#include <iostream>
using namespace std;
int main(int argc, char* argv[])
{
    float a1, a2, b1, b2, x, y;
    if(argc>4) {
        a1 = (float)atof(argv[1]);
        a2 = (float)atof(argv[3]);
        b1 = (float)atof(argv[2]);
        b2 = (float)atof(argv[4]);
        cout << endl << "Prvi pravac: y = " << a1 << "*x + " << b1 << endl;
        cout << endl << "Drugi pravac: y = " << a2 << "*x + " << b2 << endl;
    }
    else if(argc==4) {
        a1 = (float)atof(argv[1]);
        a2 = (float)atof(argv[3]);
        b1 = (float)atof(argv[2]);
        cout << "Unesite koeficijent b2: ";
        cin >> b2;
        cout << endl << "Prvi pravac: y = " << a1 << "*x + " << b1 << endl;
        cout << endl << "Drugi pravac: y = " << a2 << "*x + " << b2 << endl;
    }
    else if(argc==3) {
        a1 = (float)atof(argv[1]);
        cout << "Unesite koeficijent a2: ";
        cin >> a2;
        b1 = (float)atof(argv[2]);
        cout << "Unesite koeficijent b2: ";
        cin >> b2;
        cout << endl << "Prvi pravac: y = " << a1 << "*x + " << b1 << endl;
        cout << endl << "Drugi pravac: y = " << a2 << "*x + " << b2 << endl;
    }
    else if(argc==2) {
        a1 = (float)atof(argv[1]);
        cout << "Unesite koeficijent b1: ";
        cin >> b1;
        cout << "Unesite koeficijent a2: ";
        cin >> a2;
        b1 = (float)atof(argv[2]);
        cout << "Unesite koeficijent b2: ";
        cin >> b2;
        cout << endl << "Prvi pravac: y = " << a1 << "*x + " << b1 << endl;
        cout << endl << "Drugi pravac: y = " << a2 << "*x + " << b2 << endl;
    }
    else if (argc == 1) {
        cout << "Unesite koeficijent a1: ";
        cin >> a1;
        cout << "Unesite koeficijent b1: ";
        cin >> b1;
        cout << endl << "Prvi pravac: y = " << a1 << "*x + " << b1 << endl;
        cout << "Unesite koeficijent a2: ";
        cin >> a2;
        cout << "Unesite koeficijent b2: ";
        cin >> b2;
        cout << endl << "Drugi pravac: y = " << a2 << "*x + " << b2 << endl;
    }

    if (a1 == a2)
    {
        cout << "Pravci se ne sijeku ";
        if (b1 == b2)
        {
            cout << " – radi se o istom pravcu!" << endl;
        }
        else
        {
            cout << " – radi se o paralelnim pravcima!" << endl;
        }
    }
    else
    {
        cout << "Pravci se sijeku – koordinate sjedišta:" << endl;;
        x = (b2 - b1) / (a1 - a2);
        y = a1 * x + b1;
        cout << " (x,y) = " << x << "," << y << ")" << endl;
    }
    cin.get();
    return 0;
}