How to program snake on Ti-84 Plus CE

The video script introduces a tutorial on how to program a snake game on a TI-84 Plus CE calculator. The presenter demonstrates the snake game, explaining the game mechanics such as growing the snake by eating food, and the consequences of hitting the screen edge or the snake's body. The tutorial offers a bonus video incentive for likes and provides the snake game's download and source code in the video description. It also promotes the presenter's previous 'pong' game program and encourages viewers to check it out.

This paragraph details the initial steps for setting up the snake game development environment on the TI-84 Plus CE calculator. It explains how to access the program editor, create a new program named 'snake', and input the first ten lines of code that involve storing variables essential for the game's functionality. These variables include 'g' for the get key command, 'c' for the death Boolean, 's' for the score, 'x' and 'y' for the snake's coordinates, 'v' and 'u' for the tail's coordinates, 'd' for the snake's direction, and 't' for the tail Boolean.

The script continues with instructions on how to delete and create a matrix named 'a' with dimensions 10 by 26, which corresponds to the game screen size. It then describes using a for loop to generate five random food items on the board, represented by the number 5 in the matrix. The food's coordinates are determined by random integer commands, and the food is displayed on the screen using output commands.

The paragraph explains the implementation of a while loop that runs as long as the snake is alive, signified by the death Boolean 'c'. It details the process of displaying the snake's head on the screen using the snake's coordinates 'y' and 'x'. The script also includes an if conditional to increase the score 's' and visually grow the snake by setting the tail Boolean 't' when the snake eats food. Additionally, it sets up another while loop to place new food on the screen, ensuring the food doesn't appear on the snake and maintains an enjoyable gameplay experience.

This section of the script discusses the conditions that lead to the snake's death, such as running into itself or reaching a body length of 200, which is a win condition. It also outlines the get key commands to handle user input for snake movement and uses if conditionals to change the snake's direction without causing it to reverse into itself. The paragraph ensures the snake's movement is restricted within the screen boundaries to prevent errors.

The script explains the use of implicit conditionals to control the tail's movement based on the snake's direction. It details how to update the tail's coordinates 'u' and 'v' and how to manage the tail's appearance to avoid the snake running into itself. The paragraph also includes steps to output spaces at the tail's previous position to give the illusion of a retracting tail as the snake moves.

The final part of the script describes the end-game conditions, such as displaying 'game over' and the player's score when the snake dies or wins by reaching a length of 200. It provides instructions for outputting the words 'game over' and 'you win' at specific screen coordinates, along with the player's score. The script concludes with how to exit the program editor and run the completed snake game.