在线求助问题。初学C++ 有一道题不会写。想求助学习。

Write a program that calculates the distance of 2 points from the origin, as well as from each other. The distance between 2 points can be calculated using the formula:
d=√(〖(x_2-x_1)〗^2+〖(y_2-y_1)〗^2+〖(z_2-z_1)〗^2 )

1. Read the coordinates of 2 3D points from the user. A point is represented by its x, y, and z coordinates.
2. Calculate and print the distance of the first point from the origin, (0, 0, 0).
3. Calculate and print the distance of the second point from the origin.
4. Calculate and print the distance between the two points.

这不是都有公式了么

#include <iostream>
#include <math>
using namespace std;

double dist(double x1,double x2,double y1,double y1,double z1,double z2)
{
return sqrt((x2-x1)*(x2-x1) + (y2-y1)*(y2-y1) + (z2-z1)*(z2-z1));
}
int main()
{
double x1,x2,y1,y2,z1,z2;
cin >> x1 >> y1 >> z1;
cin >> x2 >> y2 >> z2;
cout << dist(x1,0,y1,0,z1,0) << endl; 
cout << dist(x2,0,y2,0,z2,0) << endl; 
cout << dist(x1,x2,y1,y2,z1,z2) << endl; 
return 0;
}