#include<iostream>
#include<ctime>
#include<string>
using namespace std;
void showVector(double *vectorExample, int n,string vectorName)
{
    cout << "Wektor" <<" "<< vectorName << endl;
    for (int i = 0; i < n; i++)
    {
        cout << vectorExample[i] << endl;
    }


}

void setVectorValue(double*vectorExample, int n,string vectorName)
{

    cout << "Wpisz wartosci wektora" <<" "<< vectorName << endl;
    for (int i = 0; i < n; i++)
    {
        cin >> vectorExample[i];


    }

}

double scalarByValue(double*VectorExampleA, double*VectorExampleB, int n) {

    double result=0;

    for (int i = 0; i < n; i++)
    {
        result += (VectorExampleA[i] * VectorExampleB[i]);



    }


    return result;

}

double &scalarByReference(double*VectorExampleA, double*VectorExampleB, int n, double &resultByReference)
{
    for (int i = 0; i < n; i++)
    {
        resultByReference += (VectorExampleA[i] * VectorExampleB[i]);



    }


    return resultByReference;


}

double *scalarByPointer(double*VectorExampleA, double*VectorExampleB, int n, double *resultByPointer)
{
    //double*wsk = resultByPointer; //alternatywne rozwiazanie, mniej optymalne

    for (int i = 0; i < n; i++)
    {
        (*resultByPointer) += (VectorExampleA[i] * VectorExampleB[i]);
        //(*wsk) += (VectorExampleA[i] * VectorExampleB[i]);



    }


    return resultByPointer;

}

double mathExpression(double*VectorExampleA, double*VectorExampleB, int n)

{
    double valA=0, valB=0;
    for (int i = 0; i < n; i++)
    {

        valA += pow(VectorExampleA[i], 2);
        valB+= pow(VectorExampleB[i], 2);


    }

    return ((valA + valB) / (scalarByValue(VectorExampleA, VectorExampleB, n)));



}


int main() {
    double *vectorA,*vectorB,resultByPointer=0,resultByReference=0;
    int n;
    cout << "Podaj liczbe elementow wektora\n";
    cin >> n;
    vectorA = new double[n];
    vectorB = new double[n];
    setVectorValue(vectorA,  n,"A");
    cout << endl;
    setVectorValue(vectorB, n,"B");
    cout << endl;

    showVector(vectorA,n,"A");

    showVector(vectorB,n,"B");
    cout << endl;

    cout << "Iloczyn skalarny(przez wartosc ) wynosi\n";
    cout << scalarByValue(vectorA, vectorB, n)<<endl;

        cout << "Iloczyn skalarny(przez wskaznik) wynosi\n";

    cout << *scalarByPointer(vectorA, vectorB, n, &resultByPointer) << endl;


        cout << "Iloczyn skalarny(przez referencje) wynosi\n";

        cout << scalarByReference(vectorA, vectorB, n, resultByReference) << endl;

        cout << "Wartosc wyrazenia\n";

        cout << mathExpression(vectorA, vectorB, n)<<endl;





    system("pause");
    return 0;
}