Guessing Game

Prerequisite: As always, we assume that we are working inside a terminal session running in our usual Docker container (as previously explained in Development Environment Setup).

Source code at `rust_playground/rs-ws/guessing_game

Some parts of the program, as well as some parts of this doc page, are taken from The Rust Book.

Setup

First of all, we create a new binary crate:

cd rs-ws
cargo new guessing_game --bin

You can find the code in the source file rust_playground/rs-ws/guessing_game/src/main.rs.

This app will need a dependency on the rand crate. In order to add the dependency, we can either manually modify the rust_playground/rs-ws/guessing_game/Cargo.toml file or use cargo add (and maybe update them after a while by means of cargo update)

In this case, let us follow the Rust book and directly modify the toml file:

[package]
name = "guessing_game"
version = "0.1.0"
edition = "2024"

[dependencies]
rand = "0.8.5"

and then, the next time we are going to build the project, Cargo will automatically take care of it.

Build and Run

We can build and run the guessing_game package by:

cargo run --package guessing_game --release

And we can play the guessing game, which will look like this:

-----------------------------
Welcome to the Guessing Game!

Rules:
- I have generated a random integer number within the range of 0 to 100 inclusive
- You have 10 attempts to guess the number
- For each attempt, I'll tell you whether your guess is lower, higher, or the exact number
-----------------------------

Attempt #1. Please input your guess and press <Enter>.
50
LOWER!

Attempt #2. Please input your guess and press <Enter>.
80
LOWER!

Attempt #3. Please input your guess and press <Enter>.
90
YOU WON!

-------------------
End of the program.
-------------------