PICAXE

Name:
next
Syntax:

FOR variable = start TO end
  {code}
NEXT {variable}

FOR variable = start TO end STEP {-}increment
  {code}
NEXT {variable}

FOR variable = start DOWNTO end
  {code}
NEXT {variable}

FOR variable = start DOWNTO end STEP decrement
  {code}
NEXT {variable}

Variable - will be used as the loop counter

Start - is the initial value of variable

End - is the finish value of variable

Increment - is an optional value which overrides the default counter value of +1. If Increment is preceded by a '-', it will be assumed that Start is greater than End, and therefore increment will be subtracted (rather than added) on each loop.

Description:

The 'next' command indicates the end of the 'for...next' loop and tests the control variable's value to see if the code within the 'for...next' loop should be repeated or whether execution should continue after the 'next' command.

The control variable name may optionally be placed after the 'next' command and if used must match the control variable named in the 'for' command.

A 'for...next' command will always be executed at least once, regardless of start and end values. Whether to repeat the code within the 'for...next' loop is determined upon execution of the 'next' command, not upon execution of the 'for' command as may be the case in some other programming languages.

The 'for...next' start and end values are evaluated every time the 'next command is executed so if the start or end values are specified by variables, altering those variables within the 'for...next' loop can affect how many times the loop will execute. This may cause the 'for...next' to repeat indefinitely or more times than expected.

 

Applies To:
All
See Also:
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    Flash an LED

    Flash an LED once, twice, then up to twenty times before repeating again. The cycle can be restarted from a single flash by setting the input C.1 high

    Code Example:
    	for b0 = 1 to 20		; define loop for 20 times
	  if pinC.1 = 1 then exit
	  high B.1			; switch on output B.1
	  pause 500			; wait 0.5 seconds
	  low B.1			; switch off output B.1
	  pause 500			; wait 0.5 seconds
	next b0				; end of loop
	pause 2000			; wait for 2 seconds
	goto main			; loop back to start
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