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[red/en] changing the formatting of comments so that lines are always less than 80 characters.
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@ -23,17 +23,17 @@ from any platform to any other platform. And it will do this all from a binary e
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Ready to learn your first Red?
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Ready to learn your first Red?
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```
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```
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All text before the header will be treated as comment, as long as you avoid using the
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All text before the header will be treated as comment, as long as you avoid
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word "red" starting with a capital "R" in this pre-header text. This is a temporary
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using the word "red" starting with a capital "R" in this pre-header text.
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shortcoming of the used lexer but most of the time you start your script or program
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This is a temporary shortcoming of the used lexer but most of the time you
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with the header itself.
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start your script or program with the header itself.
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The header of a red script is the capitalized word "red" followed by a
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The header of a red script is the capitalized word "red" followed by a
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whitespace character followed by a block of square brackets [].
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whitespace character followed by a block of square brackets []. The block of
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The block of brackets can be filled with useful information about this script or
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brackets can be filled with useful information about this script or program:
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program: the author's name, the filename, the version, the license, a summary of
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the author's name, the filename, the version, the license, a summary of what
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what the program does or any other files it needs.
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the program does or any other files it needs. The red/System header is just
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The red/System header is just like the red header, only saying "red/System" and
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like the red header, only saying "red/System" and not "red".
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not "red".
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Red []
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Red []
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@ -50,9 +50,9 @@ comment {
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; no need to restrict this to a 'main' function.
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; no need to restrict this to a 'main' function.
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; Valid variable names start with a letter and can contain numbers,
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; Valid variable names start with a letter and can contain numbers,
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; variables containing only capital A thru F and numbers and ending with 'h' are
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; variables containing only capital A thru F and numbers and ending with 'h'
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; forbidden, because that is how hexadecimal numbers are expressed in Red and
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; are forbidden, because that is how hexadecimal numbers are expressed in Red
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; Red/System.
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; and Red/System.
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; assign a value to a variable using a colon ":"
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; assign a value to a variable using a colon ":"
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my-name: "Red"
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my-name: "Red"
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@ -63,8 +63,8 @@ reason-for-using-the-colon: {Assigning values using the colon makes
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}
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}
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is-this-name-valid?: true
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is-this-name-valid?: true
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; print output using print, or prin for printing without a newline or linefeed at the
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; print output using print, or prin for printing without a newline or linefeed
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; end of the printed text.
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; at the end of the printed text.
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prin " My name is " print my-name
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prin " My name is " print my-name
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My name is Red
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My name is Red
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@ -72,7 +72,7 @@ My name is Red
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print ["My name is " my-name lf]
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print ["My name is " my-name lf]
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My name is Red
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My name is Red
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; In case you haven't already noticed: statements do NOT end with a semicolon ;-)
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; If you haven't already noticed: statements do NOT end with a semicolon ;-)
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;
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;
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; Datatypes
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; Datatypes
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@ -85,13 +85,13 @@ My name is Red
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; Some of the available types are integer! string! block!
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; Some of the available types are integer! string! block!
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; Declaring variables before using them?
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; Declaring variables before using them?
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; Red knows by itself what variable is best to use for the data you want to use it
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; Red knows by itself what variable is best to use for the data you want to
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; for.
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; use it for.
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; A variable declaration is not always necessary.
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; A variable declaration is not always necessary.
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; It is considered good coding practise to declare your variables,
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; It is considered good coding practise to declare your variables,
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; but it is not forced upon you by Red.
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; but it is not forced upon you by Red.
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; You can declare a variable and specify its type. a variable's type determines its
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; You can declare a variable and specify its type. a variable's type
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; size in bytes.
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; determines its size in bytes.
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; Variables of integer! type are usually 4 bytes or 32 bits
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; Variables of integer! type are usually 4 bytes or 32 bits
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my-integer: 0
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my-integer: 0
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@ -111,10 +111,10 @@ i2 - i1 ; result 1
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i2 * i1 ; result 2
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i2 * i1 ; result 2
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i1 / i2 ; result 0 (0.5, but truncated towards 0)
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i1 / i2 ; result 0 (0.5, but truncated towards 0)
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; Comparison operators are probably familiar, and unlike in other languages you
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; Comparison operators are probably familiar, and unlike in other languages
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; only need a single '=' sign for comparison.
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; you only need a single '=' sign for comparison.
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; There is a boolean like type in Red. It has values true and false, but also the
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; There is a boolean like type in Red. It has values true and false, but also
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; values on/off or yes/no can be used
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; the values on/off or yes/no can be used
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3 = 2 ; result false
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3 = 2 ; result false
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3 != 2 ; result true
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3 != 2 ; result true
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@ -127,14 +127,14 @@ i1 / i2 ; result 0 (0.5, but truncated towards 0)
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; Control Structures
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; Control Structures
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;
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;
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; if
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; if
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; Evaluate a block of code if a given condition is true. IF does not return any value,
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; Evaluate a block of code if a given condition is true. IF does not return
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; so cannot be used in an expression.
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; any value, so cannot be used in an expression.
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if a < 0 [print "a is negative"]
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if a < 0 [print "a is negative"]
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; either
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; either
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; Evaluate a block of code if a given condition is true, else evaluate an alternative
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; Evaluate a block of code if a given condition is true, else evaluate an
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; block of code. If the last expressions in both blocks have the same type, EITHER can
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; alternative block of code. If the last expressions in both blocks have the
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; be used inside an expression.
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; same type, EITHER can be used inside an expression.
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either a < 0 [
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either a < 0 [
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either a = 0 [
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either a = 0 [
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msg: "zero"
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msg: "zero"
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@ -172,8 +172,8 @@ until [
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]
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]
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; will output:
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; will output:
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ooooo
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ooooo
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; Note that the loop will always be evaluated at least once, even if the condition is
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; Note that the loop will always be evaluated at least once, even if the
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; not met from the beginning.
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; condition is not met from the beginning.
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; while
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; while
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; While a given condition is met, evaluate a block of code.
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; While a given condition is met, evaluate a block of code.
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