update book code

eBook/exercises/chapter_7/min_max.go

@@ -0,0 +1,39 @@
+// Q13_1_max.go
+package main
+
+import (
+	"fmt"
+	"math"
+)
+
+func main() {
+	sl1 := []int{78,34,643,12,90,492, 13, 2}
+	max := maxSlice(sl1)
+	fmt.Printf("The maximum is %d\n", max)
+	min := minSlice(sl1)
+	fmt.Printf("The minimum is %d\n", min)
+}
+
+func maxSlice(sl []int) (max int) {
+	for _, v := range sl {
+		if v > max {
+			max = v
+		}
+	}
+	return 
+}
+
+func minSlice(sl [] int) (min int) {
+	// min = int(^uint(0) >> 1)     
+	min = math.MaxInt32  
+	for _, v := range sl {
+		if v < min {
+			min = v
+		}
+	}
+	return 
+}
+/* Output:
+The maximum is 643
+The minimum is 2
+*/