Implementing the "RandomSeq" example

with supporting implementation of `StdRandom.uniform`

algs4/src/go/Makefile

@@ -4,7 +4,8 @@ TARGETS := \
 	$(REPO_BASE)/algs4-binarysearch \
 	$(REPO_BASE)/algs4-flips \
 	$(REPO_BASE)/algs4-gcd \
-	$(REPO_BASE)/algs4-rolls
+	$(REPO_BASE)/algs4-rolls \
+	$(REPO_BASE)/algs4-randomseq
 
 test: build
 	go test -x $(TARGETS)

algs4/src/go/algs4-randomseq/main.go

@@ -0,0 +1,42 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"strconv"
+)
+
+import (
+	"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 an int and two floats!"))
+	}
+	n, err := strconv.Atoi(os.Args[1])
+	if err != nil {
+		die(err)
+	}
+
+	lo, err := strconv.ParseFloat(os.Args[2], 32)
+	if err != nil {
+		die(err)
+	}
+
+	hi, err := strconv.ParseFloat(os.Args[3], 32)
+	if err != nil {
+		die(err)
+	}
+
+	for i := 0; i < n; i++ {
+		x := algs4.RandomUniform(lo, hi)
+		fmt.Printf("%.2f\n", x)
+	}
+}

algs4/src/go/algs4/random.go

@@ -0,0 +1,14 @@
+package algs4
+
+import (
+	"math/rand"
+	"time"
+)
+
+func init() {
+	rand.Seed(time.Now().UTC().UnixNano())
+}
+
+func RandomUniform(min, max float64) float64 {
+	return rand.Float64()*(max-min) + min
+}