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83Plus:Basic:While

2005-12-05T16:55:21Z

70.150.174.3: /* Comments */

[[Category:83Plus:Basic:Conditionals|While]]
== Synopsis ==
'''Token Size:''' 1 byte

'''Syntax:'''
:While ''condition''
:''command''
:End

The while command is used to execute a command or series of commands when a variable shares a given relationship with another variable or a value. A ''While'' command will continue to execute everything before the next ''End'' until the given condition is no longer met.

== Comments ==
Use of a Goto statement within an While statement will cause an increase in memory allocation, leading to program slowdowns and eventually a MEMORY error. For example, the following code will eventually cause an error:

<nowiki>
Lbl 0
While X=1
X+1->X
Disp X
Goto 0
End</nowiki>

If you must use a Goto within an While statement, it is possible to trick the 83+ into thinking the block ended by jumping to an otherwise unused label that uses an End statement followed by a jump to the proper label. For example, the above program could be rewritten like so:

<nowiki>0->X
Lbl 0
While X=1
X+1->X
Disp X
Goto 2
End
Return

Lbl 2
End
Goto 0</nowiki>

This would avoid the problem by causing the 83+ to terminate the While conditional prior to jumping.

== Examples ==
<nowiki>
:While X =/= 105
:Getkey -> G
:End
</nowiki>
Or, if you desire the use of other operators, such as And, Or, or Xor:
<nowiki>
:While X=5 and Y=/=3
:Input "",A
:A+X->Y
:End
</nowiki>

83Plus:Basic:While

2005-12-05T16:53:43Z

70.150.174.3:

[[Category:83Plus:Basic:Conditionals|While]]
== Synopsis ==
'''Token Size:''' 1 byte

'''Syntax:'''
:While ''condition''
:''command''
:End

The while command is used to execute a command or series of commands when a variable shares a given relationship with another variable or a value. A ''While'' command will continue to execute everything before the next ''End'' until the given condition is no longer met.

== Comments ==
Use of a Goto statement within an While statement will cause an increase in memory allocation, leading to program slowdowns and eventually a MEMORY error. For example, the following code will eventually cause an error:

<nowiki>0->X ;-> == STO operator
Lbl 0
While X=1
X+1->X
Disp X
Goto 0
End</nowiki>

If you must use a Goto within an While statement, it is possible to trick the 83+ into thinking the block ended by jumping to an otherwise unused label that uses an End statement followed by a jump to the proper label. For example, the above program could be rewritten like so:

<nowiki>0->X
Lbl 0
While X=1
X+1->X
Disp X
Goto 2
End
Return

Lbl 2
End
Goto 0</nowiki>

This would avoid the problem by causing the 83+ to terminate the While conditional prior to jumping.

== Examples ==
<nowiki>
:While X =/= 105
:Getkey -> G
:End
</nowiki>
Or, if you desire the use of other operators, such as And, Or, or Xor:
<nowiki>
:While X=5 and Y=/=3
:Input "",A
:A+X->Y
:End
</nowiki>