rust

3-99 Research/Rust/Chapter 3 - Common Programming Concepts.md

@@ -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
 

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

@@ -1 +1 @@
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