distance between 2 points

t9e11.pointsDistance.cpp

// t9e11.pointsDistance.cpp
// juanfc 2023-11-14
// https://gist.github.com/juanfal/4b55b90e61369616e051b7d41d727be6

#include <iostream>
#include <cmath>
#include <array>
using namespace std;

// consts
const int N=3;

// types
typedef array<float,N> TPos;

// prototypes
void writeArr(TPos a);
float distance(TPos a, TPos b);

int main()
{
    TPos a = {{0, 0, 1}},
         b = {{0, 1, 0}};
    writeArr(a); cout << endl;
    writeArr(b); cout << endl;
    cout << "Distance: "
         << distance(a, b) << endl; // 1
    return 0;
}

void swap(int& a, int& b);

float distance(TPos a, TPos b)
{
    int d = 0;
    for (int i = 0; i < N; ++i)
        d += (b[i]-a[i])*(b[i]-a[i]);
    return sqrt(d);
}

void writeArr(TPos a)
{
    for (int i = 0; i < N; ++i)
        cout << a[i] << " ";
}

void swap(int& a, int& b)
{
    int t = a;
    a = b; b = t;
}