passing array of structure through function

[cash]

I'm supposed to write a function that finds the maximum distance between two points created by an array. I'm confused about how to make a function that can pass an array of a structure and find the distance between point x and y?

#include <iostream>
#include <iomanip>
#include <cmath>
#include <ctime>
#include <cstdlib>
using namespace std;
struct Point {
    double x, y;
};


double getDistance(struct Point a, struct Point b);


double random(unsigned long int & seed);
int main()
{
    unsigned long int seed;
    srand(time(NULL));
    seed = rand();
    const int SIZE=50;
    Point array[50];

    for(int i=0; i<SIZE; i++)
    {
        array[i].x = -5+(10*random(seed));
        array[i].y = -5+(10*random(seed));
   
        
        cout << array[i].x << endl;;
        cout << array[i].y << endl;
        
    }
    
    cout <<" Max Distance between a and b: %lf\n"<< endl ;
    
    
    return 0;
}
double random(unsigned long int & seed)
{
    const int MODULUS = 15749;
    const int MULTIPLIER = 69069;
    const int INCREMENT = 1;
    seed = ((MULTIPLIER*seed)+INCREMENT)%MODULUS;
    return double (seed)/MODULUS;
    
}
double getDistance(struct Point array ) // help needed
{
    double distance;
    
    return distance;
}

[Ganado]

Pass it like this:

double getDistance(Point array[], int size) // help needed
{
    for (int i = 0; i < size; i++)
    {
        for (int j = 0; j < size; j++)
        {
            double dx = array[i].x - array[j].x;
            double dy = array[i].y - array[j].y;
            // etc.
            double distance = std::sqrt(dx * dx + dy * dy);
        }
    }
    return 0.0; // todo
}

call it like this:
double distance = getDistance(array, SIZE);

cash wrote:

maximum distance between two points created by an array.

If that's the case, then "getDistance" is an ambiguous choice for a function name.
I would prefer something like "getMaxDistance".

[H00G0]

Your function prototype:
double getDistance(struct Point a, struct Point b);

double getDistance(struct Point array ) // help needed
{
    double distance;
    
    return distance;

Doesn't match your function definition in terms of the arguments passed to the function

[dhayden]

A minor improvement to Ganado's excellent suggestion. To avoid checking each pair of points twice, change line 5 to:
for (int j = i+1; j < size; j++)