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fix doc about for loops

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Irmen de Jong 2019-08-18 14:14:14 +02:00
parent f0d4654917
commit 50d792a121
1 changed files with 12 additions and 7 deletions
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19
docs/source/syntaxreference.rst
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@ -517,8 +517,8 @@ Loops
for loop
^^^^^^^^
The loop variable must be a register or a byte/word variable. It must be defined first in the local scope (to reuse
an existing variable).
The loop variable must be a register or a byte/word variable,
and must be defined first in the local scope of the for loop.
The expression that you loop over can be anything that supports iteration (such as ranges like ``0 to 100``,
array variables and strings) *except* floating-point arrays (because a floating-point loop variable is not supported).
@ -530,18 +530,23 @@ You can use a single statement, or a statement block like in the example below::
continue ; immediately enter next iteration
}
For example, this is a for loop using the existing byte variable ``i`` to loop over a certain range of numbers::
For example, this is a for loop using a byte variable ``i``, defined before, to loop over a certain range of numbers::
ubyte i
...
for i in 20 to 155 {
; do something
}
And this is a loop over the values of the array ``fibonacci_numbers`` where the loop variable is declared in the loop itself::
And this is a loop over the values of the array ``fibonacci_numbers``::
word[] fibonacci_numbers = [0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597, 2584, 4181]
uword[] fibonacci_numbers = [0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597, 2584, 4181]
for word fibnr in fibonacci_numbers {
; do something
uword number
for number in fibonacci_numbers {
; do something with number
}