#include <iostream>
#include <stdlib.h>
#include <time.h>

int main()
{
	int seed;

	cout << "Enter seed: ";
	cin >> seed;
	
	// if user enters -1, seed with time of day
	if (seed == -1)
		seed = time(0);

	srand(seed);
	// generate a random number between 0 and 99
	for (int i=0;i<10;++i)
		cout << rand()%100 << endl;
	
	// generate a random number between 0 and 1
	int count = 0;
	for (int i=0;i<1000;++i)
		count += rand()%2;
	cout << "the count is " << count << endl;

	// generate a biased coin flip with 75% head, 25% tail
	for (int i=0;i<10;++i)
	{
		if (rand()%4 < 3)
			cout << "head\n";
		else
			cout << "tail\n";
    }
	cout << "----\n";
	// generate a biased coin flip with 42% head, 58% tail
	int head_ct = 0, tail_ct = 0;
	for (int i=0;i<100;++i)
	{
		if (rand()%100 < 42)
			++head_ct;
		else
			++tail_ct;
    }
	cout << head_ct << " heads, " << tail_ct << " tails\n";

	// generate floating random numbers 0 to slightly less than 1
	for (int i=0;i<100;++i)
		cout << rand()/32768. << endl;

	// pick randomly from A, B, or C with probabilities .6, .3 and .1
	// The range 0-.6 will be for A, .6-.9 for B, and .9-1.0 for C.
	double r;
	for (int i=0;i<100;++i)
	{
		r = rand()/32768.;
		if (r < .6)
			cout << "A" << endl;
		else if (r < .9)
			cout << "B" << endl;
		else
			cout << "C" << endl;
	}
	// Note:  for the elevator assignment, you will have 9 (0-8) floors
	// and you will have to generate a floor choice from a distribution
	// over these 9 floors.  You can do it with a bunch of if/else if/else
	// statements, but there's a more efficient way with a loop and having
	// the probabilities in an array.  Think about it.  One clue:
	// the first if statement can be written as "if (r < 0.+.6)"
	// and the last else statement can be written as "else if (r < .9+.1)"
	

}