Complete the following program. Use the circle class and main to produce the output below.

class circle
{
static float Pi;
float radius;
public:
circle(float = 1.0);
static void changePi(float);
friend float area(const circle&);
};

...//area to complete

int main()
{
circle c(10.0);
cout << area(c) << endl;
circle::changePi(3.1416);
cout << area(c) << endl;
}

****** Program Output ******

314
314.16
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