day 2a complete

day2/2a/go.mod

@@ -0,0 +1,3 @@
+module PWD
+
+go 1.17

day2/2a/main.go

@@ -0,0 +1,63 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func main() {
+	content := returnContent("../input")
+
+	horizontal, depth := followGuidance(content)
+
+	fmt.Println(horizontal * depth)
+
+}
+
+func returnContent(path string) *[]string {
+	//read file and return it as an array of integers
+
+	file, err := os.Open(path)
+	var content []string
+
+	if err != nil {
+		fmt.Println("Unlucky, the file didn't open")
+		return &content
+	}
+	defer file.Close()
+
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		content = append(content, scanner.Text())
+	}
+
+	return &content
+}
+
+func followGuidance(content *[]string) (horizontal int, depth int) {
+
+	for i := 0; i < len(*content); i++ {
+		currentLine := strings.Split((*content)[i], " ")
+
+		value, err := strconv.Atoi(currentLine[1])
+
+		if err != nil {
+			fmt.Println("Uh oh, couldn't find the key! There was an issue with the sonar")
+		}
+
+		switch currentLine[0] {
+		//instructions say that up and down are reversed as we are in the submarine
+		case "up":
+			depth -= value
+		case "down":
+			depth += value
+		default:
+			horizontal += value
+		}
+	}
+	return
+
+}