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authorDave Gauer <dave@ratfactor.com>2021-02-09 18:36:57 -0500
committerDave Gauer <dave@ratfactor.com>2021-02-09 18:36:57 -0500
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+//
+// It seems we got a little carried away making everything "const u8"!
+//
+// "const" values cannot change.
+// "u" types are "unsigned" and cannot store negative values.
+// "8" means the type is 8 bits in size.
+//
+// Example: foo cannot change (it is CONSTant)
+// bar can change (it is VARiable):
+//
+// const foo: u8 = 20;
+// var bar: u8 = 20;
+//
+// Example: foo cannot be negative and can hold 0 to 255
+// bar CAN be negative and can hold −128 to 127
+//
+// const foo: u8 = 20;
+// var bar: i8 = -20;
+//
+// Example: foo can hold 8 bits (0 to 255)
+// bar can hold 16 bits (0 to 65,535)
+//
+// You can do just about any combination of these that you can think of:
+//
+// u32 can hold 0 to 4,294,967,295
+// i64 can hold −9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
+//
+// Please fix this program so that the types can hold the desired values
+// and the errors go away!
+//
+const std = @import("std");
+
+pub fn main() void {
+ const n: u8 = 50;
+ n = n + 5;
+
+ const pi: u8 = 314159;
+
+ const negative_eleven: u8 = -11;
+
+ // There are no errors in the next line, just explanation:
+ // Perhaps you noticed before that the print function takes two
+ // parameters. Now it will make more sense: the first parameter
+ // is a string. The string may contain placeholders '{}', and the
+ // second parameter is an "anonymous list literal" (don't worry
+ // about this for now!) with the values to be printed.
+ std.debug.print("{} {} {}\n", .{n, pi, negative_eleven});
+}