Can't seem to get this to work. The idea is to calculate the percentage of heads and tails after each count, accumulating after each iteration. Except I keep getting nan% for my calculations. Anybody see what I'm doing wrong?

void flipCoin(time_t seconds, int flipCount){
    vector<int> flips;
    float headCount = 0;
    float tailCount = 0;
    double headProbability = double((headCount/(headCount + tailCount))*100);
    double tailProbability = double((tailCount/(headCount + tailCount))*100);

    for (int i=0; i < flipCount; i++) {
        int flip = rand() % (HEADS - TAILS + 1) + TAILS;
        flips.push_back(flip);
        if (flips[i] == 1) {
            tailCount++;
            cout << "Tail Percent: " << tailProbability << "%" << endl;
        }else{
            headCount++;
            cout << "Head Percent: " << headProbability << "%" << endl;
        }
    }
}