FOR-NEXT/de - Revision history

Stefanhamburg: /* Example */

2013-02-18T22:27:32Z

Example

Stefanhamburg: /* See also */

2013-02-18T22:19:58Z

Stefanhamburg: /* Remarks */

2013-02-18T22:19:30Z

Remarks

Stefanhamburg: /* (COPIED FROM ENGLISH PAGE) = */

2013-02-18T21:49:01Z

(**COPIED FROM ENGLISH PAGE**) =

Admin: 1 revision

2013-02-15T19:14:35Z

1 revision

Admin: Created page with "= Action = Execute a block of statements a number of times. ..."

2013-02-11T17:06:18Z

Created page with "= Action = Execute a block of statements a number of times. ..."

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== (**COPIED FROM ENGLISH PAGE**) === Action =

Execute a block of statements a number of times.

 

 

= Syntax =

FOR var = start TO end [STEP value]

 

 

= Remarks =
<div style="padding: 0px; margin: 0px 0px 0px 4px;">
{| width="601" cellspacing="0" cellpadding="1" border="1" style="border: 2px solid rgb(0, 0, 0); border-spacing: 0px; border-collapse: collapse;"
|- style="vertical-align: top;"
| valign="top" width="17%" style="width: 98px; border: 1px solid rgb(0, 0, 0);" |
var

| valign="top" width="85%" style="width: 494px; border: 1px solid rgb(0, 0, 0);" |
The variable counter to use

|- style="vertical-align: top;"
| valign="top" width="17%" style="width: 98px; border: 1px solid rgb(0, 0, 0);" |
start

| valign="top" width="85%" style="width: 494px; border: 1px solid rgb(0, 0, 0);" |
The starting value of the variable var

|- style="vertical-align: top;"
| valign="top" width="17%" style="width: 98px; border: 1px solid rgb(0, 0, 0);" |
end

| valign="top" width="85%" style="width: 494px; border: 1px solid rgb(0, 0, 0);" |
The ending value of the variable var

|- style="vertical-align: top;"
| valign="top" width="17%" style="width: 98px; border: 1px solid rgb(0, 0, 0);" |
value

| valign="top" width="85%" style="width: 494px; border: 1px solid rgb(0, 0, 0);" |
The value var is increased/decreased with each time NEXT is encountered.

|}
</div>
 
<div style="padding: 0px; margin: 0px 0px 0px 11px;">
{| border="0" cellpadding="0" cellspacing="0"
|- valign="baseline" style="vertical-align: baseline;"
| width="13" | •
| For incremental loops, you must use TO.
|}
</div><div style="padding: 0px; margin: 0px 0px 0px 11px;">
{| border="0" cellpadding="0" cellspacing="0"
|- valign="baseline" style="vertical-align: baseline;"
| width="13" | •
| For decremental loops, you must use a negative step size.
|}
</div><div style="padding: 0px; margin: 0px 0px 0px 11px;">
{| border="0" cellpadding="0" cellspacing="0"
|- valign="baseline" style="vertical-align: baseline;"
| width="13" | •
| You must end a FOR structure with the NEXT statement.
|}
</div><div style="padding: 0px; margin: 0px 0px 0px 11px;">
{| border="0" cellpadding="0" cellspacing="0"
|- valign="baseline" style="vertical-align: baseline;"
| width="13" | •
| The use of STEP is optional. By default, a value of 1 is used.
|}
</div>
 

When you know in advance how many times a block of code must be executed, the FOR..NEXT loop is convenient to use.

You can exit a FOR .. NEXT loop with the EXIT FOR statement.

 

It is important that the if you use variables for START and END, that these are of the same data type. So for example:

Dim x, as byte, st as byte, ed as byte

FOR x = st TO ED ' this is ok since all variables are of the same data type

 

Dim x as Byte, st as Word, Ed as Long

FOR x = st TO ED ' this is NOT ok since all variables are of different data type.

 

The reason is that when the condition is evaluated, it will create a compare on 2 bytes, while you actually want to have a word since the end variable is a word.

 

A for next loop with an integer has an upper limit of 32766 and not 32767, the maximum value that fits into an integer.

This is done in order to save code space. Checking an overflow from 32767 to -32768 would cost extra code.

 

 

 

 

There are also other alternatives. You can use a Do.. Loop for example :

 

Dim Var As Byte

Do

'code

 Incr Var

Loop Until Var = 10

 

There are various way to get the result you need.

