To set up Visual Studio Code for Rust development, you will need to install the Rust compiler and tools, and then install the Visual Studio Code extension for Rust. Here are the steps:

1. First, you will need to install Rust on your machine. You can do this by following the instructions on the Rust website:

• Windows: https://www.rust-lang.org/tools/install/windows
• macOS: https://www.rust-lang.org/tools/install/mac
• Linux: https://www.rust-lang.org/tools/install/linux

2. Next, open Visual Studio Code and install the Rust extension by doing the following:

• Press Ctrl + Shift + X to open the extensions panel.
• In the search box, type “Rust” and press Enter.
• Click the Install button for the Rust extension.

3. Finally, open a Rust file in Visual Studio Code to trigger the extension to automatically install the required Rust tools (e.g. rustfmt, rust-analyzer).

That’s it! You should now be able to develop Rust programs using Visual Studio Code. If you run into any issues, you can try the troubleshooting steps in the Rust extension documentation: https://github.com/rust-lang/rust-vscode/blob/master/TROUBLESHOOTING.md

To create a “Hello, world!” program in Rust, you can use the following steps:

1. Open a new file in your text editor, and type the following code:

fn main() {
    println!("Hello, world!");
}

2. Save the file as “hello.rs”.
3. Open a terminal window, and navigate to the directory where you saved the file.
4. Compile the program by typing the following command:

rustc hello.rs

5. Run the program by typing the following command:

./hello

You should see the output “Hello, world!” printed to the terminal.

Here are four functions that perform addition, subtraction, multiplication, and division in Rust:

fn add(x: i32, y: i32) -> i32 {
    x + y
}

fn subtract(x: i32, y: i32) -> i32 {
    x - y
}

fn multiply(x: i32, y: i32) -> i32 {
    x * y
}

fn divide(x: i32, y: i32) -> i32 {
    x / y
}

These functions take two arguments, x and y, and return the result of the corresponding arithmetic operation. The -> i32 syntax is called a “return type”, and it indicates that the function will return a value of type i32.

To use these functions, you can call them in your code like this:

let sum = add(10, 20);
let difference = subtract(10, 20);
let product = multiply(10, 20);
let quotient = divide(10, 20);

hese calls will assign the values 30, -10, 200, and 0 to the variables sum, difference, product, and quotient, respectively.