47 lines
806 B
C++
47 lines
806 B
C++
|
// 类模版派生普通类
|
||
|
|
#include <iostream>
|
||
|
|
#include <cstring>
|
||
|
|
#include <cstdlib>
|
||
|
|
|
||
|
|
using namespace std;
|
||
|
|
|
||
|
|
template <typename T>
|
||
|
|
class Shape
|
||
|
|
{
|
||
|
|
protected:
|
||
|
|
T iPerimeter;
|
||
|
|
|
||
|
|
public:
|
||
|
|
// virtual double area() = 0;
|
||
|
|
virtual T perimeter() { return iPerimeter; } // 周长
|
||
|
|
};
|
||
|
|
|
||
|
|
class Rectangle : public Shape<int>
|
||
|
|
{
|
||
|
|
private:
|
||
|
|
int width, height;
|
||
|
|
|
||
|
|
public:
|
||
|
|
Rectangle(int w, int h) : width(w), height(h) { iPerimeter = 2 * (w + h); }
|
||
|
|
};
|
||
|
|
|
||
|
|
class Triangle : public Shape<float>
|
||
|
|
{
|
||
|
|
private:
|
||
|
|
float a, b, c;
|
||
|
|
|
||
|
|
public:
|
||
|
|
Triangle(float a, float b, float c) : a(a), b(b), c(c) { iPerimeter = a + b + c; }
|
||
|
|
};
|
||
|
|
|
||
|
|
int main()
|
||
|
|
{
|
||
|
|
Rectangle r1(10, 20);
|
||
|
|
cout << "r1周长: " << r1.perimeter() << endl;
|
||
|
|
|
||
|
|
Triangle t1(3.0f, 4.0f, 5.0f);
|
||
|
|
cout << "t1周长: " << t1.perimeter() << endl;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|