rust basic -- types and ownership

2022-09-29 diff --git a/public/categories/index.html b/public/categories/index.html index addaa1a..bb154ac 100644 --- a/public/categories/index.html +++ b/public/categories/index.html @@ -38,7 +38,7 @@

/code - (3) + (4)

diff --git a/public/index.html b/public/index.html index 44f11a4..51cc3e5 100644 --- a/public/index.html +++ b/public/index.html @@ -35,6 +35,34 @@ +

2023

+ + +

+ 2023-01-12 +

+ +

+ rust basic -- types and ownership +

+ +

+ + + /code + + + + + + #rust + + +

+ +

2022

diff --git a/public/post/index.html b/public/post/index.html index 44f11a4..51cc3e5 100644 --- a/public/post/index.html +++ b/public/post/index.html @@ -35,6 +35,34 @@ +

2023

+ + +

+ 2023-01-12 +

+ +

+ rust basic -- types and ownership +

+ +

+ + + /code + + + + + + #rust + + +

+ +

2022

diff --git a/public/post/no-problemo/index.html b/public/post/no-problemo/index.html index cb80737..3742499 100644 --- a/public/post/no-problemo/index.html +++ b/public/post/no-problemo/index.html @@ -55,9 +55,9 @@

My feeling to express are fading... Not sure how I know it, just got this sense.

Recently, I picked up an anime named "The Simpsons" which I watched first episode back in highschool. This first time was not gave me too much impression. -but I fell in love with it right after re-watched first episode! So I downloaded the series up to 17.(33 in total but I'm not in rush) +but I fell in love with it right after re-watched first episode! So I downloaded the half of the whole series. simpson tv list

It double

The anime is just about

diff --git a/public/post/rust-basic/index.html b/public/post/rust-basic/index.html new file mode 100644 index 0000000..262aee3 --- /dev/null +++ b/public/post/rust-basic/index.html @@ -0,0 +1,107 @@ + + + + + + +rust basic -- types and ownership | garhve's gibberish + + + + + + + + + + + + + + +

+ +

rust basic -- types and ownership

2023-01-12

+ + + /code + + + + + #rust + + +

+ +

Types

+
This is a summary of rust basic knowledge I learned from (Rust the Book)[https://doc.rust-lang.org/book/] chapter 1 ~ chapter 13 +I will use C to compare with since I familiar it.
+

There are a bunch of built-in types we can work with: scalar types and compound types. +Those scalar types are just alike as C language. +| scalar types | rust | c | +| ------------- |------------- | ------- | +| integer | i(u)8/i16/i32/i64 | (unsigned) char/short/int/long | +| float | f32/f64 | float/double | +| boolean | true/false | True/False (non-zero/zero) | +| character | char | char |

The compound types are a bit different. rust provides many hands-on types where C type is not the same or needs to define explicitly.

+ + + + + + +

compound type	rust	c
struct	same	same
enum	enum element can be seen as key that could take value	represent numberic value, default starting from 0
array	vector	array
string	a wraper of vector	pointer of char *
tuple	exist	no such type in C

Variable declaration in rust is kinda tricky.

A normal declare syntax would be like let unmutable_variable = 3. This will imply that variable is i32 type +since the value we assign to is a integer and the default type for integer on most OS is i32. +We can explicit type by using type annotation: let unmutable_variable: u8 = 3. This will make variable +unmutable_variable is u8 type and has 3 as its value. We need to assign a value +to variable if we don't annotate type while declaration, otherwise compiler would prompt error.

Notice that, declaration as above one won't allow us to change value, if we want to be able to change variable's +value at runtime, we need to explicit it, for security reason:

let mut mutable_variable = 3;
+println!("first define: {mutable_variable}");
+mutable_variable = 5;
+
+println!("change value to: {mutable_variable}");
+

+
println!() is called macro, which would not cover for now.
+

+ +

+ + + + +

+ + + + + diff --git a/public/sitemap.xml b/public/sitemap.xml index 02cae4b..89cf628 100644 --- a/public/sitemap.xml +++ b/public/sitemap.xml @@ -58,6 +58,10 @@ https://blog.garhve.com/post/past-is-great/ 2022-11-07 + + https://blog.garhve.com/post/rust-basic/ + 2023-01-12 + https://blog.garhve.com/post/sui-bi-1/ 2022-12-20 @@ -77,4 +81,7 @@ https://blog.garhve.com/tags/linux/ + + https://blog.garhve.com/tags/rust/ + diff --git a/public/tags/index.html b/public/tags/index.html index 64ba538..3aa2945 100644 --- a/public/tags/index.html +++ b/public/tags/index.html @@ -56,6 +56,11 @@ (1)

+ #rust + (1) +