Hello World

hello.zig

const std = @import("std");
pub fn main() !void {
    const stdout = std.io.getStdOut().outStream();
    try stdout.print("Hello, {}!\n", .{"world"});
}

$ zig build-exe hello.zig
$ ./hello
Hello, world!

Usually you don't want to write to stdout. You want to write to stderr. And you don't care if it fails. It's more like a warning message that you want to emit. For that you can use a simpler API:

hello.zig

const warn = @import("std").debug.warn;
pub fn main() void {
    warn("Hello, world!\n", .{});
}

$ zig build-exe hello.zig
$ ./hello
Hello, world!

Note that you can leave off the ! from the return type because warn cannot fail.

See also:

• Values
• @import
• Errors
• Root Source File