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A Beginner’s Guide to FreeBasic 
Richard D. Clark
Ebben Feagan
A Clark Productions / HMCsoft Book
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Copyright (c)  Ebben Feagan and Richard Clark.
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.2
or any later version published by the Free Software Foundation;
with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
A copy of the license is included in the section entitled "GNU
Free Documentation License".
The source code was compiled under version .17b of the FreeBasic compiler and tested 
under Windows 2000 Professional and Ubuntu Linux 6.06. Later compiler versions may 
require changes to the source code to compile successfully and results may differ under 
different operating systems. All source code is released under version 2 of the Gnu Public 
License (http://www.gnu.org/copyleft/gpl.html).  The source code is provided AS IS, 
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 
FITNESS FOR A PARTICULAR PURPOSE.
Microsoft Windows®, Visual Basic® and QuickBasic® are registered trademarks and are 
copyright © Microsoft Corporation. Ubuntu is a registered trademark of Canonical 
Limited.
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To all the members of the FreeBasic community, especially the developers.
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Acknowledgments
Writing a book is difficult business, especially a book on programming. It is 
impossible to know how to do everything in a particular language, and everyone learns 
something from the programming community. I have learned a multitude of things from 
the FreeBasic community and I want to send my thanks to all of those who have taken 
the time to post answers and examples to questions.
I would also like to say a big thanks to the developers of FreeBasic. Without your 
continual hard work in development, we wouldn’t have what I consider the premier Open 
Source BASIC language for today.
The PDF version of this book was created Using Open Office 2.0.2, 
http://www.openoffice.org/.
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About the Book
FBeginner is a concise, hands-on beginner’s guide to FreeBasic and is aimed at the 
novice programmer. The book assumes no prior programming knowledge. The goal of the 
book is to create a solid foundation in the basics of programming in FreeBasic that the 
programmer can build and expand upon. 
FreeBasic is a cross-platform compiler, however this book concentrates on using 
FreeBasic under the 32-bit Microsoft Windows™ and GNU/Linux operating systems. 
However, other than the installation and setup portions of this book, most of the code 
should run under any of the supported platforms.
All of the source code presented in this book is original code, and can be 
downloaded from the Clark Productions website located at http://rdc.ascii-world.com/ or 
http://freebasic.hmcsoft.org/. 
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Conventions Used in the Book
The various styles used in the book along with their meaning, are listed below. The 
basic paragraph format is the font you see here with each paragraph indented.
Information that is supplemental to the topic being discussed will be presented in 
the format below.
These colored boxes have additional, supplemental or historical information associated 
with the current topic being discussed.
Source code is listed in a fixed font with borders to delimit the code segment. You 
should always type in the programs. Most are small and can be entered into the editor in 
just a couple of minutes. The physical act of typing in the programs will help you learn 
the vocabulary and structure of FreeBasic. You do not type in the line numbers; they are 
only for referencing the code in the text. The file name for the program is located after 
the code segment.
1
2
3
4
5
OptionExplicit
Cls
Print"HelloWorldFromFreeBasic!"
Sleep
End
Listing 1: helloworld.bas
Following each listing is an analysis paragraph which explains how the program 
works. It is marked by the word 
Analysis:
in bold with a fixed font. Even though many of 
the keywords you will see may have not be discussed in detail in the text, seeing these 
keywords in action will help you become familiar with the vocabulary of FreeBasic.
Analysis:
This will mark the beginning of an analysis section. The code will be 
discussed using the line numbers referenced in the listing. You do not type the numbers 
in the editor.
The output of a program is listed in a fixed font and enclosed in a gray box as 
shown below. This output is given so you can compare the results to see if you have 
entered the program correctly.
HelloWorldfromFreeBasic!
Output 1: program.bas
A potential problem is shown with a Caution paragraph. It is formatted similarly to 
the Analysis paragraph.
Caution This style will alert you to potential problems and offer some remedies or 
tips to avoid them.
