From 4abb6279cf879def32d2aba94eb304978e26049e Mon Sep 17 00:00:00 2001
From: MX <3037347690@qq.com>
Date: Sun, 4 Oct 2026 14:56:00 +0800
Subject: [PATCH] =?UTF-8?q?=E4=B8=8A=E4=BC=A0=E6=96=87=E4=BB=B6=E8=87=B3?=
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+先定义父类Shape和方法area，并且area要return 0
+子类Circle和Square要重写area，使用其面积公式
+主程序先输入side和r，然后列表main存放两个字类，并且使用for循环逐个输出
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