moved exercises beneath common package

exercises/00-loops/go.go

@@ -0,0 +1,34 @@
+package main
+
+import (
+	"fmt"
+	"math"
+)
+
+const min_threshold = 1e-200
+
+func Sqrt(x float64, threshold float64) (z float64, iterations int) {
+	z = x
+	old_z := z
+	for {
+		z = z - (z*z-x)/(2*x)
+		if math.Abs(z-old_z) < threshold {
+			break
+		}
+		old_z = z
+		iterations++
+	}
+	return
+}
+
+func main() {
+	threshold := 1.0
+	right_answer := math.Sqrt(2)
+	for threshold > min_threshold {
+		answer, iterations := Sqrt(2, threshold)
+		fmt.Printf("%0.4g %0.4g %0.20f %0.20f %0.2d\n",
+			threshold, right_answer-answer, right_answer, answer,
+			iterations)
+		threshold = threshold / 10.0
+	}
+}

exercises/01-wc/go.go

@@ -0,0 +1,18 @@
+package main
+
+import (
+	"code.google.com/p/go-tour/wc"
+	"strings"
+)
+
+func WordCount(s string) map[string]int {
+	wc := make(map[string]int)
+	for _, v := range strings.Fields(s) {
+		wc[v] += 1
+	}
+	return wc
+}
+
+func main() {
+	wc.Test(WordCount)
+}

exercises/02-pic/go.go

@@ -0,0 +1,18 @@
+package main
+
+import "code.google.com/p/go-tour/pic"
+
+func Pic(dx, dy int) [][]uint8 {
+	result := make([][]uint8, dy)
+	for j := 0; j < dy; j++ {
+		result[j] = make([]uint8, dx)
+		for i := 0; i < dx; i++ {
+			result[j][i] = uint8(i) ^ uint8(j)
+		}
+	}
+	return result
+}
+
+func main() {
+	pic.Show(Pic)
+}