installment - float error C2296

Question

I have this function:

    float ObliczRate(float fKwotaKredytu, float fOprocentowanie, int iIloscRat)
{
    /*
    Rata = K * y^n * (y-1) / (y^n-1);

    y = 1 + (r / 12)
    */

    float fRata, float fY;

    fY = 1 + (fOprocentowanie / 12); // obliczanie stałej kredytu
    fRata = fKwotaKredytu * fY^iIloscRat * (fY - 1) / (fY^iIloscRat - 1); // obliczanie raty stałej ze wzoru

    return fRata;
}

And i have error: "error C2296: '^' : illegal, left operand has type 'float'" only on "(fY^iIloscRat - 1)". What's wrong with this?

Answer 1

It's because ^ is not an exponential operator, but the bitwise XOR operator. You want the std::pow function.

Answer 2

In C++ the operator ^ has a meaning of bitwise XOR operator not the power operation. You will have to use the pow function defined in the cmath header here.