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[smallbasic/en] New article about SmallBASIC (#2311)

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* [smallbasic/en] new article

* [smallbasic/en] new article
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---
language: SmallBASIC
filename: learnsmallbasic.bas
contributors:
- ["Chris Warren-Smith", "http://smallbasic.sourceforge.net"]
---
## About
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.
## Development
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.
Versions of SmallBASIC have been made for a number of early hand held devices including Franklin eBookman and the Nokia 770. Also various desktop releases 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.
In late 2000's a large corporation released a BASIC like programming environment with a similar sounding name. SmallBASIC is not related to this other project.
```
REM This is a comment
' and this is also a comment
REM print text
print "hello"
? "? is short for PRINT"
REM Control structures
FOR index = 0 TO 10 STEP 2
? "This is line number "; index
NEXT
J=0
REPEAT
J++
UNTIL J=10
WHILE J>0
J--
WEND
REM Select case statement
Select Case "Cool"
Case "null", 1,2,3,4,5,6,7,8,"Cool","blah"
Case "Not cool"
PRINT "Epic fail"
Case Else
PRINT "Fail"
End Select
REM catching errors with TRY/CATCH
Try
fn = Freefile
Open filename For Input As #fn
Catch err
Print "failed to open"
End Try
REM User defined subs and functions
func add2(x,y)
' variables may be declared as local within the scope of a SUB or FUNC
local K
k = "k will cease to exist when this FUNC returns"
add2=x+y
end
Print add2(5,5)
sub print_it(it)
print it
end
print_it "IT...."
REM Display lines and pixels
At 0,ymax/2+txth("Q")
Color 1: ? "sin(x)":
Color 8: ? "cos(x)":
Color 12: ? "tan(x)"
Line 0,ymax/2,xmax,ymax/2
For i=0 to xmax
Pset i,ymax/2-sin(i*2*pi/ymax)*ymax/4 color 1
Pset i,ymax/2-cos(i*2*pi/ymax)*ymax/4 color 8
Pset i,ymax/2-tan(i*2*pi/ymax)*ymax/4 color 12
Next
showpage
REM SmallBASIC is great for experimenting with fractals and other interesting effects
Delay 3000
Randomize
ff = 440.03
For j = 0 to 20
r = rnd * 1000 % 255
b = rnd * 1000 % 255
g = rnd * 1000 % 255
c = rgb(r,b,g)
ff += 9.444
for i=0 to 25000
f += ff
x = min(xmax, -x + cos(f*i))
y = min(ymax, -y + sin(f*i))
pset x, y color c
if (i%1000==0) then
showpage
fi
next
Next j
REM For computer historians, SmallBASIC can run programs
REM found in early computer books and magazines, for example:
10 LET A=9
20 LET B=7
30 PRINT A*B
40 PRINT A/B
PAUSE
```
## Articles
* [Getting started](http://smallbasic.sourceforge.net/?q=node/1573)
* [Welcome to SmallBASIC](http://smallbasic.sourceforge.net/?q=node/838)
## GitHub
* [Source code](https://github.com/smallbasic/SmallBASIC)
* [Reference snapshot](http://smallbasic.github.io/)