first try zig - number 5 game

main.zig

const std = @import("std");
const time = std.time;
const prng = std.rand.DefaultPrng;

pub fn main() anyerror!void {
    const stdin = std.io.getStdIn().reader();
    const stdout = std.io.getStdOut().writer();

    try stdout.print("Welcome, {s}!\n", .{"5 of Number Game!"});

    var buf: [6]u8 = undefined;
    var intall: i64 = undefined;
    var int: [5]i64 = undefined;
    var rand: [5]i64 = undefined;

    var randall = @intCast(i64, @rem(prng.init(@intCast(u64, time.milliTimestamp())).random().int(u64), 100000));
    // try stdout.print("Answer Number is {d}\n", .{randall});
    rand[0] = try std.math.divFloor(i64, randall, 10000);
    rand[1] = try std.math.divFloor(i64, @rem(randall, 10000), 1000);
    rand[2] = try std.math.divFloor(i64, @rem(randall, 1000), 100);
    rand[3] = try std.math.divFloor(i64, @rem(randall, 100), 10);
    rand[4] = try std.math.divFloor(i64, @rem(randall, 10), 1);

    while(true) {
        if (try stdin.readUntilDelimiterOrEof(buf[0..], '\n')) |user_input| {
            try stdout.print("Input Number is {s}\n", .{user_input});
            intall = try std.fmt.parseInt(i64, user_input, 10);
            int[0] = try std.math.divFloor(i64, intall, 10000);
            int[1] = try std.math.divFloor(i64, @rem(intall, 10000), 1000);
            int[2] = try std.math.divFloor(i64, @rem(intall, 1000), 100);
            int[3] = try std.math.divFloor(i64, @rem(intall, 100), 10);
            int[4] = try std.math.divFloor(i64, @rem(intall, 10), 1);

            for (int) |val, index| {
                try stdout.print("{d}st Input Number is {d} -> {b}\n", .{index+1, val, val == rand[index]});
            }
        }

        if (int[0] == rand[0] and int[1] == rand[1] and int[2] == rand[2] and int[3] == rand[3] and int[4] == rand[4]) {
            try stdout.print("Great! Answer Number is {d}! You Won!\n", .{randall});
            break;
        }
    }
}