Initial commit

test/grammer/oop/04.dart

@@ -0,0 +1,40 @@
+class Human {
+  String name = '';
+  double weight = 0;
+  double height = 0;
+
+  Human(this.name, this.weight, this.height);
+
+  double bmi() {
+    double result = weight / ((height/100) * (height/100));
+    return result;
+  }
+
+  String info() {
+    return "Human: name{${name},weight:${weight}kg,height:${height}cm}";
+  }
+}
+
+class Student extends Human {
+  final String school;
+
+  Student(
+    super.name,
+    super.weight,
+    super.height, {
+    required this.school,
+  });
+
+  @override
+  String info() {
+    String info = super.info() + "school: $school ";
+    return info;
+  }
+
+}
+
+void main() {
+  Student toly = Student("捷特", 70, 180,school: "安徽建筑大学");
+  print(toly.bmi());
+  print(toly.info());
+}