Day 1

01/part1.rs

@@ -0,0 +1,30 @@
+use std::error::Error;
+use std::fs::File;
+use std::io::BufReader;
+use std::io::prelude::*;
+
+fn main() -> std::io::Result<()> {
+    let file = match File::open("input") {
+        // The `description` method of `io::Error` returns a string that describes the error
+        Err(why) => panic!("couldn't open input: {}", Error::description(&why)),
+        Ok(file) => file,
+    };
+
+    let reader = BufReader::new(file);
+    let lines = reader.lines();
+
+    let mut total: i128 = 0;
+
+    for result in lines {
+        let l = result.unwrap();
+        let offset:i128 = i128::from_str_radix(&l, 10).unwrap();
+
+        println!("{} => {}", l, offset);
+
+        total = total + offset;
+    }
+
+    println!("{}", total);
+
+    Ok(())
+}