Re: Definition of terms
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Thomas,
Here are some examples:
constant TRUE=3D1
constant FALSE=3D0
so we can write:
if flag=3DTRUE then . . .
rather than
if flag=3D1 then . . .
A constant simply gives a symbolic name to a value, which is useful for =
the readability of the code, but makes no differnce to the running of =
the program. A constant is given its value when it is defined and that =
value may not be changed. By contrast, a variable's value may change =
many times during a program:
atom x,y
x=3D5
y=3D7
x+=3D1
x=3D(3-x)+(y/2)
y*=3D4
Procedures and functions are both examples of subroutines (also known as =
routines). These are like small programs of their own which accept =
input (the parameters), and in the case of functions produce output (the =
return value). Procedures ndo not return a value.
function max(object x, object y)
if compare(x,y)=3D1 then
return x
else
return y
end if
end function
procedure print_to_screen(sequence text,integer row, integer column, =
integer t_color,integer b_color)
position(row,column)
text_color(t_color)
bk_color(b_color)
puts(1,text)
end rpocedure
Procedurers are invoked by the procedure name and the parameters for =
example:
print_to_screen("This is a procedure",5,25,BRIGHT_WHITE,BLUE)
Functions are used in assignments, if statements, and while statements:
z=3Dmax(x,y)
w=3D{max(x,y),max(p,q)}
if max(x,y)>10 then . . .
while max(x,y)<5 do=20
Procedures are used to allow the actions in their code to be performed =
from anywhere in the program without having to repeat the code. =
Functions are primarily used to compute a value from anywhere in the =
program without repeating code, but can also perform actions. For =
example, I could have written print_to_screen as a function, done some =
error checking for valid parameters and returned TRUE or FALSE (as =
defined above) to indicate whether the printing was successful or not. =
In that case it would be used like this:
if print_to_screen("This is a function",5,25,BRIGHT_WHITE,BLUE)=3DTRUE =
then
-- Printed correctly
else
-- Printing error
end if
-- Mike Nelson
----- Original Message -----=20
From: Paul Kerslake=20
To: EUPHORIA at LISTSERV.MUOHIO.EDU=20
Sent: Sunday, September 03, 2000 5:42 PM
Subject: Definition of terms
Can someone tell me and give me an example of; a constant, a procedure =
and a function. Also, I'd like to know what the difference between " and =
' is.
8-)
puts(1,"Thanks")
--Thomas
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<DIV><FONT size=3D2>Thomas,</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>Here are some examples:</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>constant TRUE=3D1</FONT></DIV>
<DIV><FONT size=3D2>constant FALSE=3D0</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>so we can write:</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>if flag=3DTRUE then . . .</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>rather than</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>if flag=3D1 then . . .</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>A constant simply gives a symbolic name to a value, =
which is=20
useful for the readability of the code, but makes no differnce to the =
running of=20
the program. A constant is given its value when it is defined and =
that=20
value may not be changed. By contrast, a variable's value may =
change many=20
times during a program:</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>atom x,y</FONT></DIV>
<DIV><FONT size=3D2>x=3D5</FONT></DIV>
<DIV><FONT size=3D2>y=3D7</FONT></DIV>
<DIV><FONT size=3D2>x+=3D1</FONT></DIV>
<DIV><FONT size=3D2>x=3D(3-x)+(y/2)</FONT></DIV>
<DIV><FONT size=3D2>y*=3D4</FONT></DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>Procedures and functions are both examples of =
subroutines=20
(also known as routines). These are like small programs of their =
own which=20
accept input (the parameters), and in the case of functions produce =
output (the=20
return value). Procedures ndo not return a value.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>function max(object x, object y)</FONT></DIV>
<DIV><FONT size=3D2> if compare(x,y)=3D1 =
then</FONT></DIV>
<DIV><FONT size=3D2> return =
x</FONT></DIV>
<DIV><FONT size=3D2> else</FONT></DIV>
<DIV><FONT size=3D2> return =
y</FONT></DIV>
<DIV><FONT size=3D2> end if</FONT></DIV>
<DIV><FONT size=3D2>end function</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>procedure print_to_screen(sequence text,integer row, =
integer=20
column, integer t_color,integer b_color)</FONT></DIV>
<DIV><FONT size=3D2> position(row,column)</FONT></DIV>
<DIV><FONT size=3D2> text_color(t_color)</FONT></DIV>
<DIV><FONT size=3D2> bk_color(b_color)</FONT></DIV>
<DIV><FONT size=3D2> puts(1,text)</FONT></DIV>
<DIV><FONT size=3D2>end rpocedure</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>Procedurers are invoked by the procedure name and =
the=20
parameters for example:</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>print_to_screen("This is a=20
procedure",5,25,BRIGHT_WHITE,BLUE)</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>Functions are used in assignments, if statements, =
and while=20
statements:</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>z=3Dmax(x,y)</FONT></DIV>
<DIV><FONT size=3D2>w=3D{max(x,y),max(p,q)}</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>if max(x,y)>10 then . . .</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>while max(x,y)<5 do </FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>Procedures are used to allow the actions in their =
code to be=20
performed from anywhere in the program without having to repeat the =
code. =20
Functions are primarily used to compute a value from anywhere in the =
program=20
without repeating code, but can also perform actions. For example, =
I could=20
have written print_to_screen as a function, done some error checking for =
valid=20
parameters and returned TRUE or FALSE (as defined above) to indicate =
whether the=20
printing was successful or not. In that case it would be used like=20
this:</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>if print_to_screen("This is a=20
function",5,25,BRIGHT_WHITE,BLUE)=3DTRUE then</FONT></DIV>
<DIV><FONT size=3D2> -- Printed=20
correctly</FONT></DIV>
<DIV><FONT size=3D2>else</FONT></DIV>
<DIV><FONT size=3D2> -- Printing=20
error</FONT></DIV>
<DIV><FONT size=3D2>end if</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>-- Mike Nelson</FONT></DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: =
0px; PADDING-LEFT: 5px; PADDING-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 href=3D"mailto:paulk at UNISERVE.COM" title=3Dpaulk at UNISERVE.COM>Paul =
Kerslake</A>=20
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A=20
href=3D"mailto:EUPHORIA at LISTSERV.MUOHIO.EDU"=20
title=3DEUPHORIA at LISTSERV.MUOHIO.EDU>EUPHORIA at LISTSERV.MUOHIO.EDU</A> =
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Sunday, September 03, =
2000 5:42=20
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Definition of =
terms</DIV>
<DIV><BR></DIV>
<DIV><FONT face=3DArial size=3D2>Can someone tell me and give me an =
example of; a=20
constant, a procedure and a function. Also, I'd like to know what the=20
difference between " and ' is.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>8-)</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>puts(1,"Thanks")</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>--Thomas</FONT></DIV>
<DIV> </DIV>
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