53 lines
1007 B
C++
53 lines
1007 B
C++
// 类模版
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// 类模版是成员变量的数据类型泛化
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// 类模版的声明作用于整个类，而不是单个成员，即类的内部的任何位置都可以使用
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// 如: 定义长方形的图形类
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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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// 类模版
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template <typename T>
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class Rectangle
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{
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private:
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T width, height; //矩形的宽和高
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public:
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Rectangle(T w, T h) : width(w), height(h) {}
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public:
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void draw()
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{
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cout << "绘制矩形"
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<< "宽: " << width << "高: " << height << endl;
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}
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void length()
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{
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cout << "矩形周长: " << 2 * (width + height) << endl;
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}
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};
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int main()
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{
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cout << "r1: " << endl;
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Rectangle<int> r1(10, 20);
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r1.draw();
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r1.length();
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cout << "r2: " << endl;
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Rectangle<double> r2(10.53, 20.25);
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r2.draw();
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r2.length();
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cout << "r3: " << endl;
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Rectangle<float> r3(10.2f, 20.2f);
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r3.draw();
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r3.length();
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return 0;
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} |