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Dane Sabo 2025-04-07 15:11:11 -04:00
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3-99 Research/Rust/Chapter 3 - Common Programming Concepts.md
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@ -61,6 +61,34 @@ fn main() {
Constants are by convention written in UPPER_CAMEL_CASE.
# 3.2 Data Types
Rust is a statically typed language. Variables in Rust must have their types
known at compile time, or else the compilation will fail. A lot of times types
can be inferred, but this is not possible for cases where there are multiple
possible types.
For these cases, the type must be annotated, like this:
```rust
let annotated: str = "This one is annotated!";
let not_annotated = "This one is not!";
```
## Scalar Types
Scalar types are those that only take on one object. Examples in Rust are
integers, characters, booleans, and floating-point numbers.
Integers can be signed or unsigned, with different levels of bit resolution,
up to 128 bits. That being said, there is an 'arch' length that is the size of
the operating system. This is used with `isize` and `usize`. Signed integers are
stored with two's complement.
Numbers can also be written in differnet formats, including decimals (with _
escapes), hex values, octal values, binary values, or even as a byte(b'A').
>[!note] A special note about *integer overflow*.
> Rust code compiled and ran in debug mode will have checks for integer
> overflow, causing the code to panic at runtime if an overflow occurs.
> Production code compiled with the `--release` flag will NOT panic however,
> but instead will wrap around to the first value in the possible range.
# 3.3 Functions

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3-99 Research/Rust/guessing_game/target/.rustc_info.json
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