CPP 两点间的距离 （函数模板）

题目

代码

#include <iostream>
#include <cmath>
using namespace std;
template <class T>
class d
{
private:
    T x1;
    T y1;
    T x2;
    T y2;
public:

    d(int i_x1,int i_y1, int i_x2, int i_y2)
    {
        x1=i_x1;
        x2=i_x2;
        y1=i_y1;
        y2=i_y2;
    }
    d(double i_x1,double i_y1, double i_x2, double i_y2)
    {
        x1=i_x1;
        x2=i_x2;
        y1=i_y1;
        y2=i_y2;
    }
    
    T distance( T x1, T y1, T x2, T y2)
    {
        return sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));
    }
};
int main( )
{
    int i_x1, i_y1, i_x2, i_y2;
    double d_x1, d_y1, d_x2, d_y2;
    
    cin>>i_x1>>i_y1>>i_x2>>i_y2;
    cin>>d_x1>>d_y1>>d_x2>>d_y2;
    
    d<int> d1(i_x1, i_y1, i_x2, i_y2);
    d<double> d2( d_x1, d_y1, d_x2, d_y2);
    
    cout<<d1.distance( i_x1, i_y1, i_x2, i_y2 )<<endl;
    cout<<d2.distance(d_x1, d_y1, d_x2, d_y2 )<<endl;
    return 0；
 }