int main()\n{\n\tCircle a(4);\n\tcout\u003C\u003C\"当前圆的面积为：\"\u003C\u003Ca.GetArea();\n\treturn 0;\n}

This is a C++ program that creates an object of the class Circle and calculates its area. The program starts with the main function that returns an integer value.

Inside the main function, a Circle object named 'a' is created with a radius of 4.

Then, the area of the circle is calculated using the 'GetArea' function of the Circle class and printed to the console using the 'cout' statement.

Finally, the program returns 0 to indicate successful execution.

Note that the code is indented using tabs (\t) for better readability.