This document is a presentation on data structures in C# by Mr. Mahmoud R. Alfarra. It introduces C# and its uses in different applications. It covers various data types in C#, calculations and logical operations, control statements like if/else and loops. The document also discusses arrays, methods, and classes in C#. It provides examples to explain concepts like selection statements, iteration, and calling methods. The presentation aims to provide an introduction to the principles of C# for learning purposes.

1. DATA STRUCTURE
Chapter 1: Intro To Principle of
C#
Prepared & Presented by
Mr. Mahmoud R. Alfarra
2010-2011
College of Science & Technology
Dep. Of Computer Science & IT
BCs of Information Technology
http://mfarra.cst.ps

2. Out Line
 What is C#?
 Data types, declaration of variables
 Calculations and logical operations
 Control statements
 Arrays
 Methods
 Class & Objects
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‫البيانات‬ ‫تراكيب‬ ‫مساق‬
‫إعداد‬ ‫العلمية‬ ‫المادة‬
/
‫أ‬
.
‫ا‬ َّ‫الفــر‬ ‫رفيق‬ ‫محمود‬

3. What is C#?
 C# (pronounced "C-sharp") is an object-
oriented programming language from Microsoft
that aims to combine the computing power of
C++ with the programming ease of Visual
Basic.
 C# is based on C++ and contains features
similar to those of Java.
 C# is designed to work with Microsoft's .Net
platform.
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4. Applications of C#
 Console Applications
 Windows Applications
 Mobile Applications
 ASP .NET Web Applications
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‫البيانات‬ ‫تراكيب‬ ‫مساق‬
‫إعداد‬ ‫العلمية‬ ‫المادة‬
/
‫أ‬
.
‫ا‬ َّ‫الفــر‬ ‫رفيق‬ ‫محمود‬

5. Data types, declaration of variables
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‫البيانات‬ ‫تراكيب‬ ‫مساق‬
‫إعداد‬ ‫العلمية‬ ‫المادة‬
/
‫أ‬
.
‫ا‬ َّ‫الفــر‬ ‫رفيق‬ ‫محمود‬
 Rules of variables in C# are the same of Java:
int x = 5, y = 9;
int x = 5;
int y = 9;

6. Calculations and logical
operations
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‫البيانات‬ ‫تراكيب‬ ‫مساق‬
‫إعداد‬ ‫العلمية‬ ‫المادة‬
/
‫أ‬
.
‫ا‬ َّ‫الفــر‬ ‫رفيق‬ ‫محمود‬
operator Type
()
++ --
postfix
++ -- ! prefix
* / %
+ -
< <= > >=
== !=
&&
||
= += -= *= /= %=

7. Control statements
 Selection statements
 Iteration statements

8. Selection statements
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‫البيانات‬ ‫تراكيب‬ ‫مساق‬
‫إعداد‬ ‫العلمية‬ ‫المادة‬
/
‫أ‬
.
‫ا‬ َّ‫الفــر‬ ‫رفيق‬ ‫محمود‬
 Selection statements in C# are identical with
java:
 If
 If … else
 nested if
 Switch

9. Example: Selection statements
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using System;
1
class Marks_using_if_else
2
{
3
static void Main()
4
{
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int mark;
6
String input;
7
Console.Write("Enter the mark: ");
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//Read mark
9
input = Console.ReadLine();
10
mark = int.Parse(input);
11
//check the mark
12
if (mark >= 50)
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Console.WriteLine("Passed");
14
Else
15
Console.WriteLine("Failed");
16
} }
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10. Example: Selection statements
10
static void Main()
1
{
2
int mark;
3
string input;
4
Console.Write("Enter the mark: ");
5
//Read mark
6
input = Console.ReadLine();
7
mark = int.Parse(input);
8
//check the mark
9
if (mark >= 85)
10
Console.WriteLine("Excellent");
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else if (mark >= 75)
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Console.WriteLine("Very Good");
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else if (mark >= 65)
14
Console.WriteLine("Good");
15
else if (mark >= 50)
16
Console.WriteLine("Passed");
17
Else
18
Console.WriteLine("Failed");
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} }
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11. Iteration statements
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‫البيانات‬ ‫تراكيب‬ ‫مساق‬
‫إعداد‬ ‫العلمية‬ ‫المادة‬
/
‫أ‬
.
‫ا‬ َّ‫الفــر‬ ‫رفيق‬ ‫محمود‬
 Iteration statements in C# like them of java
 while
 do… while
 for
 For each

