// Random number generator class (implementation independent)
//
// CONSTRUCTION: with no intializer (uses seed based on time)
//
// ***********************PUBLIC OPERATIONS******************************
//   int RandInt()                  --> Return int in range [0..RAND_MAX)
//   int RandInt(int high)          --> Return int in range [0..high)
//   int RandInt(int low, int high) --> Return int in range [low..high]
//   float RandReal()               --> Return float in range [0..1)
/////////////////////////////////////////////////////////////////////////

#ifndef _RANDGEN_H
#define _RANDGEN_H

#include <cstdlib>         // FOR rand, srand, RAND_MAX
#include <ctime>           // FOR time()
using namespace std;

class RandGen {
  public:
    RandGen::RandGen()
    // constructor -- initializes the generator based on the current time
    {
    static int initialized = 0;
    if (initialized == 0){
        initialized = 1;           // ONLY CALL SRAND ONCE
        srand(int(time(0)));       // RANDOMIZE
    }
    }

    int RandGen::RandomInt(int high = RAND_MAX)
    // Assumes: high >= 0 (if no input specified, uses maximum integer as default)
    // Returns: pseudo-random integer in range 0..high-1
    {
    return rand() % high;
    }

    int RandGen::RandomInt(int low, int high)
    // Assumes: low <= high
    // Returns: pseudo-random integer in range low..high
   {
    return low + RandomInt(high-low+1);
    }

    double RandGen::RandomReal()
    // Returns: pseudo-random real in range [0..1)
    {
    return RandomInt() / double(RAND_MAX);
    }
};

#endif