1. Constant Functions
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Can someone explain to me the concepts of a function and a constant?
thenk yew,
------Thomas
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<DIV><FONT face=3DArial size=3D2>Can someone explain to me the concepts =
of a=20
function and a constant?</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>thenk yew,</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>------Thomas</FONT></DIV>
<DIV> </DIV>
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2. Re: Constant Functions
- Posted by John Coonrod <jc at THP.ORG>
Aug 23, 2000
-
Last edited Aug 24, 2000
A constant is a variable whose value cannot be changed once it is set.
A function is a procedure that returns a value - like in math, sin(x)
returns a value.
===== Original Message from Euphoria Programming for MS-DOS
<EUPHORIA at LISTSERV.MUOHIO.EDU> at 8/23/00 10:09 pm
>Can someone explain to me the concepts of a function and a constant?
>
>thenk yew,
>
>------Thomas
3. Re: Constant Functions
- Posted by Wayne Overman <euman at BELLSOUTH.NET>
Aug 23, 2000
-
Last edited Aug 24, 2000
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The only constant in life, is death.....
("from StarTrek Generations")=20
Seriously, A constant is something that never changes,
it always remains the same....thereby the meaning
CONSTANT.
A Function is usefull when trying to figure something out.
* return a (value or text) from the user, calculate etc.
you need to feed in info massage that info and
return something of use.=20
In the attached file you'll find lots of thing
constants
functions
procedures
file I/O
user I/O
setting up graphics modes
palette utility
display of various boxes
it's pretty loaded but isn't very functional
I'll leave that up to you....
----- Original Message -----=20
From: Paul Kerslake=20
To: EUPHORIA at LISTSERV.MUOHIO.EDU=20
Sent: Wednesday, August 23, 2000 10:09 PM
Subject: Constant Functions
Can someone explain to me the concepts of a function and a constant?
thenk yew,
------Thomas
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<DIV><FONT face=3DArial size=3D2>The only constant in life, is=20
death.....</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>("from StarTrek Generations") =
</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Seriously, A constant is something that =
never=20
changes,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>it always remains the same....thereby =
the=20
meaning</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>CONSTANT.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>A Function is usefull when trying to =
figure=20
something out.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>* return a (value =
or text) from the user,=20
calculate etc.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>you need to feed in info massage that =
info=20
and</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>return something of =
use.</FONT> </DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>In the attached file you'll find lots =
of=20
thing</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>constants</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>functions</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>procedures</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>file I/O</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>user I/O</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>setting up graphics modes</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>palette utility</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>display of various boxes</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>it's pretty loaded but isn't very=20
functional</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>I'll leave that up to =
you....</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A title=3Dpaulk at UNISERVE.COM href=3D"mailto:paulk at UNISERVE.COM">Paul =
Kerslake</A>=20
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3DEUPHORIA at LISTSERV.MUOHIO.EDU=20
=
</A>=20
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Wednesday, August 23, =
2000 10:09=20
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Constant =
Functions</DIV>
<DIV><BR></DIV>
<DIV><FONT face=3DArial size=3D2>Can someone explain to me the =
concepts of a=20
function and a constant?</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>thenk yew,</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>------Thomas</FONT></DIV>
<DIV> </DIV>
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4. Re: Constant Functions
- Posted by Irv <irv at ELLIJAY.COM>
Aug 23, 2000
-
Last edited Aug 24, 2000
On Wed, 23 Aug 2000, John Coonrod wrote:
> A constant is a variable whose value cannot be changed once it is set.
>
> A function is a procedure that returns a value - like in math, sin(x)
> returns a value.
To elaborate just a bit:
A constant in most languages can contain a single value:
pi = 3.1415,
or
name = "Joe Blo"
however, in Euphoria, constants can be that, or any arbitrarily complex
object:
constant first_release = { "Irv Mullins", "irv at ellijay.com", 1.0, 12.99 }
where first_release[1] = my name
first_release[2] = my e-mail
first_release[3] = version # 1.0
first_release[4] = price ($12.99)
These values are fixed. Any attempt to change them within the program
will cause an error.
Likewise, functions can accept, act upon, and return arbitrarily complex
objects:
function upgrade(object release)
release[3] += .1
release[4] += 2.00
return release
end function
obect newrelease
newrelease = upgrade(first_release)
After this call, everything in newrelease is the same as was in first_release,
except the version is now 1.1 and the price is 14.99
Regards,
Irv
5. Re: Constant Functions
- Posted by "Hawke'" <mikedeland at NETZERO.NET>
Aug 23, 2000
-
Last edited Aug 24, 2000
>Can someone explain to me the concepts of a function and a constant?
>thenk yew,
>------Thomas
to further explain these concepts, beyond what was replied so far....
try this as an example:
-------------------------------------------
constant PI = 3.14159 --that is now a fixed value assigned to the word
'PI'
function ComputeCircleArea(atom radius)
atom area
area = PI * radius * radius --pi * R^2
return area -- a function must return a value of some sort
-- be that a number or a sequence
end function
--------------------------------------------
hope this helps --Hawke'
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