strings weird

.gitignore

@@ -1 +1,3 @@
 zig-cache
+*.exe
+*.pdb

global_variables.zig

@@ -0,0 +1,14 @@
+var y: i32 = add(10, x);
+const x: i32 = add(12, 34);
+
+test "global variables" {
+    assert(x == 46);
+    assert(y == 56);
+}
+
+fn add(a: i32, b: i32) i32 {
+    return a + b;
+}
+
+const std = @import("std");
+const assert = std.debug.assert;

hello.zig

@@ -1,6 +1,6 @@
 const std = @import("std");
 
-pub fn main() void {
-    std.debug.print("Hello, {}!\n", .{"World"});
+pub fn main() !void {
+    const stdout = std.io.getStdOut().writer();
+    try stdout.print("Hello, {}!\n", .{"World"});
 }
-

iterator.zig

@@ -0,0 +1,9 @@
+const std = @import("std");
+
+pub fn main() void {
+    const msg = "hello this is dog";
+    var words = std.mem.tokenize(msg, " ");
+    while (words.next()) |word| {
+        std.debug.print("{}\n", .{word});
+    }
+}

optional.zig

@@ -0,0 +1,12 @@
+const std = @import("std");
+const assert = std.debug.assert;
+
+test "null @intToPtr" {
+    // the ? means that the pointer can be null. If you remove it, the test
+    // fails because you're trying to set a null pointer.
+    //
+    // the 0 can also be written 0x0 but I don't know if there's any practical
+    // difference.
+    const ptr = @intToPtr(?*i32, 0);
+    assert(ptr == null);
+}

point.zig

@@ -0,0 +1,8 @@
+const Point = struct {
+    x: i32,
+    y: i32,
+
+    pub fn mag() f32 {
+        return 0;
+    }
+};

string_literals.zig

@@ -0,0 +1,14 @@
+const expect = @import("std").testing.expect;
+const mem = @import("std").mem;
+
+test "string literals" {
+    const bytes = "hello";
+    expect(@TypeOf(bytes) == *const [5:0]u8);
+    expect(bytes.len == 5);
+    expect(bytes[1] == 'e');
+    expect(bytes[5] == 0);
+    expect('e' == '\x65');
+    expect('\u{1f4a9}' == 128169);
+    expect('💯' == 128175);
+    expect(mem.eql(u8, "hello", "h\x65llo"));
+}

values.zig

@@ -0,0 +1,43 @@
+const std = @import("std");
+const print = std.debug.print;
+const os = std.os;
+const assert = std.debug.assert;
+
+pub fn main() void {
+    // integers
+    const one_plus_one: i32 = 1 + 1;
+    print("1 + 1 = {}\n", .{one_plus_one});
+
+    // floats
+    const seven_div_three: f32 = 7.0 / 3.0;
+    print("7.0 / 3.0 = {}\n", .{seven_div_three});
+
+    // booleans
+    print("{}\n{}\n{}\n", .{
+        true and false,
+        true or false,
+        !true,
+    });
+
+    // optional hmm
+    var optional_value: ?[]const u8 = null;
+    assert(optional_value == null);
+
+    print("\noptional 1\ntype: {}\nvalue: {}\n", .{
+        @typeName(@TypeOf(optional_value)),
+        optional_value,
+    });
+
+    // error union
+    var number_or_error: anyerror!i32 = error.ArgNotFound;
+    print("\nerror union 1\ntype: {}\nvalue: {}\n", .{
+        @typeName(@TypeOf(number_or_error)),
+        number_or_error,
+    });
+
+    number_or_error = 1234;
+    print("\nerror union2\ntype: {}\nvalue: {}\n", .{
+        @typeName(@TypeOf(number_or_error)),
+        number_or_error,
+    });
+}