29 lines
839 B
Markdown
29 lines
839 B
Markdown
# First things first
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Chapter 1 takes you through an introduction to rustc -- an older version of compiling and running rust that predates Cargo. The first thing I did was create a 'Hello, world!' program.
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I also learned that when naming files, the convention is underscores:
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**Good**:
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hello_world.rs
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**Bad**:
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helloworld.rs
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# What does a Rust program look like?
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Here was our full hello world program:
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```rust
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fn main() {
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println!("Hello, world!");
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}
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```
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First, there's the fn main() function. This is always the first piece of code that will run in a Rust program.
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Second, indents always happen with 4 spaces, not a tab.
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Third, the print statement is doing something a little different. It is a *macro*, not a function. Macros use ! at the end, while functions do not.
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Fourth, each line ends with a semicolon. Much like C.
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