1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
|
//
// 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)
//
// const foo: u8 = 20;
// var bar: u16 = 2000;
//
// 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});
}
|
