modify 07.1.md

eBook/examples/chapter_7/copy_append_slice.go

@@ -0,0 +1,15 @@
+package main
+import "fmt"
+
+func main() {
+    sl_from := []int{1, 2, 3}
+    sl_to := make([]int, 10)
+
+    n := copy(sl_to, sl_from)
+    fmt.Println(sl_to)
+    fmt.Printf("Copied %d elements\n", n) // n == 3
+
+    sl3 := []int{1, 2, 3}
+    sl3 = append(sl3, 4, 5, 6)
+    fmt.Println(sl3)
+}