Prensible Programing

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Logicall operators

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Logical (Boolean) operators take Boolean values and return a Boolean result (true or false). T

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AND

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&&)

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OR

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||

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exclusive OR"

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(^)

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&& Operator :

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t is pronounced as and operator. It returns true if both or all the condition is true and return false if any of the condition is false.

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|| Operator

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Itis pronounced as or operator. It also returns true or false based on condition. If any one of the condition matches then it returns true but if both or all the conditions are false then it returns false.

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logical negation

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!

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Comparison Operators:

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Comparison operatorsin C# are used to compare two or more operands.

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comparison operators:

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greater than (>) -less than (<) -greater than or equal to (>=) -less than or equal to (<=) -equality (==) -difference (!=)

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Example for increment and decrement

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inta = 5; iYantb = 4; Console.WriteLine(a++ + b); // 9 Console.WriteLine(++a + b++); // 11 Console.WriteLine(a--+ b); // 12 Console.WriteLine(--a + ++b); // 11 Console.WriteLine(--a + --b); // 9

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What isComputer Programming?

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??

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Define: Computer Programming

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creatingasequenceof instructionstoenablethecomputertodosomething

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Programming Phases

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??

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SampleC# program:

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using System; class HelloCSharp {

tatic void Main(){

Console.WriteLine("Hello, C#");

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using System;

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Include the standard

namespace "System"

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What is "C#"?

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Programming language

A syntax that allow to give instructions to the

computer

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C# feature

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New developed language Extremely powerful Easy to learn Easy to read and understand

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C#

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C#isamodernobject-oriented,general-purposeprogramminglanguage,created anddevelopedbyMicrosofttogetherwiththe

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Starting the Project :

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start the project, we press [Ctrl+F5] .The program will start and the result will be displayed on the console, followed by the "Press any key to continue...

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First C# Program

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Before we continue with an in depth description of the C# language and the , let’s take a look at a simple example, how a program written in C# looks like: class HelloCSharp { static void Main(string[] args) { Console.WriteLine("Hello C#!"); }

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firstprogramconsistsofthreelogicalparts:

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DefinitionofaclassHelloCSharp; -DefinitionofamethodMain(); -ContentsofthemethodMain().

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(Comma)

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,

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Dot

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.

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BlankSpace

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.

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Semicolon

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;

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Double Conations)

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""

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Colon

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:

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C#DistinguishesbetweenUppercaseandLowercase:

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ForexamplebagisdifferentfromBagwhichis differentfromBAG.

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Identifiers:

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Anidentifierisanamegiventosomeprogramentity,such asvariable,constant,array,function,structure,orclass

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Data types

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are sets (ranges) of values that have similar characteristics. For instance byte type specifies the set of integers in the range of [0 ... 255].

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Characteristics :

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Data types are characterized by: -Name –for example, int; -Size (how much memory they use) –for example, 4 bytes;

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byte

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8bit

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short

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16

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int

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32

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long

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64

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char

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16

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float

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32

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double

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64

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decimal

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128

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Bool

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________

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Integer types

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represent integer numbers is intand long. Let’s examine them one by one.

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Int64.MinValue

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-9,223,372,036,854,775,808 and its

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MaxValue

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9,223,372,036,854, 775,807 ).