Java Implementation of 99 Multiplication Table — Using For Loop and Recursion
This article presents two Java implementations of the 99 multiplication table: a nested for loop and a recursive method. It compares both programming approaches, showing how to print the classic multiplication grid efficiently. Readers gain practical coding examples for loops and recursion in Java.
Python Formatted Output (% and format Usage)
This article explains Python's formatted output methods, covering %-formatting for integers, floats, and strings, common format specifiers, and auxiliary width/precision controls. It details format() templates with positional, indexed, and keyword placeholders. Key caveats include round()'s .5 nearest-even behavior and floating-point inaccuracies such as round(2.675, 2) yielding 2.67. Readers gain practical knowledge for controlling string alignment, decimal precision, scientific notation, and multi-variable output accurately.
ViewSonic VG2481-4K Monitor: A Brief Unboxing and Review of the 24-inch 4K HDR400 Wide-Gamut Display
This review covers the ViewSonic VG2481-4K, a 23.8-inch 4K UHD IPS monitor with HDR400, 10-bit color (8-bit+FRC), and USB-C with 96W Power Delivery. Measured brightness reaches 403 cd/m² max, average Delta E is 0.28, and color gamut coverage is excellent. It includes a factory calibration report, USB 3.0 hub, adjustable stand, and built-in speakers. The USB-C port successfully powered a 60W fill light. Power consumption is about 31W, with modest heat generation. Ideal for users needing sharp 4K display and single-cable laptop charging.
Alibaba Cloud Thailand Lightweight Server: 2C1G, 200Mbps Unlimited Traffic for Only 34 CNY/Month
Alibaba Cloud’s Bangkok lightweight server offers 2 cores, 1GB RAM, 30GB storage, 200Mbps unlimited traffic for 34 yuan/month; a 2C4G version costs 112 yuan. Tests show adequate CPU performance and ~232Mbps speeds, but Telecom/Unicom routes detour heavily. Only China Mobile has direct connections. IP quality is clean, but mail ports are limited. Not recommended for non-Mobile users.
Laika Cloud Korea VPS Performance Review: Dual ISP Residential IPs, 1C1G 100Mbps, Only 54 CNY/Month
Laika Cloud's Korea VPS provides dual ISP residential IPs with no ICP registration required, priced from 54 CNY/month for 1 core, 1 GB RAM, and 100 Mbps bandwidth, or 114 CNY/month for 2 cores, 4 GB RAM, and 200 Mbps. Network routing uses direct CN2-GIA, CUG, and CMI paths for both inbound and outbound traffic to China, achieving an average 61 ms latency across major Chinese ISPs. Benchmark tests demonstrate solid single-core performance (Geekbench 6: 615) and near-full bandwidth utilization (98 Mbps download). IP quality checks confirm ISP classification, clean reputation scores, and full mail port availability for SMTP, POP3, and IMAP.
What is dB? How to Calculate dBm, dBc, dBi, and dBd, and What Are Their Differences?
This article explains dB as a logarithmic unit for ratios, using 10log for power and 20log for voltage/current. It defines dBm against 1 mW, dBc against carrier power, dBi against isotropic antenna, and dBd against dipole (dBi minus 2.15). Understanding these units and calculations enables accurate analysis and design of electronic and communication systems.
![[Study Notes] Trigonometric Functions (Sine, Cosine, Tangent)](https://tc2.zeruns.tech/2024/07/15/image4da1a5242de10fdc.png)
[Study Notes] Trigonometric Functions (Sine, Cosine, Tangent)
The article details sine, cosine, and tangent functions, defining them via unit circle and right-triangle ratios. It covers key properties including periodicity, parity, range, and special values, plus essential identities such as Pythagorean, phase-shift, sum/difference, and double-angle formulas. Applications span physics, engineering, astronomy, and biology, emphasizing the functions’ role in modeling periodic phenomena.
