Passing character ch to make-string

Passing character ch to make-string

[jai-bholeki via Users list for the GNU Emacs text editor]

How can I pass a character ch to make-string

(make-string 8 ?ch)

Re: Passing character ch to make-string

[Jean Louis]

* jai-bholeki via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org> [2020-11-01 20:48]:
> How can I pass a character ch to make-string
> 
> (make-string 8 ?ch)

You would always read function documentation by using: C-h f

C-h f make-string RET

it would give:

make-string is a built-in function in ‘C source code’.

(make-string LENGTH INIT &optional MULTIBYTE)

  Other relevant functions are documented in the string group.
  Probably introduced at or before Emacs version 1.12.
  This function does not change global state, including the match data.

Return a newly created string of length LENGTH, with INIT in each element.
LENGTH must be an integer.
INIT must be an integer that represents a character.
If optional argument MULTIBYTE is non-nil, the result will be
a multibyte string even if INIT is an ASCII character.

So now we see that INIT is integer that represents a character.

If character is = you may place cursor on character and do: M-x
describe-char and you would see the integer for character like
codepoint 61.

Then you apply character in (make-string 8 61) to get string like
======== 

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Re: Passing character ch to make-string

[jai-bholeki]

I did not understand the documentation.  Now I got more confused.
Is there a function I can use that would not require me to hard code
the number?




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‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Sunday, 1 November 2020 18:55, Jean Louis <bugs@gnu.support> wrote:

> -   jai-bholeki via Users list for the GNU Emacs text editor help-gnu-emacs@gnu.org [2020-11-01 20:48]:
>
> > How can I pass a character ch to make-string
> > (make-string 8 ?ch)
>
> You would always read function documentation by using: C-h f
>
> C-h f make-string RET
>
> it would give:
>
> make-string is a built-in function in ‘C source code’.
>
> (make-string LENGTH INIT &optional MULTIBYTE)
>
> Other relevant functions are documented in the string group.
> Probably introduced at or before Emacs version 1.12.
> This function does not change global state, including the match data.
>
> Return a newly created string of length LENGTH, with INIT in each element.
> LENGTH must be an integer.
> INIT must be an integer that represents a character.
> If optional argument MULTIBYTE is non-nil, the result will be
> a multibyte string even if INIT is an ASCII character.
>
> So now we see that INIT is integer that represents a character.
>
> If character is = you may place cursor on character and do: M-x
> describe-char and you would see the integer for character like
> codepoint 61.
>
> Then you apply character in (make-string 8 61) to get string like
>
> =========================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================
>
> --
>
> There are 50 messages yet in my incoming mailbox.

Re: Passing character ch to make-string

[Jean Louis]

* jai-bholeki <jai-bholeki@protonmail.com> [2020-11-01 21:21]:
> I did not understand the documentation.  Now I got more confused.
> Is there a function I can use that would not require me to hard code
> the number?

(make-string 10 (string-to-char "="))

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Re: Passing character ch to make-string

[Stefan Kangas]

Jean Louis <bugs@gnu.support> writes:

> (make-string 10 (string-to-char "="))

Also known as:

    (make-string 10 ?=)

Re: Passing character ch to make-string

[Jean Louis]

* Stefan Kangas <stefankangas@gmail.com> [2020-11-01 21:41]:
> Jean Louis <bugs@gnu.support> writes:
> 
> > (make-string 10 (string-to-char "="))
> 
> Also known as:
> 
>     (make-string 10 ?=)

Until now I did not know. Thanks.

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Re: Passing character ch to make-string

[jai-bholeki]

> >     (make-string 10 ?=)

Good heaven, I like to pass a character from a variable, ch say



‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Sunday, 1 November 2020 19:48, Jean Louis <bugs@gnu.support> wrote:

> -   Stefan Kangas stefankangas@gmail.com [2020-11-01 21:41]:
>
> > Jean Louis bugs@gnu.support writes:
> >
> > > (make-string 10 (string-to-char "="))
> >
> > Also known as:
> >
> >     (make-string 10 ?=)
> >
>
> Until now I did not know. Thanks.
>
> ------------------------------------
>
> There are 50 messages yet in my incoming mailbox.

RE: Passing character ch to make-string

[Drew Adams]

> > >     (make-string 10 ?=)
> 
> Good heaven, I like to pass a character from a variable, ch say

Good earth -

(setq ch  ?=)
(make-string ch)

RE: Passing character ch to make-string

[Drew Adams]

> > > >     (make-string 10 ?=)
> >
> > Good heaven, I like to pass a character from a variable, ch say
> 
> Good earth -
> 
> (setq ch  ?=)
> (make-string ch)

Sorry - (make-string 42 ch).

RE: Passing character ch to make-string

[jai-bholeki]

Fantastic

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Sunday, 1 November 2020 20:03, Drew Adams <drew.adams@oracle.com> wrote:

> > > > >     (make-string 10 ?=)
> > > > >
> > >
> > > Good heaven, I like to pass a character from a variable, ch say
> >
> > Good earth -
> > (setq ch ?=)
> > (make-string ch)
>
> Sorry - (make-string 42 ch).