update book code

eBook/examples/chapter_6/varnumpar.go

@@ -0,0 +1,28 @@
+package main
+
+import "fmt"
+
+func main() {
+	x := Min(1, 3, 2, 0) 
+	fmt.Printf("The minimum is: %d\n", x)
+	arr := []int{7,9,3,5,1}
+	x = Min(arr...) 
+	fmt.Printf("The minimum in the array arr is: %d", x)
+}
+
+func Min(a ...int) int {
+  if len(a)==0 {
+    return 0
+  }
+  min := a[0]
+  for _, v := range a {
+    if v < min {
+      min = v
+    }
+  }
+  return min
+}
+/*
+The minimum is: 0
+The minimum in the array arr is: 1
+*/