c++第二次作业2

#include <iostream>
#include <cmath>
using namespace std;
int main ()
{
	int x1,x2,y1,y2,l;
	cout<<"x1="<<"y1="<<"x2="<<"y2=";
	cin>>x1>>y1>>x2>>y2;
	l=sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));
	cout<<l;
	return 0;
}