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#ifndef CIRCLE_H
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#define CIRCLE_H
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#include <iostream>
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using namespace std;
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#define PI 3.14
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class Circle
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{
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private:
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double r;//半径
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public:
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Circle();//构造函数
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Circle(double R);//构造函数
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double Area();//求面积函数
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};
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Circle::Circle()
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{
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this->r=5.0;
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}
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Circle::Circle(double R)
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{
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this->r=R;
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}
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double Circle::Area()
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{
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return PI*r*r;
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}
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#endif
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