C++ Two dimensional array

#include <fstream>
#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
    int V[10][10];
    int V2[10][10];
    int K[10][10];
    void Ilg (int i);
using namespace std;

int main () {
    ifstream fd("Duomenys.txt");
    ofstream fr("Rezultatai.txt", ios::app);

    int i = 1, n = 1;
    char a[256];
    string temp;
    while (!fd.eof()){
        fd >> V[i][1] >> V[i][2] >> V[i][3] >> V[i][4];
        Kord(i);
        //cout << V[i][1] << V[i][2] << V[i][3] << V[i][4] << endl;
        i++;
    }
    Ilg(i);
    return 0;
}

void Kord(int i) {
    ifstream fd("Duomenys.txt");
    ofstream fr("Rezultatai.txt", ios::app);
    //cout << "labas";
    for (int j = 1; j <= i; j++) {
    // iekau x1 y1
    V2[j][1] = V[j][3];
    V2[j][2] = V[j][2];
    // ieskau x3 y3
    V2[j][3] = V[j][1];
    V2[j][4] = V[j][4];
    cout << "X1 Y1 - " << V2[j][1] << " "  << V2[j][2] << endl;
    cout << "X2 Y2 - " << V[j][1] << " " << V[j][2] << endl;
    cout << "X3 Y3 - " << V2[j][3] << " " << V2[j][4] << endl;
    cout << "X4 Y4 - " << V[j][3] << " " << V2[j][4] << endl;
    Ilg(i);
    fr << j << " Trikampio kooridinates" << endl;
    fr << "X1 Y1 - " << V2[j][1] << " "  << V2[j][2] << endl;
    fr << "X2 Y2 - " << V[j][1] << " " << V[j][2] << endl;
    fr << "X3 Y3 - " << V2[j][3] << " " << V2[j][4] << endl;
    fr << "X4 Y4 - " << V[j][3] << " " << V2[j][4] << endl;
    }
}
    void Ilg(int i) {
    ofstream fr("Rezultatai.txt", ios::app);
        for (int j = 1; j < i; j++) {
        K[j][1] = sqrt(pow((double)V[j][1]-(double)V2[j][1],2) + (pow((double)V[j][2] - (double)V2[j][2],2)));
        K[j][2] = sqrt(pow((double)V[j][3]-(double)V2[j][1],2) + (pow((double)V[j][4] - (double)V2[j][2],2)));
        cout << j << " trikampio krastiniu ilgiai " << K[j][1] << " " << K[j][1] <<  endl;
        fr << j << " trikampio krastiniu ilgiai" << endl;
        fr << K[j][1] << " " << K[j][2] << endl;
        fr << "perimetras = " << K[j][1]*2 + K[j][2]*2;
        }
        fr.close();
    }