Mixing strings and integer !?!?!

[StarBootics]

Hello everyone;

Is this following code normal :

Code: Select all

; <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
; Project name : Something weird about string
; File Name : Mixing strings and integer.pb
; File version: 1.0.0
; Programming : OK
; Programmed by : StarBootics
; Date : 19-05-2020
; Last Update : 19-05-2020
; PureBasic code : V5.72
; Platform : Linux
; <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
;
; Is this a regression or a normal behaviour
; Mixing string and integers without compiler
; complaining about different types of vars !?!?!
;
; <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

Define pointer.l

MyString00.s = "Something " + *pointer + " else "
MyString01.s = " Something " + pointer + " else "

pointer = 1

MyString03.s = MyString00 + pointer + MyString01 

Debug MyString00
Debug MyString01
Debug MyString03

; <<<<<<<<<<<<<<<<<<<<<<<
; <<<<< END OF FILE <<<<<
; <<<<<<<<<<<<<<<<<<<<<<<

Something 0 else
Something 0 else
Something 0 else 1 Something 0 else

From my perspective this code shouldn't work at all but it does.

Best regards
StarBootics

[breeze4me]

It is a feature added quite a long time ago.

14th February 2013 : Version 5.10
- Added: autocast of numeric values when string are involved, allowing to concatenate string and numeric in constants

[netmaestro]

I must confess I've never been able to bring myself to trust it, I always use Str(). Something just seems not right about being able to code like that. Probably just me, I'm happy it's there for those who like it, which is likely most coders.

[StarBootics]

I must confess I've never been able to bring myself to trust it, I always use Str(). Something just seems not right about being able to code like that.

In my case that lead to an unexpected result due to a typo in my code.

Anyway, I will never use this feature because it appear very odd to me.

Best regards
StarBootics

[infratec]

I must confess I've never been able to bring myself to trust it, I always use Str(). Something just seems not right about being able to code like that. Probably just me, I'm happy it's there for those who like it, which is likely most coders.

+1

[Little John]

See also Cave when doing without Str()!

[Demivec]

It is documented on the Help page for Variable Types and Operators, under the '+'sign.

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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.

Example:
a$ = b$ + " more" ; Combines the content of the string "b$" with the string " more" and save this into the string "a$"
a$ + b$ ; Attach the content of the string b$ directly to the string a$. a$ = b$ + 123

[HeX0R]

I must confess I've never been able to bring myself to trust it, I always use Str(). Something just seems not right about being able to code like that.

[...]Anyway, I will never use this feature because it appear very odd to me.

Yeah, it looks and feels like using a scripting language, I only use this for quick debug phrases.

[NicTheQuick]

I like it a lot. But it would be even cooler if this would work:

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Define a.i = 5

Debug "Double: " + (a * 2)

[Marc56us]

Just remember that if it starts with a string (even an empty one) everything that follows is considered as text EXCEPT for explicit mention (by using a function)

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a = 25

; Debug a + " item"             ; error
Debug "" + a + " items"         ; 25 items

Debug "" + Sqr(a) + " items"    ; 5 items  

Debug "" + a + a + " items"     ; 2525 items
Debug "" + 25 + 25 + " items"   ; 2525 items

; Debug "" + (a+a) + " items"   ; '(' are Not allowed in string operations.

Debug "" + Str(a+a) + " items"  ; 50 items

Easy.