day1 completed

src/day1.rs

@@ -0,0 +1,39 @@
+pub struct Data {
+    masses: Vec<i32>,
+}
+
+impl Data {
+    pub fn new() -> Data {
+        Data { masses: Vec::new() }
+    }
+    pub fn parse(&mut self, input: String) {
+        let mut mass: i32;
+        for line in input.split("\n") {
+            let sline = line.to_string();
+            if sline.len() >= 1 {
+                mass = sline.parse::<i32>().unwrap();
+                self.masses.push(mass);
+            }
+        }
+    }
+
+    pub fn compute1(&self) -> i32 {
+        let mut fuel: i32 = 0;
+        for mass in self.masses.iter() {
+            fuel += (mass / 3) - 2;
+        }
+        fuel
+    }
+
+    pub fn compute2(&self) -> i32 {
+        let mut total: i32 = 0;
+        for mass in self.masses.iter() {
+            let mut fuel = mass / 3 - 2;
+            while fuel > 0 {
+                total += fuel;
+                fuel = fuel / 3 - 2;
+            }
+        }
+        total
+    }
+}

src/main.rs

@@ -0,0 +1,32 @@
+use std::fs::File;
+use std::io::Read;
+
+mod day1;
+mod tests;
+
+fn main() {
+    match read_file("../day1.txt") {
+        Ok(input) => {
+            let mut data = day1::Data::new();
+            data.parse(input);
+            println!("Day1 Challenge1 result = {}", data.compute1());
+            println!("Day1 Challenge2 result = {}", data.compute2());
+        }
+        Err(msg) => {
+            println!("Error: {}", msg);
+        }
+    }
+}
+
+fn read_file(filename: &str) -> Result<String, std::io::Error> {
+    match File::open(filename) {
+        Ok(mut file) => {
+            let mut input = String::new();
+            match file.read_to_string(&mut input) {
+                Ok(_) => Ok(input),
+                Err(msg) => Err(msg),
+            }
+        }
+        Err(msg) => Err(msg),
+    }
+}

src/tests.rs

@@ -0,0 +1,91 @@
+use super::*;
+
+#[test]
+fn day1_11() {
+    let input = String::from("12");
+    let mut d1 = day1::Data::new();
+    d1.parse(input);
+    let res = d1.compute1();
+    assert_eq!(res, 2);
+}
+
+#[test]
+fn day1_12() {
+    let input = String::from("14");
+    let mut d1 = day1::Data::new();
+    d1.parse(input);
+    let res = d1.compute1();
+    assert_eq!(res, 2);
+}
+
+#[test]
+fn day1_13() {
+    let input = String::from("12\n14");
+    let mut d1 = day1::Data::new();
+    d1.parse(input);
+    let res = d1.compute1();
+    assert_eq!(res, 4);
+}
+
+#[test]
+fn day1_14() {
+    let input = String::from("1969");
+    let mut d1 = day1::Data::new();
+    d1.parse(input);
+    let res = d1.compute1();
+    assert_eq!(res, 654);
+}
+
+#[test]
+fn day1_15() {
+    let input = String::from("100756");
+    let mut d1 = day1::Data::new();
+    d1.parse(input);
+    let res = d1.compute1();
+    assert_eq!(res, 33583);
+}
+
+#[test]
+fn day1_21() {
+    let input = String::from("12");
+    let mut d1 = day1::Data::new();
+    d1.parse(input);
+    let res = d1.compute2();
+    assert_eq!(res, 2);
+}
+
+#[test]
+fn day1_22() {
+    let input = String::from("14");
+    let mut d1 = day1::Data::new();
+    d1.parse(input);
+    let res = d1.compute2();
+    assert_eq!(res, 2);
+}
+
+#[test]
+fn day1_23() {
+    let input = String::from("12\n14");
+    let mut d1 = day1::Data::new();
+    d1.parse(input);
+    let res = d1.compute2();
+    assert_eq!(res, 4);
+}
+
+#[test]
+fn day1_24() {
+    let input = String::from("1969");
+    let mut d1 = day1::Data::new();
+    d1.parse(input);
+    let res = d1.compute2();
+    assert_eq!(res, 966);
+}
+
+#[test]
+fn day1_25() {
+    let input = String::from("100756");
+    let mut d1 = day1::Data::new();
+    d1.parse(input);
+    let res = d1.compute2();
+    assert_eq!(res, 50346);
+}