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Rust basics

master
six 7 months ago
commit
1d01d94882
  1. 8
      0000_notes.txt
  2. 8
      000_println.rs
  3. 24
      010_add_distract_math_literal_operator.rs
  4. 62
      020_tuples.rs
  5. 4
      021_tuples_simple.rs
  6. 14
      100_tcp_listen_thread_answer.rs
  7. BIN
      compiled/000_println
  8. BIN
      compiled/010_add_distract_math_literal_operator
  9. BIN
      compiled/020_tuples
  10. BIN
      compiled/021_tuples_simple
  11. BIN
      compiled/100_tcp_listen_thread_answer

8
0000_notes.txt

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# Building for example a lib such as "rust-syslog" - This needs exec privilege on the target partition.
cargo build
# Add external !built! crate
rustc -L /home/extern/path asd.rs
rustc asd.rs --extern /home/path/lib

8
000_println.rs

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//https://doc.rust-lang.org/rust-by-example/hello/print.html
fn main() {
// Comment
/* Multi line */
println!("Printed text.");
print!("No new line.");
}

24
010_add_distract_math_literal_operator.rs

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//https://doc.rust-lang.org/rust-by-example/primitives/literals.html
fn main() {
println!("1 + 2 = {}", 1u32 + 2);
println!("1 + 2 = {}", 32 + 2);
println!("1 - 2 = {}", 1i32 - 2);
//println!("1 - 2 = {}", 1u32 - 2); // panic because of overflow
// Short-circuiting boolean logic
println!("true AND false is {}", true && false);
println!("true OR false is {}", true || false);
println!("NOT true is {}", !true);
// Bitwise operations
println!("0011 AND 0101 is {:04b}", 0b0011u32 & 0b0101);
println!("0011 OR 0101 is {:04b}", 0b0011u32 | 0b0101);
println!("0011 XOR 0101 is {:04b}", 0b0011u32 ^ 0b0101);
println!("1 << 5 is {}", 1u32 << 5);
println!("0x80 >> 2 is 0x{:x}", 0x80u32 >> 2);
// Use underscores to improve readability!
println!("One million is written as {}", 1_000_000u32);
}

62
020_tuples.rs

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// https://doc.rust-lang.org/rust-by-example/primitives/tuples.html
// Tuples can be used as function arguments and as return values
fn reverse(pair: (i32, bool)) -> (bool, i32) {
// `let` can be used to bind the members of a tuple to variables
let (integer, boolean) = pair;
(boolean, integer)
}
// The following struct is for the activity.
#[derive(Debug)]
struct Matrix(f32, f32, f32, f32);
fn main() {
// ---------- //
// A tuple with a bunch of different types
let long_tuple = (1u8, 2u16, 3u32, 4u64,
-1i8, -2i16, -3i32, -4i64,
0.1f32, 0.2f64,
'a', true);
// Values can be extracted from the tuple using tuple indexing
println!("long tuple first value: {}", long_tuple.0);
println!("long tuple second value: {}", long_tuple.1);
// ---------- //
// Tuples can be tuple members
let tuple_of_tuples = ((1u8, 2u16, 2u32), (4u64, -1i8), -2i16);
// Tuples are printable
println!("tuple of tuples: {:?}", tuple_of_tuples);
// But long Tuples cannot be printed
// let too_long_tuple = (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13);
// println!("too long tuple: {:?}", too_long_tuple);
// TODO ^ Uncomment the above 2 lines to see the compiler error
let pair = (1, true);
println!("pair is {:?}", pair);
println!("the reversed pair is {:?}", reverse(pair));
// To create one element tuples, the comma is required to tell them apart
// from a literal surrounded by parentheses
println!("one element tuple: {:?}", (5u32,));
println!("just an integer: {:?}", (5u32));
//tuples can be destructured to create bindings
let tuple = (1, "hello", 4.5, true);
let (a, b, c, d) = tuple;
println!("{:?}, {:?}, {:?}, {:?}", a, b, c, d);
let matrix = Matrix(1.1, 1.2, 2.1, 2.2);
println!("{:?}", matrix);
}

4
021_tuples_simple.rs

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fn main() {
let tuplex = ("first", "and", 3);
print!("The {} {}", tuplex.1, tuplex.2);
}

14
100_tcp_listen_thread_answer.rs

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use std::net::TcpListener;
use std::thread;
use std::io::Write;
fn main() {
let listener = TcpListener::bind("127.0.0.1:8081").unwrap();
for stream in listener.incoming() {
thread::spawn(|| {
let mut stream = stream.unwrap();
stream.write(b"Hello, that's an answer.\r\n").unwrap();
});
}
}

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compiled/020_tuples

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compiled/100_tcp_listen_thread_answer

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