NUL char cannot be part of a string?

[gdelconti]

See example below:

print "ESP Basic 3.0.Alpha 69"

' let define some control character let NUL = chr(0) 'required let SOH = chr(1) 'can be any let STX = chr(2) 'can be any

print "correct with any combitation of control char but the NUL" let s = SOH & STX print asc(left(s,1)) print asc(right(s,1))

print "wrong if NUL is part of the string" let s = NUL & STX print asc(left(s,1)) print asc(right(s,1))

[oldbodd]

Espbasic is a program written in a programming language created by people who thought it was a good idea to indicate the end of a string with a special character and picked chr(0) for that character. So when you put a chr(0) in a string, the program reads the string till it comes to that Chr(0) and treats it as end of string rather than a character with a value of 0 .. if you see what I mean.... I'm sure this has many advantages but strongly suspect that the phrase buffer overrun is not entirely unrelated to this type of thinking.... Some systems use two bytes to represent one....

[gdelconti]

I thought this was "C"-related. BTW, other people from different country in more recent times thought that using NUL char in Relay deactivation command was a good idea too ;-) http://www.smoke.com.au/museum/?p=379

Of course with ESPbasic there is an obvious workaround:

[R1OFF] ' A0 and A1 defined elsewhere serialprint chr(A0) serialprint chr(01) serialprint chr(00) serialprint chr(A1) return