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Hello,
Excerpts from AFL Language Reference part
of User's Guide:
Parentheses (open ( and
close ) ) group expressions, isolate conditional expressions and indicate
function calls and function parameters:d = c * ( a + b ) /* override normal
precedence */a= (b AND c) OR (d AND e) /* conditional expression
*/func() /* function call no arguments */
(...)
Accessing array elements: [ ] - subscript operator
An array identifier followed by an expression in square brackets ([ ]) is a
subscripted representation of an element of an array object.
arrayidentifier [ expression ]
It represents the value of expression-th element of array.
BarCount constant gives the number of bars in array (such as
Close, High, Low, Open, Volume, etc). Array elements are numbered from 0 (zero)
to BarCount-1.
To get the first bar you can use array[ 0 ], to get the last bar of array you
can use array[ BarCount - 1 ];
For example:
Close[ 5 ];Represents the sixth element (bar) of the close
array.
Close[ 0 ];Represents the very first available bar of the
close array.
High[ BarCount - 1 ];Represents the last bar of High array.
Compound statements (Blocks)
A compound statement consists of zero or more statements enclosed in curly
braces ({ }). A compound statement can be used anywhere a statement is expected.
Compound statements are commonly called “blocks.”
{
statement1;
....
statementN;
}
(this is 'borrowed' from C language, users of other programming languages are
used to use BEGIN for { and END for } )
if( Amount > 100 ){
_TRACE("Amount above 100");Balance +=
Amount;
}else Balance -= Amount;
(..)
++ Post-increment/pre-increment(i++ works like i = i + 1)
-- Post-decrement/pre-decrement(i-- works like i = i - 1 )
A few words about increment/decrement operators. There are two kinds of
them: postfix and prefix.
The unary operators (++ and --) are called “prefix” increment or decrement
operators when the increment or decrement operators appear before the operand.
Postfix increment and decrement has higher precedence than prefix increment and
decrement operators. When the operator appears before its operand, the operand
is incremented or decremented and its new value is the result of the
expression.
i = 5;
j = ++i; // i will be incremented first and result (number 6) will be
assigned to j.
The result of the postfix increment or decrement operation is the value of
the postfix-expression before the increment or decrement operator is applied.
The type of the result is the same as that of the postfix-expression but is no
longer an l-value. After the result is obtained, the value of the operand is
incremented (or decremented).
i = 5;
j = i++; // j will be assigned the value of 5 (before incrementation) and
then i will be incremented to 6.
Best regards,Tomasz Janeczkoamibroker.com
<BLOCKQUOTE
>
----- Original Message -----
<DIV
>From:
Lionel
Issen
To: <A title=amibroker@xxxxxxxxxxxxxxx
href="">amibroker@xxxxxxxxxxxxxxx
Sent: Saturday, August 30, 2003 2:17
AM
Subject: RE: [amibroker] AFL brackets and
parentheses
Please send me the page
numbers. I did look in this section and found some examples, I also need
the definitions of when to use them. I find an example without the
explanation is a bit inadequate.
Lionel
<FONT
face=Tahoma size=2>-----Original Message-----From: wavemechanic
[mailto:wd78@xxxxxxxxxxxx] Sent: Friday, August 29, 2003 5:21
PMTo: <A
href="">amibroker@xxxxxxxxxxxxxxxSubject:
Re: [amibroker] AFL brackets and parentheses
Lionel:
Most if not all of your questions are handled in the
AFL Reference Manual under Help|Contents|AmiBroker Formula Language|AFL
Reference Manual.
Bill
<BLOCKQUOTE
>
----- Original Message -----
<DIV
>From:
Lionel
Issen
To: <A title=amibroker@xxxxxxxxxxxxxxx
href="">amibroker@xxxxxxxxxxxxxxx
Sent: Friday, August 29, 2003 5:44
PM
Subject: [amibroker] AFL brackets and
parentheses
Please explain to me when
to use the different brackets that are shown in the user manual/online
help:
[ ], ( ), and { } or are
they interchangeable.
When is == used instead of
= ?
When should ++n be used
instead of n?
Thanks
Lionel
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