Задача на описание функции Leng(x_A, y_A, x_B, y_B) вещественного типа

#include <iostream.h>
#include <conio.h>
#include <math.h>
 
double Leng(double x1, double y1, double x2, double y2)
{
    return sqrt(pow((x1 - x2), 2) + pow((y1 - y2), 2));
}
 
 
int main()
{
    double Ax, Ay, Bx, By, Cx, Cy, Dx, Dy;
    
    cout << "Enter A(x,y): " << endl;
    cin >> Ax >> Ay;
    cout << "Enter B(x,y): " << endl;
    cin >> Bx >> By;
    cout << "Enter C(x,y): " << endl;
    cin >> Cx >> Cy;
    cout << "Enter D(x,y): " << endl;
    cin >> Dx >> Dy;
    
    cout << endl << "AB: " << Leng(Ax, Ay, Bx, By) << endl;
    cout << "AC: " << Leng(Ax, Ay, Cx, Cy) << endl;
    cout << "AD: " << Leng(Ax, Ay, Dx, Dy) << endl;
 
    getch();
    return 0;
}