求平面上两点距离

#include<iostream.h>
#include<math.h>
class a5
{
public:
	float point(int a1,int a2,int b1,int b2)
	{
        return (float)sqrt((a1-b1)*(a1-b1)+(a2-b2)*(a2-b2));
	}
	float point(float a1,float a2,float b1,float b2)
	{
        return  (float)sqrt((a1-b1)*(a1-b1)+(a2-b2)*(a2-b2));
	}
};
void main()
{
    
	float a,b,c,d;
	int j;
	a5 dis;
	for(int i=0;;i++)
	{
		cout<<"请输入一点的横纵坐标"<<endl;                                                              求平面上两点之间的距离
	    cin>>a>>b;
	    cout<<"请输入另一点的横纵坐标"<<endl;
	    cin>>c>>d;
	    if(a==(int)a)
			cout<<"平面上这两点的距离为："<<dis.point((int) a,(int) b,(int) c,(int) d)<<endl;
	    else
			cout<<"平面上这两点的距离为："<<dis.point(a,b,c,d)<<endl;
	    cout<<"如果想继续输入请按1，否则按0"<<endl;
	    cin>>j;
	    if(j)
	        continue;
        else
	    	break;
	}


}