLine("number inside method DemonstrateScope() = {0}", number);

        }

​

        static int CalculateSum()

        {

            int firstNumber = 10;

            int secondNumber = 5;

            int sum = firstNumber + secondNumber;

            return sum;

        }

​

        static int GetNumber()

        {

            int number;

            Console.Write("Enter a number greater than 10: ");

            number = Convert.ToInt32(Console.ReadLine());

            if (number > 10)

            {

                return number;

            }

            else

            {

                return 0;

            }

        }

​

        static void TestReturnExit()

        {

            Console.WriteLine("Line 1 inside the method TestReturnExit()");

            Console.WriteLine("Line 2 inside the method TestReturnExit()");

            return ; //The following lines will not execute

            Console.WriteLine("Line 3 inside the method TestReturnExit()");

            Console.WriteLine("Line 4 inside the method TestReturnExit()");

        }

​

        static int CalculateSum(int number1, int number2)

        {

            return number1 + number2;

        }

​

        static void ModifyNumberVal(int number)

        {

            number += 10;

            Console.WriteLine("Value of number inside method is {0}.", number);

        }

        static void ModifyNumberRef(ref int number)

        {

            number += 10;

            Console.WriteLine("Value of number inside method is {0}.", number);

        }

        static void GiveValue(out int number)

        {

            number = 10;

        }

        static void IncrementElements(int[] numbers)

        {

            for (int i = 0; i < numbers.Length; i++)

            {

                numbers[i]++;

            }

        }

        static int CalculateSum(params int[] numbers)

        {

            int total = 0;

            foreach (int number in numbers)

            {

                total += number;

            }

​

            return total;

        }

        static long Factorial(int number)

        {

            if (number == 1)

                return 1;

​

            return number * Factorial(number - 1);

        }

​

​

        }

}

 Main()

    {

        Console.WriteLine("Hello World");

    }

}