62 lines
1.5 KiB
C++
62 lines
1.5 KiB
C++
/*
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一圆型游泳池如图所示，现在需在其周围建一圆型过道，并在其四周围上栅栏。栅栏价格为35元/米，过道造价为20元/平方米。
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过道宽度为3米，游泳池半径由键盘输入。要求编程计算并输出过道和栅栏的造价。
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图形描述：大圆嵌套小圆：
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小圆在大圆中间，小圆为游泳池，大圆与小圆间隔为过道。
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*/
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#include<iostream>
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using namespace std;
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const float PI=3.14159;
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const float FencePrice=35;
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const float ConcretePrice=20;
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class Circle
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{
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private:
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float radius;
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public:
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Circle(float r);
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float Circumference() const;
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float Area() const;
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};
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Circle::Circle(float r)
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{
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radius=r;
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}
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// 计算圆的周长
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float Circle::Circumference() const
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{
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return 2 * PI * radius;
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}
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// 计算圆的面积
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float Circle::Area() const
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{
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return PI * radius * radius;
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}
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int main(int argc, char const *argv[])
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{
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float radius;
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float FenceCost, ConcreteCost;
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// 提示用户输入半径
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cout<<"Enter the radius of the pool: ";
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cin>>radius;
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// 声明 Circle 对象
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Circle Pool(radius);
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Circle PoolRim(radius + 3);
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// 计算栅栏造价并输出
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FenceCost = PoolRim.Circumference() * FencePrice;
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cout << "Fencing Cost is ￥" << FenceCost << endl;
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// 计算过道造价并输出
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ConcreteCost = (PoolRim.Area() - Pool.Area())*ConcretePrice;
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cout << "Concrete Cost is ￥" << ConcreteCost << endl;
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system("pause");
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return 0;
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}
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