day 2 in rust

day02/.gitignore

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+/target

day02/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day02"
+version = "0.1.0"

day02/Cargo.toml

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+[package]
+name = "day02"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day02/src/main.rs

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+use std::fs::File;
+use std::io::{self, BufRead};
+use std::path::Path;
+
+fn main() {
+    let mut depth = 0;
+    let mut pos_h = 0;
+    if let Ok(lines) = read_lines("./data/input") {
+        for line in lines {
+            if let Ok(str) = line {
+                let words: Vec<&str> = str.split_whitespace().collect();
+                let direction = words[0];
+                let number = words[1].parse::<i32>().unwrap();
+
+                match direction {
+                    "down" => depth = depth + number,
+                    "up" => depth = depth - number,
+                    "forward" => pos_h = pos_h + number,
+                    _ => eprintln!("UNKNOWN!!!!!"),
+
+                }
+            }
+        }
+    }
+    println!("{}", depth * pos_h);
+}
+
+fn read_lines<P>(filename: P) -> io::Result<io::Lines<io::BufReader<File>>>
+where P: AsRef<Path>, {
+    let file = File::open(filename)?;
+    Ok(io::BufReader::new(file).lines())
+}