1const builtin = @import("builtin");
 2const std = @import("std");
 3
 4pub fn main() !void {
 5    var stdout_writer = std.fs.File.stdout().writerStreaming(&.{});
 6    const out = &stdout_writer.interface;
 7    const stdin: std.fs.File = .stdin();
 8
 9    try out.writeAll("Welcome to the Guess Number Game in Zig.\n");
10
11    const answer = std.crypto.random.intRangeLessThan(u8, 0, 100) + 1;
12
13    while (true) {
14        try out.writeAll("\nGuess a number between 1 and 100: ");
15        var line_buf: [20]u8 = undefined;
16        const amt = try stdin.read(&line_buf);
17        if (amt == line_buf.len) {
18            try out.writeAll("Input too long.\n");
19            continue;
20        }
21        const line = std.mem.trimEnd(u8, line_buf[0..amt], "\r\n");
22
23        const guess = std.fmt.parseUnsigned(u8, line, 10) catch {
24            try out.writeAll("Invalid number.\n");
25            continue;
26        };
27        if (guess > answer) {
28            try out.writeAll("Guess lower.\n");
29        } else if (guess < answer) {
30            try out.writeAll("Guess higher.\n");
31        } else {
32            try out.writeAll("You win!\n");
33            return;
34        }
35    }
36}