flag&new

new/new.go

@@ -0,0 +1,14 @@
+package main
+
+import "fmt"
+
+func main() {
+	a := new(int)
+	fmt.Println(*a) //0
+	var i int
+	b := &i
+	fmt.Println(*b) //0
+	age := delta(1998, 2021)
+	fmt.Printf("Age = %d", age)
+}
+func delta(old, new int) int { return new - old }