127 lines
4.7 KiB
Factor
127 lines
4.7 KiB
Factor
USING: help.markup help.syntax math math.parser.private prettyprint
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namespaces make strings ;
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IN: math.parser
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ARTICLE: "number-strings" "Converting between numbers and strings"
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"These words only convert between real numbers and strings. Complex numbers are constructed by the parser (" { $link "parser" } ") and printed by the prettyprinter (" { $link "prettyprint" } ")."
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$nl
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"Integers can be converted to and from arbitrary bases. Floating point numbers can only be converted to and from base 10 and 16."
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$nl
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"Converting numbers to strings:"
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{ $subsections
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number>string
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>bin
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>oct
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>hex
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>base
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}
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"Converting strings to numbers:"
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{ $subsections
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string>number
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bin>
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oct>
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hex>
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base>
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}
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"You can also input literal numbers in a different base (" { $link "syntax-integers" } ")."
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{ $see-also "prettyprint-numbers" } ;
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ABOUT: "number-strings"
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HELP: digits>integer
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{ $values { "seq" "a sequence of integers" } { "radix" "an integer between 2 and 16" } { "n/f" { $maybe integer } } }
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{ $description "Converts a sequence of digits (with most significant digit first) into an integer." }
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{ $notes "This is one of the factors of " { $link string>number } "." } ;
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HELP: >digit
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{ $values { "n" "an integer between 0 and 15" } { "ch" "a character" } }
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{ $description "Outputs a character representation of a digit." }
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{ $notes "This is one of the factors of " { $link number>string } "." } ;
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HELP: digit>
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{ $values { "ch" "a character" } { "n" integer } }
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{ $description "Converts a character representation of a digit to an integer." }
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{ $notes "This is one of the factors of " { $link string>number } "." } ;
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HELP: base>
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{ $values { "str" string } { "radix" "an integer between 2 and 16" } { "n/f" "a real number or " { $link f } } }
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{ $description "Creates a real number from a string representation with the given radix. The radix is ignored for floating point literals; they are always taken to be in base 10."
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$nl
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"Outputs " { $link f } " if the string does not represent a number." } ;
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{ >base base> } related-words
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HELP: string>number
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{ $values { "str" string } { "n/f" "a real number or " { $link f } } }
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{ $description "Creates a real number from a string representation of a number in base 10."
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$nl
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"Outputs " { $link f } " if the string does not represent a number." } ;
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{ string>number number>string } related-words
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HELP: bin>
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{ $values { "str" string } { "n/f" "a real number or " { $link f } } }
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{ $description "Creates a real number from a string representation of a number in base 2."
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$nl
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"Outputs " { $link f } " if the string does not represent a number." } ;
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{ >bin POSTPONE: BIN: bin> .b } related-words
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HELP: oct>
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{ $values { "str" string } { "n/f" "a real number or " { $link f } } }
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{ $description "Creates a real number from a string representation of a number in base 8."
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$nl
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"Outputs " { $link f } " if the string does not represent a number." } ;
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{ >oct POSTPONE: OCT: oct> .o } related-words
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HELP: hex>
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{ $values { "str" string } { "n/f" "a real number or " { $link f } } }
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{ $description "Creates a real number from a string representation of a number in base 16."
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$nl
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"Outputs " { $link f } " if the string does not represent a number." } ;
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{ >hex POSTPONE: HEX: hex> .h } related-words
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HELP: >base
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{ $values { "n" real } { "radix" "an integer between 2 and 16" } { "str" string } }
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{ $description "Converts a real number into a string representation using the given radix. If the number is a float, the radix is ignored and the output is always in base 10." } ;
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HELP: >bin
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{ $values { "n" real } { "str" string } }
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{ $description "Outputs a string representation of a number using base 2." } ;
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HELP: >oct
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{ $values { "n" real } { "str" string } }
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{ $description "Outputs a string representation of a number using base 8." } ;
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HELP: >hex
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{ $values { "n" real } { "str" string } }
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{ $description "Outputs a string representation of a number using base 16." }
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{ $examples
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{ $example
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"USING: math.parser prettyprint ;"
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"3735928559 >hex ."
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"\"deadbeef\""
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}
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{ $example
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"USING: math.parser prettyprint ;"
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"-15.5 >hex ."
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"\"-1.fp3\""
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}
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} ;
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HELP: float>string
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{ $values { "n" real } { "str" string } }
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{ $description "Primitive for getting a string representation of a float." }
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{ $notes "The " { $link number>string } " word is more general." } ;
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HELP: number>string
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{ $values { "n" real } { "str" string } }
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{ $description "Converts a real number to a string." }
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{ $notes "Printing complex numbers requires the more general prettyprinter facility (see " { $link "prettyprint" } ")." } ;
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HELP: #
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{ $values { "n" real } }
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{ $description "Appends the string representation of a real number to the end of the sequence being constructed by " { $link make } "." } ;
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