ref: 0f3db39e37962190a1ab913039c344ae40bd1713
parent: eb83423d255d652e4f8fa4ad5e1b1fc1c722f54c
author: henesy <henesy.dev@gmail.com>
date: Mon Feb 25 11:59:36 EST 2019
add values example
--- /dev/null
+++ b/Values/README.md
@@ -1,0 +1,77 @@
+# Values
+
+Limbo has a variety of primitive types available and possesses the ability to coerce between them.
+
+## Source
+
+### values.b:6,7
+
+ sys: Sys;
+ print, sprint: import sys;
+
+The `import` statement allows you to define a local name which is tied to a name in another space. That is, the `print` name becomes equivalent to `sys->print`.
+
+### values.b:16,19
+
+ n := 7;
+ b := big 8;
+ f := real 3.2;
+ str := "String!";
+
+Three variables are defined, `n` is an integer, `b` is a long integer, `f` is a floating point number, `str` is a string.
+
+Rather than the word float, the word `real` is used to identify a floating point number.
+
+Note: At present, Inferno only supports 32-bit architectures, so all types are 32-bit types.
+
+### values.b:21,22
+
+ print("%d\n", 0 || 1);+ print("%d\n", 0 && 1);+
+There are no boolean types in Limbo. As per C, 0 indicates false and values ≥ 1 indicate true.
+
+### values.b:24,26
+
+ print("%d\n", n / int f);+ print("%f\n", real n / f);+ print("%bd\n", b / big 8);+
+Types and type conflicts are checked at compile-time. Prefacing a variable or value with a type name coerces the variable or value to an equivalent value of the provided type.
+
+There are no implicit conversions of types, all type coercion must be explicitly stated.
+
+### values.b:28,29
+
+ print("%s\n", str[:len str-1]);+ print("%s\n", str[2:]);+
+Array types can be sliced. The `:` operator acts on a range between either a value or to one end of the array if no value is provided on a side of the `:`.
+
+The `len` statement provides the number of elements in a string, array, or list.
+
+### values.b:31,32
+
+ print("%s", "inferno " + "os " + sprint("%c", '\n'));+ print("limbo" + " " + "lang\n");+
+Strings can be concatenated via `+` and `+=` (not shown).
+
+## Demo
+
+ ; limbo values.b
+ ; values
+ 1
+ 0
+ 2
+ 2.187500
+ String
+ ring!
+ inferno os
+ limbo lang
+ ;
+
+## Exercises
+
+- On values.b:31 remove the `"%s",`, what happens?
+- Try removing type coercions and change format specifiers, see what happens!
--- /dev/null
+++ b/Values/values.b
@@ -1,0 +1,35 @@
+implement Values;
+
+include "sys.m";
+include "draw.m";
+
+sys: Sys;
+print, sprint: import sys;
+
+Values: module {+ init: fn(nil: ref Draw->Context, nil: list of string);
+};
+
+init(nil: ref Draw->Context, nil: list of string) {+ sys = load Sys Sys->PATH;
+
+ n := 7;
+ b := big 8;
+ f := real 3.2;
+ str := "String!";
+
+ print("%d\n", 0 || 1);+ print("%d\n", 0 && 1);+
+ print("%d\n", n / int f);+ print("%f\n", real n / f);+ print("%bd\n", b / big 8);+
+ print("%s\n", str[:len str-1]);+ print("%s\n", str[2:]);+
+ print("%s", "inferno " + "os " + sprint("%c", '\n'));+ print("limbo" + " " + "lang\n");+
+ exit;
+}