#include <iostream>
#include <fstream>
#include <sstream>
#include <cmath>

#define FILENAME "lab2.txt"

using namespace std;
int main(void)
{
    double s_Distance = 1000000;
    int closest = 0;
    //Declare and initialize variables.
    double unknown[5], known[5];
    double distance(double hand_1[5],double hand_2[5]);
    int count=1;
    cout << "Please enter 5 measurments to compare fingers" << endl;

    for (int i = 0; i < 5; i++)
        cin >> unknown[i];

    ifstream lab;
    lab.open(FILENAME);

    if (lab.fail())
        cout << "Error opening input file." << endl;
    else
    {
        while (!lab.eof())
        {
            for(int i = 0; i < 5; i++)
                lab >> known[i];

            cout << "Known set " << count << ": ";

            for (int i = 0; i < 5; i++)
                cout << known[i] << " ";

            cout << endl;

            if (s_Distance > distance(unknown,known))
            {
                s_Distance = distance(unknown,known);
                closest = count;
            }

            // Compute and print distance.
            cout << "Distance : " << distance(unknown,known) << endl << endl;
            count++;
        }
    }

    cout << "Shortest Distance : " << s_Distance << endl << endl;
    cout << "Known " << closest << " has best match" << endl << endl;
    // Exit program.
    return 0;
}
//-----------------------------------------------------------------
//  This function computes the distance between two hand measurements.
double distance(double hand_1[5],double hand_2[5])
{
    //  Declare variables.
    int k;
    double sum=0;
    //  Compute sum of absolute value differences.
    for (k=0; k<=4; k++)
    sum = sum + fabs(hand_1[k]-hand_2[k]);
    //  Return distance value.
    return sum;
}