按下面的格式要求用户输入摄氏温度值；定义一个Circle类，有数据成员Radius（半径）；根据坐标求矩阵面积；矩阵链乘；设计并测试一个名为Rectangle的矩形类-In the following format requires the user to enter the Celsius temperature value　defines a Circle class, the data Members of the Radius (radius)　The Matrix area based on the coordinates　Chain matrix multiplication　Design and test a rectangular called Rectangle category