 

 

= See also =

[[EXIT|EXIT FOR]]

 

 

 

= Example =

 <source lang="bascomavr">
'-----------------------------------------------------------------------------------------
'name : for_next.bas
'copyright : (c) 1995-2005, MCS Electronics
'purpose : demo: FOR, NEXT
'micro : Mega48
'suited for demo : yes
'commercial addon needed : no
'-----------------------------------------------------------------------------------------

$regfile = "m48def.dat" ' specify the used micro
$crystal = 4000000 ' used crystal frequency
$baud = 19200 ' use baud rate
$hwstack = 32 ' default use 32 for the hardware stack
$swstack = 10 ' default use 10 for the SW stack
$framesize = 40 ' default use 40 for the frame space

Dim A As Byte , B1 As Byte , C As Integer

For A = 1 To 10 Step 2
Print "This is A " ; A
Next A

Print "Now lets count down"
For C = 10 To -5 Step -1
Print "This is C " ; C
Next

Print "You can also nest FOR..NEXT statements."
For A = 1 To 10
Print "This is A " ; A
For B1 = 1 To 10
Print "This is B1 " ; B1
Next ' note that you do not have to specify the parameter
Next A
End
</source> {{Languages}}

[[Category:BASCOM Language Reference/de]]

@@ Line 136: / Line 136: @@
 <span style="font-family: Arial;">&nbsp;</span>
-= <span class="f_Header">See also</span> =
+= <span class="f_Header">Siehe auch</span> =
 [[EXIT|EXIT FOR]]

@@ Line 1: / Line 1: @@
-== (**COPIED FROM ENGLISH PAGE**) === <span class="f_Header">Action</span> =
+<span class="f_Header">Funktion</span> =
-Execute a block of statements a number of times.
+Schleife mit einer festgelegten Anzahl an Wiederholungen.
 <span style="font-family: Arial;">&nbsp;</span>

@@ Line 146: / Line 146: @@
 <span style="font-family: Arial;">&nbsp;</span>
-= <span class="f_Header">Example</span> =
+= <span class="f_Header">Beispiel</span> =
 <br/><source lang="bascomavr">
@@ Line 158: / Line 158: @@
 '-----------------------------------------------------------------------------------------
-$regfile = "m48def.dat" ' specify the used micro
+$regfile = "m48def.dat" ' Benutzter Mikrocontroller
-$crystal = 4000000 ' used crystal frequency
+$crystal = 4000000 ' Benutzte Taktfrequenz
-$baud = 19200 ' use baud rate
+$baud = 19200 ' Baudrate
 $hwstack = 32 ' default use 32 for the hardware stack
 $swstack = 10 ' default use 10 for the SW stack
@@ Line 169: / Line 169: @@
 For A = 1 To 10 Step 2
-Print "This is A " ; A
+Print "Dieses ist A " ; A
 Next A
-Print "Now lets count down"
+Print "Herunterzaehlen"
 For C = 10 To -5 Step -1
-Print "This is C " ; C
+Print "Dieses ist C " ; C
 Next
-Print "You can also nest FOR..NEXT statements."
+Print "Auch Verschachtelungen von FOR..NEXT Konstrukten sind möglich."
 For A = 1 To 10
-Print "This is A " ; A
+Print "Dieses ist A " ; A
 For B1 = 1 To 10
-  Print "This is B1 " ; B1
+  Print "Dieses ist B1" ; B1
-Next ' note that you do not have to specify the parameter
+Next ' Beachte: Der Parameter nach NEXT muss nicht spezifiziert werden
 Next A
 End

