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boundary="------------kNtDSMCgvWO8ZyGpCsFgDo6s" Message-id: Date: Sun, 4 Feb 2024 07:51:55 -0800 MIME-version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: for loop 'bad math expression' Content-language: en-US To: zsh-users@zsh.org References: <4c14e191-0605-4492-9f67-9a5b35ef132b@eastlink.ca> <4da0eeb4-4589-4c5d-9b89-a1a22209e18e@eastlink.ca> <7ccf5b82-a37d-47b5-a700-fb1096ab495c@eastlink.ca> <0875ffd7-e3a4-4ddc-9c4b-47e2c593ea4c@eastlink.ca> From: Ray Andrews In-reply-to: X-Seq: 29626 Archived-At: X-Loop: zsh-users@zsh.org Errors-To: zsh-users-owner@zsh.org Precedence: list Precedence: bulk Sender: zsh-users-request@zsh.org X-no-archive: yes List-Id: List-Help: , List-Subscribe: , List-Unsubscribe: , List-Post: List-Owner: List-Archive: This is a multi-part message in MIME format. --------------kNtDSMCgvWO8ZyGpCsFgDo6s Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 2024-02-03 18:05, Lawrence Velázquez wrote: > % var=abc > > % unset abc > % print -- $((var)) > 0 > > % abc=1 > % print -- $((var)) > 1 > > % abc=1+1 > % typeset -p abc > typeset abc=1+1 > % print -- $((var)) > 2 > > % abc='1.0 * PPID / SECONDS - RANDOM' > % typeset -p abc > typeset abc='1.0 * PPID / SECONDS - RANDOM' > % print -- $((var)) > -10080.313725490196 > That astonishes me.  I've never heard of any such thing.  Nobody tells you these things. % var=abc; print -- $var abc % abc=1; print -- $((var)) 1 # abc was a string, now it's the name of an integer: % let abc+=3; print -- $((var)) 3 # var still wants to be scalar: % var+=3; print -- $var abc3 # So once var has been touched directly the link to abc is broken: % abc+=2; print -- $((var)) 0 % abc=2; print -- $((var)) 0 ... I suppose there's a good reason for it, but that leaves me dumbfounded. % Sonnet_1='From_fairest_flowers_we_desire_increase'; print -- $Sonnet_1 From_fairest_flowers_we_desire_increase % From_fairest_flowers_we_desire_increase=1 % print -- $((Sonnet_1)) 1 ... ok ... Anyway, the lesson is just not to assign a glob expansion to an integer.  Never, ever.  Sorry for the trouble gentlemen. --------------kNtDSMCgvWO8ZyGpCsFgDo6s Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit

On 2024-02-03 18:05, Lawrence Velázquez wrote:
	% var=abc

	% unset abc
	% print -- $((var))
	0

	% abc=1
	% print -- $((var))
	1

	% abc=1+1
	% typeset -p abc
	typeset abc=1+1
	% print -- $((var))
	2

	% abc='1.0 * PPID / SECONDS - RANDOM'
	% typeset -p abc
	typeset abc='1.0 * PPID / SECONDS - RANDOM'
	% print -- $((var))
	-10080.313725490196

That astonishes me.  I've never heard of any such thing.  Nobody tells you these things.

% var=abc; print -- $var
abc

% abc=1; print -- $((var))
1

# abc was a string, now it's the name of an integer:
% let abc+=3; print -- $((var))
3

# var still wants to be scalar:
% var+=3; print -- $var
abc3

# So once var has been touched directly the link to abc is broken:
% abc+=2; print -- $((var))
0

% abc=2; print -- $((var))
0

... I suppose there's a good reason for it, but that leaves me dumbfounded.

% Sonnet_1='From_fairest_flowers_we_desire_increase'; print -- $Sonnet_1
From_fairest_flowers_we_desire_increase

% From_fairest_flowers_we_desire_increase=1        

% print -- $((Sonnet_1))
1

... ok ...

Anyway, the lesson is just not to assign a glob expansion to an integer.  Never, ever.  Sorry for the trouble gentlemen.







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