12. Example: Iteration statements
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‫البيانات‬ ‫تراكيب‬ ‫مساق‬
‫إعداد‬ ‫العلمية‬ ‫المادة‬
/
‫أ‬
.
‫ا‬ َّ‫الفــر‬ ‫رفيق‬ ‫محمود‬
static void Main(string[] args)
{
int fact = 1;
for (int i = 1; i <= 10; i++)
fact = fact * i;
Console.WriteLine("fact of 10 is" + fact);
Console.Read();
}

13. Arrays
13
‫البيانات‬ ‫تراكيب‬ ‫مساق‬
‫إعداد‬ ‫العلمية‬ ‫المادة‬
/
‫أ‬
.
‫ا‬ َّ‫الفــر‬ ‫رفيق‬ ‫محمود‬

14. Arrays
14
‫البيانات‬ ‫تراكيب‬ ‫مساق‬
‫إعداد‬ ‫العلمية‬ ‫المادة‬
/
‫أ‬
.
‫ا‬ َّ‫الفــر‬ ‫رفيق‬ ‫محمود‬
type[] array_name = new type[ x ];
Type of elements No. of elements
type [] array_name;
array_name = new type[ x ];
1- D Array

15. Arrays
15
‫البيانات‬ ‫تراكيب‬ ‫مساق‬
‫إعداد‬ ‫العلمية‬ ‫المادة‬
/
‫أ‬
.
‫ا‬ َّ‫الفــر‬ ‫رفيق‬ ‫محمود‬
type[] [] array_name = new type[ x ][ y ];
Type of elemnts No. of rows
type [][] array_name;
array_name = new type[ x ][ y ];
No. of Col.
2- D array

16. Methods
16
‫البيانات‬ ‫تراكيب‬ ‫مساق‬
‫إعداد‬ ‫العلمية‬ ‫المادة‬
/
‫أ‬
.
‫ا‬ َّ‫الفــر‬ ‫رفيق‬ ‫محمود‬
return_type function_name (parameters type para_name)
{
// statements
Return_type;
}
Variable of returned type Name of method Parameters

17. Method’s call
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‫البيانات‬ ‫تراكيب‬ ‫مساق‬
‫إعداد‬ ‫العلمية‬ ‫المادة‬
/
‫أ‬
.
‫ا‬ َّ‫الفــر‬ ‫رفيق‬ ‫محمود‬
 To call (invoke) method sum, which receives two
integers numbers, and return their sum, we write the
following code:
int x = sum (4,5);
To download more example and practices
about
the principles of c#, please visit my site
and you tube channel:
http://mfarra.cst.ps
www.youtube.com/mralfarra1

18. Thank You …
18
‫البيانات‬ ‫تراكيب‬ ‫مساق‬
‫إعداد‬ ‫العلمية‬ ‫المادة‬
/
‫أ‬
.
‫ا‬ َّ‫الفــر‬ ‫رفيق‬ ‫محمود‬
Remember that: question is the key of knowledge

19. Ahl Eljanna 

‫احل‬‫ن‬‫ا‬ ‫اج‬‫م‬ ‫ن‬ ‫احلاحل‬‫ص‬‫ال‬ ‫وعملوا‬ ‫آمنوا‬ ‫الذين‬ ‫وبشر‬
‫ار‬‫جت‬
‫احل‬‫ا‬ ‫احل‬‫ا‬ ‫ا‬ ‫ار‬‫ا‬ ‫ان‬‫ا‬‫م‬ ‫احل‬‫ا‬ ‫من‬ ‫اوا‬‫ا‬ ‫ا‬ ‫احل‬‫ا‬‫م‬‫زل‬ ‫احل‬‫ا‬‫ك‬ ‫ا‬ ‫احل‬‫ا‬ ‫ها‬ ‫ان‬‫ا‬‫م‬
‫اذا‬‫ا‬‫ه‬ ‫لوا‬
‫اج‬‫ا‬‫ا‬‫م‬‫و‬ ‫حل‬ ‫احل‬‫ا‬‫ا‬‫ش‬‫ما‬ ‫ا‬‫ا‬‫ا‬‫ب‬ ‫اوا‬‫ا‬‫ا‬‫ا‬‫ون‬ ‫ات‬‫ا‬‫ا‬‫ب‬ ‫ان‬‫ا‬‫ا‬‫م‬ ‫احل‬‫ا‬‫ا‬‫ن‬ ‫ا‬ ‫اذ‬‫ا‬‫ا‬‫ل‬‫ا‬
‫ناوا‬ ‫احل‬‫ا‬‫ا‬
‫خحللدو‬ ‫حل‬ ‫وهج‬ ‫ر‬ ‫مط‬
19
‫البيانات‬ ‫تراكيب‬ ‫مساق‬
‫إعداد‬ ‫العلمية‬ ‫المادة‬
/
‫أ‬
.
‫ا‬ َّ‫الفــر‬ ‫رفيق‬ ‫محمود‬