@@ Line 15: / Line 15: @@
 <span style="font-family: Arial;">&nbsp;</span>
-= <span class="f_Header">Remarks</span> =
+= <span class="f_Header">Anmerkungen</span> =
 <div style="padding: 0px; margin: 0px 0px 0px 4px;">
 {| width="601" cellspacing="0" cellpadding="1" border="1" style="border: 2px solid rgb(0, 0, 0); border-spacing: 0px; border-collapse: collapse;"
@@ Line 23: / Line 23: @@
 | valign="top" width="85%" style="width: 494px; border: 1px solid rgb(0, 0, 0);" |
-The variable counter to use
+Zählervariable
 |- style="vertical-align: top;"
@@ Line 30: / Line 30: @@
 | valign="top" width="85%" style="width: 494px; border: 1px solid rgb(0, 0, 0);" |
-The starting value of the variable var
+Startwert der Zählervariablen var
 |- style="vertical-align: top;"
@@ Line 37: / Line 37: @@
 | valign="top" width="85%" style="width: 494px; border: 1px solid rgb(0, 0, 0);" |
-The ending value of the variable var
+Endwert der Zählervariablen var
 |- style="vertical-align: top;"
@@ Line 44: / Line 44: @@
 | valign="top" width="85%" style="width: 494px; border: 1px solid rgb(0, 0, 0);" |
-The value var is increased/decreased with each time NEXT is encountered.
+Wert, um den die Zählervariable var jedesmal erhöht/vermindert wird wenn NEXT erreicht wird.
 |}
@@ Line 53: / Line 53: @@
 |- valign="baseline" style="vertical-align: baseline;"
 | width="13" | <span style="font-size: 10pt; font-family: 'Arial Unicode MS', 'Lucida Sans Unicode', Arial;">•</span>
-| For incremental loops, you must use TO.
+| Für hochzählende Schleifen muss TO verwendet werden.
 |}
 </div><div style="padding: 0px; margin: 0px 0px 0px 11px;">
@@ Line 59: / Line 59: @@
 |- valign="baseline" style="vertical-align: baseline;"
 | width="13" | <span style="font-size: 10pt; font-family: 'Arial Unicode MS', 'Lucida Sans Unicode', Arial;">•</span>
-| For decremental loops, you must use a negative step size.
+| Für herunterzählende Schleifen muss eine negative Schrittweite value angegeben werden.
 |}
 </div><div style="padding: 0px; margin: 0px 0px 0px 11px;">
@@ Line 65: / Line 65: @@
 |- valign="baseline" style="vertical-align: baseline;"
 | width="13" | <span style="font-size: 10pt; font-family: 'Arial Unicode MS', 'Lucida Sans Unicode', Arial;">•</span>
-| You must end a FOR structure with the NEXT statement.
+| Ein FOR-Konstrukt muss mit NEXT abgeschlossen.
 |}
 </div><div style="padding: 0px; margin: 0px 0px 0px 11px;">
@@ Line 71: / Line 71: @@
 |- valign="baseline" style="vertical-align: baseline;"
 | width="13" | <span style="font-size: 10pt; font-family: 'Arial Unicode MS', 'Lucida Sans Unicode', Arial;">•</span>
-| The use of STEP is optional. By default, a value of 1 is used.
+| Die Benutzung von STEP ist optional. Standardmäßig wird für STEP 1 verwendet.
 |}
 </div>
 <span style="font-family: Arial;">&nbsp;</span>
-When you know in advance how many times a block of code must be executed, the FOR..NEXT loop is convenient to use.
+Wenn im Voraus bekannt ist wie oft eine Schleife ausgeführt werden soll dann ist eine FOR..NEXT Schleife geeignet.
-You can exit a FOR .. NEXT loop with the EXIT FOR statement.
+Man kann eine FOR..NEXT Schleife mit EXIT FOR (vorzeitig) verlassen.
 &nbsp;
-It is important that the if you use variables for START and END, that these are of the same data type. So for example:
+Wenn für Startwert und Endwert Variable verwendet werden dann müssen diese vom selben Datentyp sein.
 Dim x, as byte, st as byte, ed as byte
-FOR x = st TO ED ' this is ok since all variables are of the same data type
+FOR x = st TO ED ' dies ist o.k. weil alle Variablen vom selben Datentyp sind.
 &nbsp;
@@ Line 92: / Line 94: @@
 Dim x as Byte, st as Word, Ed as Long
-FOR x = st TO ED ' this is NOT ok since all variables are of different data type.
+FOR x = st TO ED ' dies ist NICHT o.k. weil die Variablen unterschiedliche Datentypen haben.
 &nbsp;
-The reason is that when the condition is evaluated, it will create a compare on 2 bytes, while you actually want to have a word since the end variable is a word.
+Der Grund ist, dass bei Auswertung der Bedingung ein 2 Byte Vergleich stattfindet während man eigentlich Long haben möchte weil die End-Variable Long ist.
 &nbsp;
-A for next loop with an integer has an upper limit of 32766 and not 32767, the maximum value that fits into an integer.
+Eine FOR-NEXT Schleife mit Integer hat einen oberen Wert von 32766  und nicht 32767 - die größte Zahl, die in eine Integer-Variable passt.
-This is done in order to save code space. Checking an overflow from 32767 to -32768 would cost extra code.
+Der Grund ist Codeoptimierung. Eine Prüfung auf 32767 bis -32768 würde mehr internen Code benötigen.
 &nbsp;
@@ Line 112: / Line 115: @@
 &nbsp;
-There are also other alternatives. You can use a Do.. Loop for example&nbsp;:
+Es gibt auch andere Möglichkeiten. Zum Beispiel kann man eine DO..LOOP Schleife benutzen&nbsp;:
 <span style="font-family: Arial;">&nbsp;</span>
@@ Line 128: / Line 131: @@
 <span style="font-family: Arial;">&nbsp;</span>
-There are various way to get the result you need.
+Es gibt viele Möglichkeiten, zum gewünschten Resultat zu kommen.
-−
 &nbsp;