Filling in Date implementation

algs4/src/go/Makefile

@@ -7,7 +7,8 @@ TARGETS := \
 	$(REPO_BASE)/algs4-rolls \
 	$(REPO_BASE)/algs4-randomseq \
 	$(REPO_BASE)/algs4-average \
-	$(REPO_BASE)/algs4-interval2d
+	$(REPO_BASE)/algs4-interval2d \
+	$(REPO_BASE)/algs4-date
 
 test: build
 	go test -x $(TARGETS)

algs4/src/go/algs4-date/main.go

@@ -0,0 +1,39 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"strconv"
+
+	"github.com/meatballhat/box-o-sand/algs4/src/go/algs4"
+)
+
+func die(err error) {
+	fmt.Fprintf(os.Stderr, "ERROR: %v\n", err)
+	os.Exit(1)
+}
+
+func main() {
+	if len(os.Args) < 4 {
+		die(errors.New("We need 3 ints!"))
+	}
+
+	m, err := strconv.Atoi(os.Args[1])
+	if err != nil {
+		die(err)
+	}
+
+	d, err := strconv.Atoi(os.Args[2])
+	if err != nil {
+		die(err)
+	}
+
+	y, err := strconv.Atoi(os.Args[3])
+	if err != nil {
+		die(err)
+	}
+
+	date := algs4.NewDate(m, d, y)
+	fmt.Println(date)
+}

algs4/src/go/algs4/date.go

@@ -0,0 +1,23 @@
+package algs4
+
+import (
+	"fmt"
+)
+
+type Date struct {
+	Month int
+	Day   int
+	Year  int
+}
+
+func NewDate(m, d, y int) *Date {
+	return &Date{
+		Month: m,
+		Day:   d,
+		Year:  y,
+	}
+}
+
+func (me *Date) String() string {
+	return fmt.Sprintf("%d/%d/%d", me.Month, me.Day, me.Year)
+}