lamer.cpp

#include <iostream>
#include <math.h>
#include <iomanip> 

using namespace std;

/** wyznacznik arraya */
float fckd(float jpdl[2][2]) {
    return jpdl[0][0] * jpdl[1][1] - jpdl[0][1] * jpdl[1][0];
}
int main() {
    cout 
        << "Uklad rownan: " << endl
        << "ax + by = e" << endl
        << "cx + dy = f" << endl;
        
    float a = 3, b = -2, e = 2, c = -1, d = 4, f = 1;
    cout << "Podaj a: "; cin >> a;
    cout << "Podaj b: "; cin >> b;
    cout << "Podaj e: "; cin >> e;
    
    cout << "Podaj c: "; cin >> c;
    cout << "Podaj d: "; cin >> d;
    cout << "Podaj f: "; cin >> f;
    cout << "Fantastycznie! Oto wynik:" << endl;
    
    /**
     *
     * A = [ a b ]
     *     [ c d ]
     *     
     * X = [ x ]
     *     [ y ]
     * 
     * B = [ e ]
     *     [ f ]
     * 
     * x = (detAx / detA) 
     * y = (detAy / detA)
     */
    float A[2][2] = {
        { a, b },
        { c, d }
    };
    float B[2] = {
        e, 
        f
    };
    float Ax[2][2] = {
        { B[0], A[0][1] },
        { B[1], A[1][1] }
    };
    float Ay[2][2] = {
        { A[0][0], B[0] },
        { A[1][0], B[1] }
    };
    
    /** Wspollczynniki */
    float detA = fckd(A)
        , detAx = fckd(Ax)
        , detAy = fckd(Ay);
    
    if(detA) {
        cout 
            << "x = " << detAx / detA << endl
            << "y = " << detAy / detA << endl;
    } else {
        if(!detAx && !detAy) cout << "Uklad ma nieskonczenie wiele rozwiazan" << endl;
        else cout << "Sprzeczny" << endl;
    } 
    return 1;
}