Online slot machines are complex software programs coded using various programming languages and technologies. The core logic is typically written in languages like C++, Java, or JavaScript for web-based slots. The code controls the Random Number Generator （RNG）, which is the heart of the machine, ensuring each spin is independent and random. 
The RNG algorithm continuously generates numbers even when the game is not being played. When a player clicks the spin button, the code captures the current RNG value and maps it to a specific combination of symbols on the virtual reels. The game\“s payout rules, defined in the code, then determine if the spin is a winner and calculate the prize.
Graphics and animations are handled separately, often using HTML5, WebGL, or Flash （though declining）. Sound effects and music are integrated to enhance the user experience. The entire system is rigorously tested and certified by independent auditing agencies to ensure fairness and compliance with gambling regulations. |