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TableofContents
1 A Brief Introduction to FreeBASIC..............................................................14
D
IFFERENCES
FROM
Q
UICK
BASIC...............................................................................................14
K
EY
F
EATURES
OF
F
REE
BASIC..................................................................................................15
2 Numeric Data Types..................................................................................18
S
IGNED
V
ERSUS
U
NSIGNED
D
ATA
T
YPES
........................................................................................18
T
HE
F
LOATING
P
OINT
D
ATA
T
YPE
................................................................................................19
P
OINTER
D
ATA
T
YPES
..............................................................................................................19
N
UMERIC
V
ARIABLES
...............................................................................................................19
T
HE
D
IM
S
TATEMENT
..............................................................................................................20
S
HARED
V
ARIABLES
................................................................................................................20
S
TATIC
V
ARIABLES
..................................................................................................................21
C
OMMON
V
ARIABLES
...............................................................................................................22
E
XTERN
AND
I
MPORT
V
ARIABLES
..................................................................................................22
D
ATA
T
YPE
S
UFFIXES
..............................................................................................................22
C
HANGING
T
HE
D
EFAULT
D
ATA
T
YPE
............................................................................................23
U
SING
D
IFFERENT
N
UMBER
F
ORMATS
............................................................................................24
Hexadecimal Numbers................................................................................................24
Binary Numbers..........................................................................................................24
Octal Numbers............................................................................................................24
Exponential Numbers..................................................................................................24
W
HICH
D
ATA
T
YPE
T
O
U
SE
?....................................................................................................25
O
PTION
E
XPLICIT
...................................................................................................................25
A N
OTE
ABOUT
O
PTION
E
XPLICIT
...............................................................................................26
A L
OOK
A
HEAD
....................................................................................................................26
E
XCERCISES
.........................................................................................................................27
3 Converting Numeric Data Types.................................................................28
I
MPLICIT
D
ATA
C
ONVERSION
.......................................................................................................28
E
XPLICIT
D
ATA
C
ONVERSION
......................................................................................................30
Numeric Data Conversion Functions...........................................................................30
Using Conversion Functions in Macros........................................................................33
Decimal Rounding Functions.......................................................................................36
A L
OOK
A
HEAD
....................................................................................................................37
E
XERCISES
...........................................................................................................................38
4 Introduction to the C Runtime Library........................................................39
T
HE
#I
NCLUDE
D
IRECTIVE
........................................................................................................39
7
T
HE
D
ECLARATION
S
TATEMENT
....................................................................................................41
R
UNTIME
C
ONVERSION
F
UNCTIONS
...............................................................................................42
T
HE
A
DDRESS
O
F
O
PERATOR
@.................................................................................................43
T
ESTING
THE
R
UNTIME
C
ONVERSION
F
UNCTIONS
................................................................................45
A L
OOK
A
HEAD
....................................................................................................................46
5 Arithmetic Operators................................................................................47
A
RITHMETIC
O
PERATORS
...........................................................................................................47
S
HORTCUT
A
RITHMETIC
O
PERATORS
..............................................................................................51
B
INARY
N
UMBER
S
YSTEM
..........................................................................................................52
T
HE
S
IGN
B
IT
......................................................................................................................52
A L
OOK
A
HEAD
....................................................................................................................54
6 Bitwise Operators.....................................................................................55
T
HE
NOT O
PERATOR
.............................................................................................................55
T
HE
AND O
PERATOR
.............................................................................................................56
T
HE
OR O
PERATOR
...............................................................................................................58
T
HE
XOR O
PERATOR
.............................................................................................................60
T
HE
EQV O
PERATOR
.............................................................................................................61
T
HE
IMP O
PERATOR
..............................................................................................................63
S
HORTCUT
B
ITWISE
O
PERATORS
..................................................................................................63
T
HE
SHL 
AND
SHR O
PERATORS
...............................................................................................64
B
ITWISE
M
ACROS
...................................................................................................................66
A L
OOK
A
HEAD
....................................................................................................................67
7 Mathematical Functions............................................................................68
T
RIGONOMETRIC
F
UNCTIONS
......................................................................................................69
A
BSOLUTE
V
ALUE
AND
THE
S
GN
F
UNCTION
.....................................................................................70
L
OGARITHMS
........................................................................................................................71
T
HE
C R
UNTIME
L
IBRARY
M
ATH
C
ONSTANTS
AND
F
UNCTIONS
................................................................72
CRT Math Constants....................................................................................................72
Selected CRT Math Functions......................................................................................74
A L
OOK
A
HEAD
....................................................................................................................75
8 Pointer Data Type.....................................................................................76
P
OINTERS
AND
M
EMORY
...........................................................................................................76
T
YPED
AND
U
NTYPED
P
OINTERS
..................................................................................................78
P
OINTER
O
PERATORS
...............................................................................................................78
M
EMORY
F
UNCTIONS
...............................................................................................................78
P
OINTER
A
RITHMETIC
AND
P
OINTER
I
NDEXING
...................................................................................80
8
P
OINTER
F
UNCTIONS
...............................................................................................................82
S
UBROUTINE
AND
F
UNCTION
P
