using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        Console.WriteLine();

        bool check = true;

        if (check) 

        {

            Console.WriteLine("Everything is fine");

        }

        else

        {

            Console.WriteLine("Run!");

        }

        // >, <, >=, <=, !=, ==

        int number = 11;

        int checker = 6;

        if (number > checker) 

        {

            Console.WriteLine("Your number is greater than " + checker);

        }

        else

        {

            Console.WriteLine("Your number is less than " + checker);

        }

        // &&, || => for range

        // Check if the num is in [2, 9)

        int numInRange = 5;

        if (numInRange >= 2 && numInRange < 9)

        {

            Console.WriteLine($"{numInRange} is In range [2,9)");

        }

        else

        {

            Console.WriteLine($"{numInRange} is In range [2,9)");

        }

​

        // (-Infinity, 2) or [9, infinity)

        numInRange = 101;

        if (numInRange >= 2 && numInRange < 9)

        {

            Console.WriteLine($"{numInRange} is In range [2,9)");

        }

        else if (numInRange < 2)

        {

            Console.WriteLine($"{numInRange} is In range (-Infinity, 2)");

        }

        else if( numInRange >= 9)

        {

            Console.WriteLine($"{numInRange} is In range [9, Infinity)");

        }

        else

        {

            Console.WriteLine($"{numInRange} is In range [2,9)");

        }

        string str = "abc";

        // Comment testing: abc123

        /*

        MultiLine Comment

        */

        str += "123";

        Console.WriteLine(str);

        Console.WriteLine(str.ToUpper());

        // () {} []

        // () -> calling a method

        // () => sequence of operations Ex: c + (a+b)

        // () => conditions

        // () => loop

        // {} => block

        {

            int a = 555;

            Console.WriteLine(a);

            Console.WriteLine("I am in the block: " + str);

            // Console.WriteLine("I am in the block: " + outOfBlock);

        }

        int outOfBlock = 666;

        // Console.WriteLine(a); // you don't see a here out of block

        // [] => array, index

        Console.WriteLine("str: " + str);

        // abc123 (Lenght == 6) 012345 [2, 6]: [a,b] = b - a + 1

        Console.WriteLine(str[3]);

        Console.WriteLine("str Length: " + str.Length);

        char letterA = str[0];

        Console.WriteLine(letterA);

        char letterC = (char)str[2];

        Console.WriteLine(char.IsNumber(str[4]));

        Console.WriteLine(char.IsNumber(str, 2));

        char ch = 'g';

        Console.WriteLine(ch);

        string tab = "\t";

        Console.WriteLine("Hello" + tab + "TabTester");

        string exTest = "/t";

        Console.WriteLine("Hello" + exTest + "TabTester");

​

        string path = @"C:\to table\numberEmpty\my";

        Console.WriteLine(path);

        string mySpaces = @" I live in

             my hometown

                 hello...";

        Console.WriteLine(mySpaces);

        // loop

        // Print 1..25

        int numToPrint = 1;

        int limit = 25; 

        while (numToPrint <= 25)

        {

            Console.WriteLine(numToPrint);

            numToPrint++;

        }

        Console.WriteLine("Starting do..while....");

        // Print Numbers in [5, 9]

        int numForDo = 5;

        int limitForDo = 9;

        //int testNum = 26;

        // int testNum = 4;

        int testNum = 2;

        do 

        {

            Console.WriteLine(testNum);

            testNum++;

        }

        while(testNum >= numForDo && testNum <= limitForDo); // [numberForDo,limitForDo]

        // for

        Console.WriteLine("Testing for loop");

        for(int index = 0; index < 10; index++)

        {

            Console.WriteLine(index);

        }

    }

}