CSharp

CSharp – if Statement

With if statement you can set up conditional blocks of code.

if – else if – else

using System;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main()
        {
            Console.Write("Enter a character: ");
            char ch = (char)Console.Read();

            if (Char.IsUpper(ch))
            {
                Console.WriteLine("The character is an uppercase letter.");
            }
            else if (Char.IsLower(ch))
            {
                Console.WriteLine("The character is a lowercase letter.");
            }
            else if (Char.IsDigit(ch))
            {
                Console.WriteLine("The character is a number.");
            }
            else
            {
                Console.WriteLine("The character is not alphanumeric.");
            }
        } // End Main()
    }
}

if – nested

using System;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main()
        {
            Console.Write("Enter a character: ");
            char c = (char)Console.Read();
            if (Char.IsLetter(c))
            {
                if (Char.IsLower(c))
                {
                    Console.WriteLine("The character is lowercase.");
                }
                else
                {
                    Console.WriteLine("The character is uppercase.");
                }
            }
            else
            {
                Console.WriteLine("The character isn't an alphabetic character.");
            }
        } // End Main()
    }
}

if – boolean

using System;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main()
        {
            // Change the values of these variables to test the results.
            bool Condition1 = true;
            bool Condition2 = true;
            bool Condition3 = true;
            bool Condition4 = true;

            if (Condition1)
            {
                // Condition1 is true.
            }
            else if (Condition2)
            {
                // Condition1 is false and Condition2 is true.
            }
            else if (Condition3)
            {
                if (Condition4)
                {
                    // Condition1 and Condition2 are false. Condition3 and Condition4 are true.
                }
                else
                {
                    // Condition1, Condition2, and Condition4 are false. Condition3 is true.
                }
            }
            else
            {
                // Condition1, Condition2, and Condition3 are false.
            }
        } // End Main()
    }
}

if – AND NOT

using System;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main()
        {
            // NOT
            bool result = true;
            if (!result)
            {
                Console.WriteLine("The condition is true (result is false).");
            }
            else
            {
                Console.WriteLine("The condition is false (result is true).");
            }

            // Short-circuit AND
            int m = 9;
            int n = 7;
            int p = 5;
            if (m >= n && m >= p)
            {
                Console.WriteLine("Nothing is larger than m.");
            }

            // AND and NOT
            if (m >= n && !(p > m))
            {
                Console.WriteLine("Nothing is larger than m.");
            }

            // Short-circuit OR
            if (m > n || m > p)
            {
                Console.WriteLine("m isn't the smallest.");
            }

            // NOT and OR
            m = 4;
            if (!(m >= n || m >= p))
            {
                Console.WriteLine("Now m is the smallest.");
            }
            // Output:
            // The condition is false (result is true).
            // Nothing is larger than m.
            // Nothing is larger than m.
            // m isn't the smallest.
            // Now m is the smallest.
        } // End Main()
    }
}

My Website: http://www.lucedigitale.com

References:
http://msdn.microsoft.com/it-it/library/5011f09h.aspx
http://csharp.net-tutorials.com/basics/if-statement/

CSharp – ArrayList

To use ArrayList you need: using System.Collections;

using System;
using System.Collections; // class for ArrayList

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            // <type> <name of the list> = new ArrayList()
            ArrayList list = new ArrayList();
            // add an element
            list.Add("Mario");
            list.Add("Luca");
            list.Add("Giovanni");

            // per ogni elemento nella lista
            foreach (string name in list)
                Console.WriteLine(name);

            Console.ReadLine();
        }
    }
}

The result is:
Mario
Luca
Giovanni

Complete Reference: http://msdn.microsoft.com/it-it/library/system.collections.arraylist(v=vs.110).aspx

CSharp – Array

Array – foreach

using System;
using System.Collections;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            // <un array di stringhe> <nome array> = new string[numero elementi nell'array]
            string[] names = new string[2];

            // array[indice] = assegna il valore
            names[0] = "Andrea";
            names[1] = "Mario";

            // visualizza tutti i valori contenuti
            foreach (string s in names)
                Console.WriteLine(s);

            Console.ReadLine();
        }
    }
}

The result is:
Andrea
Mario

Array – for

...
for(int i = 0; i < names.Length; i++)
    Console.WriteLine("Item number " + i + ": " + names[i]);
...

Array – short syntax

...
int[] numbers = new int[5] { 4, 3, 8, 0, 5 };
...
int[] numbers = { 4, 3, 8, 0, 5 };
...

My website: http://www.lucedigitale.com

Reference: http://csharp.net-tutorials.com/basics/arrays/