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Wed, 24 Mar 2021 19:37:46 -0700 (PDT) MIME-Version: 1.0 References: <22260ea8-adec-6e16-9250-c2c2ab31fcba@eastlink.ca> <20210325013641.GE18178@tarpaulin.shahaf.local2> <0421525d-8304-6142-04bd-4f564ca043c0@eastlink.ca> In-Reply-To: <0421525d-8304-6142-04bd-4f564ca043c0@eastlink.ca> From: Bart Schaefer Date: Wed, 24 Mar 2021 19:37:35 -0700 Message-ID: Subject: Re: forcing float arithmetic. To: Ray Andrews Cc: Zsh Users Content-Type: text/plain; charset="UTF-8" X-Seq: 26598 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: Archived-At: On Wed, Mar 24, 2021 at 6:45 PM Ray Andrews wrote: > > I'd think of it as polite. Just now I'm doing this: > > (( divided = sum * 1.0 / level )) > > ... and it really does seem belabored. Doc, Arithmetic Evaluation section: Users should beware that, in common with many other programming languages but not software designed for calculation, the evaluation of an expression in zsh is taken a term at a time and promotion of integers to floating point does not occur in terms only containing integers. A typical result of this is that a division such as 6/8 is truncated, in this being rounded towards 0. The FORCE_FLOAT shell option can be used in scripts or functions where floating point evaluation is required throughout.