initial commit

02-dive!/src/main.rs

@@ -0,0 +1,33 @@
+#![allow(dead_code, unused_imports)]
+use std::fs::File;
+use std::path::Path;
+use std::io::{self, BufRead};
+fn main() {
+  let mut h = 0;
+  let mut v = 0;
+  let mut aim = 0;
+  if let Ok(lines) = read_lines("directions.txt") {
+    for line in lines {
+      if let Ok(val) = line {
+        println!("{}", val);
+        //shadow assignment
+        let val: Vec<&str> = val.split(' ').collect();
+        let cmd = val[0];
+        let n = val[1].parse::<u32>().unwrap();
+        match cmd {
+          "forward" => {h += n; v += n * aim },
+          "down" => aim += n,
+          "up" => aim -= n,
+          _ => println!("not a command"),
+        }
+      }
+    }
+  }
+  println!("h: {}, v: {}, final position: {}", h, v, h * v );
+}
+
+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())
+}