// cs148.cpp
// 
// CS148 2004 Support Code
// This file implements utility code for CS148 like the getTime() function.
//

#include "cs148.h"
#include <time.h>


// Uninitialized random numbers
int CS148::bRandInit = 0;

// Get the global time with at least millisecond resolution.
double CS148::getTime(void) {
#ifdef WIN32
  struct _timeb tbuf;
  _ftime(&tbuf);
  return ((double)tbuf.time + 0.001 * (double)(tbuf.millitm)); 
#else
  struct timeval time;
  gettimeofday(&time, NULL);
  return ((double)time.tv_sec + 0.000001 * (double)time.tv_usec); 
#endif
}


// Specify seed for random number generator
void CS148::RandSeed(int s) {
  srand((unsigned)s);
}


// Get random number between 0 and n - 1 (inclusive)
int CS148::RandInt(int n) {
  if (!bRandInit) {
    srand((unsigned)time(NULL));
    bRandInit = 1;
  }

  // For large numbers (> 10K) this will get less random
  return rand() % n;
}


// Get floating point random numbers between 0.0 and 1.0
double CS148::RandDouble(void) {
  if (!bRandInit) {
    srand((unsigned)time(NULL));
    bRandInit = 1;
  }

  return (double)rand() / (double)RAND_MAX; 
}