หลักการเขียนโปรแกรมคอมพิวเตอร์เบื้องต้น โดยใช้ภาษา C# และใช้โปรแกรม RAPTOR ในการออกแบบ Flowchart

1. Chapter 3
The Concept of data
Company
LOGO

2.  Data Types
 Constants vs. Variables
 Naming rules

3. Data Types

data)

4. Data Types





Numeric – Integers and Real
Character – Character single quote)
String – Text (Double quote)
Logical or Boolean
True or False / 1 or 0)

5. Data Types
Data Type
object)
C#

6. Data Types
sbyte -128
byte
127
C#
1
0 - 255
1
short -32,768
32,767
2
ushort 0 – 65,535
2
ushort
short
unsign

7. Data Types
int
C#
4
uint
0 – 4,294,967,295
4
long
-
8
ulong
8

8. Data Types
float
-3.4*1038
+34*1038
4
double
±5.0 × 10−324
to
8
±1.7 × 10308
float
decimal
8
C#

9. Data Types
bool
char
true
false
1
1
true
2
string
"hello"
false
'a'
C#

10. Data Types

Framework Type
C#
Type
bool
byte
sbyte
char
decimal
double
float
int
.NET Framework
Type
System.Boolean
System.Byte
System.SByte
System.Char
System.Decimal
System.Double
System.Single
System.Int32
C#
.NET
int x = 123;
System.Int32 y = 123;

11. Constants vs. Variables

Constants)
Variables)
equal, =)
 Constant
Variable
Constants
Variables

12. Variables

variable)
Identifier)

Input
Output)

13. Variables

DataType variableName; int age;
;
string name;

int age, height, weight;
string name = "Jirasak";

14. Constants

C#
const

15. Variables

const DataType constantName = value;
const
=
const double rate = 0.25;
const int wage = 300;
;

16. Naming rules

naming)
Hungarian Notation, Pascal case, Camel
case
Upper case

17. Hungarian Notation
Win32

C++
Charles Simonyi)
data type



iTotal
integer
bAnswer
boolean
sName
string
Total
Answer
Name

18. Pascal case

Pascal case
upper case)
(lower case)
FirstName, LastName, BirthDate
ProductPrice

19. Camel case

case)
Camel case
Camel case
Pascal case
lower
FirstName
lastName, birthDate
firstName
Camel case
productPrice

20. Upper case

upper case
ID

case, Camel case
PI
Upper case
Pascal

21. C#
(identifier)
C#

identifier
identifier
1.
2.
3.
4.
C#
underscore)
reserved word)
namespace, int, void, static
(
A-Z, a-z)
class,

22. 

underscores
name

bDate
case sensitive
NAME
Name,
BirthDate birthDate
date

23. 


CamelCase
underscore
identifiers
comment

24. 

3
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