possible bug or design ?

[moricode]

pb 5.72

No Error:

Code: Select all

b=456
A$="ERROR Line "+ b + " : [] () Mismatch "
Debug A$

show syntax Error:

Code: Select all

b=456
A$=b + "ERROR Line "+ b + " : [] () Mismatch "
Debug A$

so ?

[Demivec]

In the help manual under the topic of "Variables, Types and Operators" there is a description next to the '+' operator which reads:

With strings the '+' is also valid for combining the contents of two strings, where the result will be assigned to the string on the LHS with the '=' operator or will be directly stored into the string on the LHS. Numeric values are also accepted for combination with a string. It will behave like using Str(), Str() or StrD() with their defaults for the optional parameters

The string must come first before the concatenation operator for the number to not need Str(), Str() or StrD().

Code: Select all

;The following are all equivalent
V = 345
A$ = " Value = "
B$ = A$ + Str(V)
B$ = A$ + V
B$ = A$ + 345
Debug B$

; The following is not allowed because a string has to come first:
; B$ = V + A$;

;It can be written as follows:
B$ = Str(V) + A$
;or alternatively as
B$ = "" + V + A$
Debug B$

[mk-soft]

Code: Select all

a=100
Debug "" + a + "% right"

[moricode]

No Error:

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#         abc        =            $       abc 
#         abc123     =            $       123abc 

abc    +    #         abc  +     #         abc123     +     123      +   $       123abc 

[moricode]

show Error:

Code: Select all

abc     $    =       "aghf"

[#NULL]

No Error:

That's because in this case, there are no strings involved at all.
abc is not previously declared, so becomes implicit integer, then come 2 numerical constants #abc and #abc123, then decimal number 123 and then hex number $123abc, so no strings involved.

[#NULL]

show Error:

The $ is part of the string variable name, you can't put spaces within the identifier name, and there is no other valid way PB could interpret this. In some case like constants it might just work but is not defined or supported by the language.

[moricode]

show Error:

The $ is part of the string variable name, you can't put spaces within the identifier name, and there is no other valid way PB could interpret this. In some case like constants it might just work but is not defined or supported by the language.

so the space should not allow at all , or it will come to confuse if write code like that

[moricode]

No error :

Code: Select all

p    **p


p    *       *P

Error :

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P    *       *    P     ; Error

[moricode]

all no error:

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Debug Bool(a    <          >    b)
Debug Bool(a    >          =    b)
Debug Bool(a    =          <    b)
Debug Bool(a    >          >    b)
Debug Bool(a    <          <    b)

[Little John]

No error :

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p    **p


p    *       *P

Error :

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P    *       *    P     ; Error

So what?
p is an integer variable, *p is a pointer variable.
p **p ist the product of those variables, and so is p * *P.
P * * P is invalid syntax, because two consecutive multiplication signs are not allowed.

[Fred]

all no error:

Code: Select all

Debug Bool(a    <          >    b)
Debug Bool(a    >          =    b)
Debug Bool(a    =          <    b)
Debug Bool(a    >          >    b)
Debug Bool(a    <          <    b)

I agree than operands shouldn't be allowed with space when it's a 2 chars operand.

[AZJIO]

moricode
In all cases, you are not creating an incorrect interpretation of the code. It is better to have a separate program for correcting artificially invented errors than to build this into the compiler.

[moricode]

No error :

Code: Select all

p    **p


p    *       *P

Error :

Code: Select all

P    *       *    P     ; Error

So what?
p is an integer variable, *p is a pointer variable.
p **p ist the product of those variables, and so is p * *P.
P * * P is invalid syntax, because two consecutive multiplication signs are not allowed.

oh yes, you are right , i agree with you , this is a good example to show you that , all previous post example should remove space and not allow extra space in the between , so it remain language consistency and readability, and reduce human errors .

i bet you already see this and never do some mistake on coding , good luck .


Thanks guy