OINTERS
...........................................................................................83
C
REATING
A
C
ALLBACK
F
UNCTION
................................................................................................85
P
OINTER
TO
P
OINTER
..............................................................................................................89
A L
OOK
A
HEAD
....................................................................................................................92
9 String Data Types.....................................................................................93
D
YNAMIC
S
TRINGS
..................................................................................................................94
F
IXED
L
ENGTH
S
TRINGS
...........................................................................................................96
Z
STRINGS
............................................................................................................................97
W
STRINGS
...........................................................................................................................99
S
TRING
F
UNCTIONS
.................................................................................................................99
L
EN
V
ERSUS
S
IZEOF
.............................................................................................................101
U
SING
S
TRING
F
UNCTIONS
WITH
Z
STRING
P
OINTERS
.........................................................................103
T
HE
MK* 
AND
CV* S
TRING
F
UNCTIONS
.....................................................................................104
N
UMERIC
S
TRING
C
ONVERSION
F
UNCTIONS
...................................................................................107
W
IDE
S
TRING
F
UNCTIONS
.......................................................................................................108
S
TRING
O
PERATORS
..............................................................................................................109
CRT C
HARACTER
AND
S
TRING
F
UNCTIONS
....................................................................................109
Character Functions..................................................................................................109
Strtok Function..........................................................................................................113
A L
OOK
A
HEAD
..................................................................................................................115
10 Composite Data Types...........................................................................116
T
YPES
..............................................................................................................................116
Types Within Types...................................................................................................118
Type Assignments.....................................................................................................121
Pointers to Types.......................................................................................................124
Type Memory Arrays.................................................................................................127
Dynamic Arrays in Types...........................................................................................129
Function Pointers in Types........................................................................................134
Forward References..................................................................................................137
Bit Fields...................................................................................................................137
The Field Property.....................................................................................................138
T
YPE
I
NITIALIZATION
..............................................................................................................139
U
NIONS
............................................................................................................................140
Types in Unions.........................................................................................................141
Unions in Types.........................................................................................................142
A L
OOK
A
HEAD
..................................................................................................................144
9
11 Symbolic Constants...............................................................................145
#D
EFINE
AS
A
C
ONSTANT
.......................................................................................................145
T
HE
C
ONST
K
EYWORD
...........................................................................................................146
C
ONST
V
ERSUS
#D
EFINE
.......................................................................................................146
E
NUMERATIONS
....................................................................................................................146
A L
OOK
A
HEAD
..................................................................................................................147
12 Arrays..................................................................................................149
O
NE
-D
IMENSIONAL
A
RRAYS
.....................................................................................................149
One-Dimensional Array Indexes................................................................................149
T
WO
-D
IMENSIONAL
A
RRAYS
.....................................................................................................150
Two-Dimensional Array Indexes................................................................................150
M
ULTI
-D
IMENSIONAL
A
RRAYS
....................................................................................................150
D
YNAMIC
A
RRAYS
.................................................................................................................152
A
RRAY
F
UNCTIONS
................................................................................................................155
A
RRAYS
OF
T
YPES
................................................................................................................158
A
RRAYS
IN
T
YPES
.................................................................................................................162
A
RRAY
I
NITIALIZATION
............................................................................................................166
T
YPE
A
RRAY
I
NITIALIZATION
......................................................................................................168
CRT A
RRAY
F
UNCTIONS
.........................................................................................................170
U
SING
THE
-
EXX
C
OMPILER
S
WITCH
............................................................................................172
A L
OOK
A
HEAD
..................................................................................................................173
13 Date and Time Functions.......................................................................174
I
NTRINSIC
D
ATE
AND
T
IME
F
UNCTIONS
.........................................................................................174
E
XTENDED
D
ATE
AND
T
IME
F
UNCTIONS
........................................................................................176
DateAdd Function......................................................................................................176
DateDiff Function......................................................................................................180
DatePart Function.....................................................................................................181
DateSerial Function...................................................................................................183
DateValue Function...................................................................................................184
Day Function.............................................................................................................185
Hour Function............................................................................................................185
Minute Function........................................................................................................187
Month Function.........................................................................................................187
MonthName Function................................................................................................187
Now Function............................................................................................................188
Second Function........................................................................................................188
TimeSerial Function...................................................................................................189
10
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