[Tcl-bugs] [Bug #119153] "!" operator can't handle string booleans

[<no...@so...>]

Bug #119153, was updated on 2000-Oct-25 22:02
Here is a current snapshot of the bug.

Project: Tcl
Category: Compiler and Objects
Status: Open
Resolution: None
Bug Group: 8.1b1
Priority: 5
Summary: "!" operator can't handle string booleans

Details: OriginalBugID: 1194 RFE
Version: 8.1b1
SubmitDate: '1999-02-11'
LastModified: '1999-12-03'
Severity: LOW
Status: Assigned
Submitter: pat
ChangedBy: hobbs
RelatedBugIDs: 616
OS: Linux
OSVersion: 2.0.35
Machine: Other
FixedDate: '2000-10-25'
ClosedDate: '2000-10-25'


Name:
Steve McAndrewSmith

ReproducibleScript:
# These all work fine ...
set b 1
if { $b } { puts "ooga" }

set b 0
if { ! $b } { puts "ooga" }

set b yes
if { $b } { puts "ooga" }

set b no
if { $b } { puts "no ooga" } else { puts "ooga" }

if { ($b && $b) || $b } { puts "ooga ooga ooga" }

# This produces an error.:  can't use non-numeric string as operand of "!"
if { ! $b } { puts "GAKK!" }

ObservedBehavior:
When using string boolean values (e.g. "true", "false", "yes", "no") in if expressions, the negation operator ("!") does not recognize the strings as boolean values.  Only "0" and "1" are correctly accepted.  It gives the following error:

  can't use non-numeric string as operand of "!" 

However, both "&&" and "||" (and probably others) accept these boolean strings correctly.

DesiredBehavior:
"!true",  "!false", "!yes", and "!no" should all evaluate correctly.



This is not the defined behavior.  03/23/1999 18:13 - surles -

Follow-Ups:

Date: 2000-Nov-24 07:14
By: dkf

Comment:
Added test to detect this.
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For detailed info, follow this link:
http://sourceforge.net/bugs/?func=detailbug&bug_id=119153&group_id=10894