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----
-title: Computations
-weight: 1
----
-This page presents all the computations that can be performed in Wyrd.
-Computations may access the current memory, but, with one exception, do not
-change it. The one exception is `(new t)`. All computations return values.
-The terms 'value' and 'computation' are interchangeable.
-
-## CONSTANT
-{{< fatecode >}}(const [BASE TYPE] {string}){{< /fatecode >}}
-Returns the `[BASE TYPE]` represented by `{string}`.
-
-## CAST
-{{< fatecode >}}(cast [COMPUTATION] [BASE TYPE]){{< /fatecode >}}
-Converts `[COMPUTATION]` to `[BASE TYPE]`, returns the result.
-
-Note:
-* Converting from `FLOAT` to `INT` returns `floor(v)`.
-* Converting from `BOOL` to `STRING` yields either `True` or `False`.
-
-The following must be supported:
-* `[FLOAT]` to `[FLOAT]`, `[INT]`, and `[STRING]`.
-* `[INT]` to `[FLOAT]`, `[INT]`, and `[STRING]`.
-* `[BOOL]` to `[BOOL]` and `[STRING]`.
-* `[STRING]` to `[BOOL]` (`true` and `false`), `[FLOAT]`, `[INT]`, and`[STRING]`.
-
-## IF-ELSE
-{{< fatecode >}}(if_else [BOOL] [C0 = COMPUTATION] [C1 = COMPUTATION]){{< /fatecode >}}
-Returns `C0` if `[BOOL]` holds _true_, `C1` otherwise. `C0` and `C1` both
-have the same type.
-
-## EQUALS
-{{< fatecode >}}(equals [C0 = COMPUTATION] [C1 = COMPUTATION]){{< /fatecode >}}
-Returns a `BOOL`, _true_ if `C0` and `C1` hold the same value. `C0` and `C1`
-are both of the same type.
-
-## MATHEMATICAL OPERATORS
-{{< fatecode >}}(divide [C0 = NUMBER] [C1 = NUMBER]){{< /fatecode >}}
-
-{{< fatecode >}}(minus [C0 = NUMBER] [C1 = NUMBER]){{< /fatecode >}}
-
-{{< fatecode >}}(plus [C0 = NUMBER] [C1 = NUMBER]){{< /fatecode >}}
-
-{{< fatecode >}}(power [C0 = NUMBER] [C1 = NUMBER]){{< /fatecode >}}
-
-{{< fatecode >}}(times [C0 = NUMBER] [C1 = NUMBER]){{< /fatecode >}}
-The operation returns a value of the same type as `C0` and `C1` (both `C0` and
-`C1` are also of the same type). Thus, `(divide C0 C1)` is an integer division
-(the remainder is discarded) if `C0` and `C1` are of type `INT`, and a standard
-division if they are of type `FLOAT`.
-
-{{< fatecode >}}(rand [C0 = INT] [C1 = INT]){{< /fatecode >}}
-Returns a random value between `C0` and `C1`, inclusive. Raises a runtime error
-if `C0 > C1`.
-
-## MATHEMATICAL COMPARISON
-{{< fatecode >}}(less_than [C0 = COMPARABLE] [C1 = COMPARABLE]){{< /fatecode >}}
-Returns a `[BOOL]` indicating if `C0` is strictly less than `C1`.
-`C0` and `C1` are both of the same type.
-
-## LOGICAL OPERATORS
-{{< fatecode >}}(and [C0 = BOOL] [C1 = BOOL]){{< /fatecode >}}
-
-{{< fatecode >}}(not [C0 = BOOL]){{< /fatecode >}}
-
-## SIZE
-{{< fatecode >}}(size [COLLECTION ADDRESS]){{< /fatecode >}}
-Returns the number of elements held by the collection at
-`[COLLECTION ADDRESS]`.
-
-## REFERENCES
-{{< fatecode >}}(address [COMPUTATION]){{< /fatecode >}}
-Returns an `ADDRESS` to the memory element at address `[COMPUTATION]`. Raises a
-runtime error if `[COMPUTATION]` is not a memory element.
-
-{{< fatecode >}}(relative_address [R0 = (COLLECTION|STRUCTURE) ADDRESS] [STRING]){{< /fatecode >}}
-Returns a `REFERENCE` to member `[STRING]` of `R0`.
-
-{{< fatecode >}}(value_of [ADDRESS]){{< /fatecode >}}
-Returns the value held at the memory location `[ADDRESS]`.
-
-{{< fatecode >}}(new [TYPE]){{< /fatecode >}}
-Returns an `[TYPE] ADDRESS` to a newly allocated memory element of
-type `[TYPE]`.
-
-## TEXT
-{{< fatecode >}}(newline){{< /fatecode >}}
-Returns a `TEXT` value corresponding to a newline.
-
-{{< fatecode >}}(text [S0 = STRING] ... [SN = STRING]){{< /fatecode >}}
-Returns a single value `[TEXT]` representing the elements `S0` ... `S1`.
-
-{{< fatecode >}}(add_text_effect ({string} [V0 = COMPUTATION] ... [VN = COMPUTATION]) [TEXT]){{< /fatecode >}}
-Returns a `[TEXT]` value of `[TEXT]` with the given effect enabled.
-
-## LAST USER CHOICE
-{{< fatecode >}}(get_last_user_choice){{< /fatecode >}}
-Returns the number corresponding to the option last chosen by the user in a
-`(resolve_choices)`, or `-1` if there is no such value.