7 Days To Die Server Setup Guide. How to Set Up Your Own 7 Days To Die Dedicated Server
This guide explains how to set up a 7 Days to Die multiplayer server from scratch. It covers purchasing a Rainyun cloud server, connecting via Remote Desktop, configuring NAT port forwarding, expanding disk space, installing the server via SteamCMD, editing server configuration files, and joining the game by IP and port. Readers learn to host a playable server with friends using the provided beginner-friendly steps.
Review and Teardown: Mechrevo imini Pro 820 Mini PC with 8845H, Just 2,300 RMB After Subsidy
The Mechrevo imini Pro 820 is a budget-friendly mini PC priced at about 2,300 RMB after a 20% government subsidy. It features an AMD Ryzen 7 8845H, 24GB DDR5 RAM, 1TB SSD, dual 2.5G LAN, and USB4. Its aluminum-alloy design is compact and portable. Benchmarks show strong CPU performance, surpassing an i9-11900K in multi-core tests. It suits office work and server use, with idle power consumption around 19W.
How to Install Minecraft Bedrock Dedicated Server (BDS). Setting up a MC Bedrock Server on Debian
The article details a step-by-step Debian-based setup for a Minecraft Bedrock Edition server managed through the MCSManager (MCSM) web panel. It explains Bedrock Edition's cross-platform play and performance benefits, and why Debian is memory-efficient. The guide covers prerequisites (recommended 4-core/8GB RAM for ~15 players), port mapping for NAT servers, MCSM installation, installing the required libcurl library, running the official BDS server, and granting OP permissions. Readers gain a conveniently manageable multiplayer server accessible via web interface.
My blog website has been hit by CC attacks again. Here's a record
A sustained DDoS campaign targeted Zeruns’ image hosting and blog starting September 29, 2024. The first wave used 20GB of CDN traffic, with 1.1 billion HTTPS requests but only ~15 million billable due to QPS limits, causing a ¥50 loss. Logs totalled 16.54GB, analyzed via emed64. Attacks originated from numerous foreign IPs, mostly Android devices. Further attacks hit other domains on September 30 and October 1, consuming 380GB and costing ¥40.
《How To Ask Questions The Smart Way》 - Strongly Recommended to Read
This guide explains how to ask technical questions effectively in hacker and developer communities. Key principles: search archives, manuals, and web before asking; provide precise symptoms, environment, and prior research; choose appropriate forum; write clearly; and follow up with the solution. It also covers interpreting responses and answering helpfully. Readers gain practical strategies to attract useful answers, avoid being ignored, and contribute to community knowledge.
Open-Source 140W+65W Buck-Boost PD3.1 Fast-Charging Module (2C+1A Ports), IP6557+IP6538,
An open-source 205W buck-boost fast-charging module based on IP6557 and IP6538 is presented, offering 140W on one Type-C port with PD3.1 support and 65W on the second Type-C and Type-A ports. Maximum conversion efficiency reaches 96.7%. Full documentation and design files are provided, enabling users to replicate a cost-effective charger.
How to Install Minecraft Java Edition on Android: A Guide to Playing Java Minecraft on Your Phone
This article provides a step-by-step tutorial for installing Minecraft Java Edition on Android using the FCL launcher. It highlights FCL’s advantages, including support for versions 1.17 and above, a built-in Java runtime, and features like mod and shader support. The guide covers downloading the launcher, installing Java, selecting Minecraft 1.21.1, optionally installing Forge or Fabric, and launching the game.
QNAP TS-466C NAS Unboxing Review: 4-Bay NAS, N6005, Storage Server
Upgrading to the QNAP TS-466C four-bay NAS resolves performance lag; migrating drives from the old NAS preserves all settings. It features an Intel N6005, 8GB DDR4 expandable to 32GB, four HDD bays, two M.2 slots, dual 2.5GbE, and USB 3.2 Gen2. Testing showed 280MB/s transfers, good thermal control, and comprehensive software including Docker, cloud sync, and remote access, though system responsiveness feels somewhat sluggish.