56 lines
989 B
C++
56 lines
989 B
C++
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// 创建一个基类 Shape，其中包含一个纯虚函数 perimeter() ，用于计算形状的周长。从 Shape 派生出 Triangle 类和 Square 类，分别实现计算三角形和正方形的周长的函数。
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#include <iostream>
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#include <cstring>
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#include <cstdlib>
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using namespace std;
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class Shape
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{
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public:
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// 用于计算形状的周长
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virtual double perimeter() = 0;
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};
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class Triangle : public Shape
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{
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private:
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double a, b, c;
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public:
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Triangle(double a, double b, double c) : a(a), b(b), c(c) {}
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public:
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double perimeter()
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{
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return a + b + c;
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}
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};
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class Square : public Shape
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{
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private:
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double a;
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public:
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Square(double a) : a(a) {}
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public:
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double perimeter()
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{
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return 4 * a;
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}
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};
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int main()
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{
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Shape *p = new Triangle(3, 4, 5);
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cout << "三角形的周长是: " << p->perimeter() << endl;
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p = new Square(5);
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cout << "正方形的周长是: " << p->perimeter() << endl;
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return 0;
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}
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