File content as of revision 0:9ae49accf711:

#include "mbed.h"
#include "Serial.h"
Serial uart1(USBTX,USBRX);
using namespace std;

struct Point
{
    int val;
    double x, y;
    double distance;
    
};

bool comparison(Point a, Point b)
{
    return (a.distance < b.distance);
}

int classifyAPoint(Point arr[], int n, int k, Point p)
{
    for (int i = 0; i < n; i++)
        arr[i].distance =
            sqrt ((arr[i].x - p.x) * (arr[i].x - p.x) + 
                  (arr[i].y - p.y) * (arr[i].y - p.y));
                  
    //sort (arr, arr+n, comparison);
    
    int freq1 = 0;
    int freq2 = 0;
    for (int i = 0; i < k; i++)
    {
        if (arr[i].val == 0)
            freq1++;
        else if (arr[i].val == 1)
            freq2++;
    }
    
    return (freq1 > freq2 ? 0 : 1);
}

int main ()
{
    uart1.baud(9600);
    int n = 17; // Number of data points
    Point arr[n];
 
    arr[0].x = 1;
    arr[0].y = 12;
    arr[0].val = 0;
 
    arr[1].x = 2;
    arr[1].y = 5;
    arr[1].val = 0;
 
    arr[2].x = 5;
    arr[2].y = 3;
    arr[2].val = 1;
 
    arr[3].x = 3;
    arr[3].y = 2;
    arr[3].val = 1;
 
    arr[4].x = 3;
    arr[4].y = 6;
    arr[4].val = 0;
 
    arr[5].x = 1.5;
    arr[5].y = 9;
    arr[5].val = 1;
 
    arr[6].x = 7;
    arr[6].y = 2;
    arr[6].val = 1;
 
    arr[7].x = 6;
    arr[7].y = 1;
    arr[7].val = 1;
 
    arr[8].x = 3.8;
    arr[8].y = 3;
    arr[8].val = 1;
 
    arr[9].x = 3;
    arr[9].y = 10;
    arr[9].val = 0;
 
    arr[10].x = 5.6;
    arr[10].y = 4;
    arr[10].val = 1;
 
    arr[11].x = 4;
    arr[11].y = 2;
    arr[11].val = 1;
 
    arr[12].x = 3.5;
    arr[12].y = 8;
    arr[12].val = 0;
 
    arr[13].x = 2;
    arr[13].y = 11;
    arr[13].val = 0;
 
    arr[14].x = 2;
    arr[14].y = 5;
    arr[14].val = 1;
 
    arr[15].x = 2;
    arr[15].y = 9;
    arr[15].val = 0;
 
    arr[16].x = 1;
    arr[16].y = 7;
    arr[16].val = 0;
 
    /*Testing Point*/
    Point p;
    p.x = 2.5;
    p.y = 7;
    
    // Parameter to decide groupr of the testing point
    while(1)
    {
        wait(0.1);
        int k = 3;
        uart1.printf ("The value classified to unknown point"
            " is %d.\n", classifyAPoint(arr, n, k, p));
        //return 0;
    }

}