Class defines a circle, calculate area and circumference of a circle. Requirements: member function respectively, and a friend function to find area and circumference of a circle.

新建文件夹
..........\yuanf.cpp
..........\yuanf.dsp
..........\yuanf.dsw
..........\yuanf.ncb
..........\yuanf.opt
..........\yuanf.plg

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