Go Euclid!

algs4/src/meatballhat.com/algs4-gcd/main.go

@@ -0,0 +1,38 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+)
+
+const USAGE string = `Usage: algs4-gcd <int> <int>`
+
+func gcd(p, q uint64) uint64 {
+	if q == 0 {
+		return p
+	}
+	r := p % q
+	return gcd(q, r)
+}
+
+func main() {
+	if len(os.Args) < 3 {
+		fmt.Println(USAGE)
+		os.Exit(1)
+	}
+
+	p, err := strconv.ParseUint(os.Args[1], 10, 0)
+	if err != nil {
+		fmt.Println("Wherps: ", err)
+		os.Exit(1)
+	}
+
+	q, err := strconv.ParseUint(os.Args[2], 10, 0)
+	if err != nil {
+		fmt.Println("Wherps: ", err)
+		os.Exit(1)
+	}
+
+	fmt.Println(gcd(p, q))
+}