#include <time.h>                // for time()
#include <stdlib.h>              // for rand/srand
#include "rando.h"

int RandGen::ourInitialized = 0;

RandGen::RandGen()
// postcondition: system srand() used to initialize seed
//                once per program
{
    if (0 == ourInitialized)
    {
        ourInitialized = 1;      // only call srand once
        srand(unsigned(time(0)));       // randomize
    }
}

int RandGen::RandInt(int max)
// precondition: max > 0
// postcondition: returns int in [0..max)
{
    return int(RandReal() * max);
}

int RandGen::RandInt(int low, int max)
// precondition: low <= max
// postcondition: returns int in [low..max]
{
    return low + RandInt(max-low+1);
}

double RandGen::RandReal()
// postcondition: returns double in [0..1)
{
    return rand() / (double(RAND_MAX) + 1);
}


double RandGen::RandReal(double low,double max)
// postcondition: returns double in [low..max)
{
	double zeroToOne=rand() / (double(RAND_MAX) + 1);
    return (max-low)*zeroToOne+low;
}