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Update red.html.markdown

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Updated document on two things the author of Red pointed out.
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iArnold 2014-01-31 20:44:43 +01:00
parent 453341b527
commit 57b0ac6412
1 changed files with 7 additions and 6 deletions
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@ -24,8 +24,9 @@ Ready to learn your first Red?
```Red
All text before the header will be treated as comment, as long as you avoid using the word "red"
starting with a capital "R" in this pre-header text. Most of the time you start your script or program with
the header itself. The header of a red script is the capitalized word "red" followed by a
starting with a capital "R" in this pre-header text. This is a temporary shortcoming of the used lexer but
most of the time you start your script or program with the header itself.
The header of a red script is the capitalized word "red" followed by a
whitespace character followed by a block of square brackets [].
The block of brackets can be filled with useful information about the script or program: the author,
the filename, the version, the license, what the program does or needs.
@ -122,12 +123,12 @@ i1 / i2 ; result 0 (0.5, but truncated towards 0)
; Control Structures
;
; if
; Execute a block of code if a given condition is true. IF does not return any value,
; Evaluate a block of code if a given condition is true. IF does not return any value,
; so cannot be used in an expression.
if a < 0 [print "a is negative"]
; either
; Execute a block of code if a given condition is true, else execute an alternative block of code.
; Evaluate a block of code if a given condition is true, else evaluate an alternative block of code.
; If last expressions in both blocks have the same type, EITHER can be used inside an expression.
either a < 0 [
either a = 0 [
@ -165,10 +166,10 @@ until [
]
; will output:
ooooo
; Note that the loop will always be executed at least once, even if the condition is not met from the beginning.
; Note that the loop will always be evaluated at least once, even if the condition is not met from the beginning.
; while
; While a given condition is met, execute a block of code. WHILE does not return any value,
; While a given condition is met, evaluate a block of code. WHILE does not return any value,
; so cannot be used in an expression.
c: 5
while [c > 0][