static const int M = 2147483647;
static const int A = 48271;
static const int Q = M / A;
static const int R = M % A;
class 
{
public:
    explicit (int initialValue = 1);
    int randomInt();
    double random0_1();
    int randomInt(int low, int high);
private:
    int state_;
};
Random::Random(int initialValue)
{
    if(initialValue < 0)
        initialValue += M;
    state_ = initialValue;
    if(state_ == 0)
        state_ = 1;
}
int Random::randomInt()
{
    int tempState = A * (state_ % Q) - R*(state_ / Q);
    if(tempState >= 0)
        state_ = tempState;
    else
        state_ = tempState + M;
    return state_;
}
double Random::random0_1()
{
    return (double)randomInt() / M;
}
int Random::randomInt(int low, int high)
{
    if(low > high)
        return -1;
    return randomInt() % (high - low + 1) + low;
}
int main()
{
    Random r;
    printf("%dn", r.randomInt());
    printf("%fn", r.random0_1());
    printf("%dn", r.randomInt(3, 10));
    return 0;
}