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hpr3453 :: Rust 101: Episode 1 - Hello, World!

In which BlacKernel introduces the cargo tool and goes into detail on the rust hello world program

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Hosted by BlacKernel on 2021-10-27 is flagged as Explicit and is released under a CC-BY-SA license.
rust, programming, hello world, macros, functions. (Be the first).
The show is available on the Internet Archive at:

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Duration: 00:22:28

Programming 101.

A series focusing on concepts and the basics of programming

Talking Points

    • Like main.cpp in C++ or main.c in C
    • Tells the compiler which file to start with
    • Can link to other "crates" and "modules"
  • Cargo.toml
    • Keeps track of application metadata
    • This includes dependencies!
  • Functions
    • Strictly typed, like everything in Rust
    • Declared by fn
    • Argument typed with argument: Type
    • Return typed with -> Type otherwise assumed to return nothing
  • The Main Function
    • Like the main functions in C and C++
    • Where the program starts within the file
    • CLI arguments handled by std::env, rather than argv and argc in C
    • Can return nothing or a Result<()>
  • Macros
    • Metafunctions or functions for functions
    • More general than functions, having flexibility in the number of arguments, etc, but harder to write
  • The println! Macro
    • Can take any number of arguments that implement the display trait
    • Usually things like strings or character literals
    • Will format them into a string and display it on the terminal
    • Similar to printf in C
  • The Hello World program
    • Can be automagically generated with cargo new and then the name of your application
    • Located in Name-Of-Application/src/

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

Show Notes

Important Links:

Wikipedia Articles:

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