Creating Your First Rust Program

Creating a program that greets the user with “Hello, World” is a very popular way to test a new programming language.

When we start a project with cargo new, Rust creates “Hello, world!” for us. It also creates the necessary meta-data for Cargo to run our program.

Cargo Meta-data

We’ll open the Cargo.toml file created in our hello project:

This file describes our program and how to build it. It uses the TOML format (Tom’s Obvious, Minimal Language) and divides crate information into sections. The [package] section describes our crate; if we publish our crate, if we publish our crate, this information will be used to describe it to potential users. It can be extended to include a lot of information about our project.

Cargo has created everything we need to run “Hello, world”, so we don’t have to edit the Cargo.toml file if we don’t want to. The default entries are:

• name: : This is the name of your ...