#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
#include <limits.h>

int coinFlip (int times);

int
main (int argc, char *argv[])
{
	int nflag = 0, times = 1, i, tails, heads;
	float ph, pt;
	argc--;

	for (i = 1; i <= argc; i++) {
		if (strcmp(argv[i], "-n") == 0) {
			nflag++;
		} else if (strcmp(argv[i], "-m") == 0) {
			times = INT_MAX;
			break;
		} else if (nflag == 1) {
			times = atoi(argv[i]);
			if (times == 0) {
				printf("Non Integer Value Inputted\n");
				return -1;
			}
			break;
		}
	}

	if (times == 1)
		printf("%s\n", coinFlip(times) ? "Heads" : "Tails");
	else {
		tails = coinFlip(times);
		heads = times - tails;
		ph = (float)heads/times;
		pt = (float)tails/times;

		printf("Heads: %d\nTails: %d\nProb Heads: %f\nProb Tails: %f\n", heads, tails, ph, pt);
	}

	return 0;
}

/* coinFlip: Flips a coin n numbers of times and returns the number of tails */
int 
coinFlip (int times)
{
	int tails, i, c;
	time_t t;
	srand((unsigned) time(&t));

	for (i = tails = 0; i < times; i++) {
		c = rand() % 2;
		if (c == 1)
			tails++;
	}

	return tails;
}