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132 lines
3.4 KiB
Markdown
132 lines
3.4 KiB
Markdown
---
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language: SmallBASIC
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filename: learnsmallbasic.bas
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contributors:
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- ["Chris Warren-Smith", "http://smallbasic.sourceforge.net"]
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---
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## About
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SmallBASIC is a fast and easy to learn BASIC language interpreter ideal for everyday calculations, scripts and prototypes. SmallBASIC includes trigonometric, matrices and algebra functions, a built in IDE, a powerful string library, system, sound, and graphic commands along with structured programming syntax.
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## Development
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SmallBASIC was originally developed by Nicholas Christopoulos in late 1999 for the Palm Pilot. Project development has been continued by Chris Warren-Smith since around 2005.
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Versions of SmallBASIC have been made for a number of early hand held devices including Franklin eBookman and the Nokia 770. Also various desktop versions have been released based on a variety of GUI tool-kits, some of which have become defunct. The current supported platforms are Linux and Windows based on SDL2 and Android based on NDK. A desktop command line version is also available, although not typically released in binary form.
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In around 2008 a large corporation released a BASIC like programming environment with a similar sounding name. SmallBASIC is not related to this other project.
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```
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REM This is a comment
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' and this is also a comment
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REM print text
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print "hello"
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? "? is short for PRINT"
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REM Control structures
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FOR index = 0 TO 10 STEP 2
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? "This is line number "; index
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NEXT
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J=0
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REPEAT
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J++
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UNTIL J=10
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WHILE J>0
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J--
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WEND
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REM Select case statement
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Select Case "Cool"
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Case "null", 1,2,3,4,5,6,7,8,"Cool","blah"
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Case "Not cool"
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PRINT "Epic fail"
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Case Else
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PRINT "Fail"
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End Select
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REM catching errors with TRY/CATCH
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Try
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fn = Freefile
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Open filename For Input As #fn
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Catch err
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Print "failed to open"
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End Try
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REM User defined subs and functions
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func add2(x,y)
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' variables may be declared as local within the scope of a SUB or FUNC
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local K
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k = "k will cease to exist when this FUNC returns"
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add2=x+y
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end
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Print add2(5,5)
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sub print_it(it)
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print it
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end
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print_it "IT...."
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REM Display lines and pixels
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At 0,ymax/2+txth("Q")
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Color 1: ? "sin(x)":
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Color 8: ? "cos(x)":
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Color 12: ? "tan(x)"
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Line 0,ymax/2,xmax,ymax/2
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For i=0 to xmax
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Pset i,ymax/2-sin(i*2*pi/ymax)*ymax/4 color 1
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Pset i,ymax/2-cos(i*2*pi/ymax)*ymax/4 color 8
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Pset i,ymax/2-tan(i*2*pi/ymax)*ymax/4 color 12
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Next
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showpage
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REM SmallBASIC is great for experimenting with fractals and other interesting effects
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Delay 3000
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Randomize
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ff = 440.03
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For j = 0 to 20
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r = rnd * 1000 % 255
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b = rnd * 1000 % 255
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g = rnd * 1000 % 255
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c = rgb(r,b,g)
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ff += 9.444
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for i=0 to 25000
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f += ff
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x = min(xmax, -x + cos(f*i))
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y = min(ymax, -y + sin(f*i))
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pset x, y color c
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if (i%1000==0) then
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showpage
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fi
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next
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Next j
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REM For computer historians, SmallBASIC can run programs
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REM found in early computer books and magazines, for example:
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10 LET A=9
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20 LET B=7
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30 PRINT A*B
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40 PRINT A/B
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REM SmallBASIC also has support for a few modern concepts such as JSON
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aa = array("{\"cat\":{\"name\":\"harry\"},\"pet\":\"true\"}")
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If (ismap(aa) == false) Then
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throw "not an map"
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End If
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Print aa
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PAUSE
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```
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## Articles
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* [Getting started](http://smallbasic.sourceforge.net/?q=node/1573)
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* [Welcome to SmallBASIC](http://smallbasic.sourceforge.net/?q=node/838)
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## GitHub
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* [Source code](https://github.com/smallbasic/SmallBASIC)
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* [Reference snapshot](http://smallbasic.github.io/)
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