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

int flip_coin(void)
{
	return (rand() %2)?0:1;
}

int flip_coin(void);
int main(void)
{
	srand(time(NULL));
	int result[100];
	for (int i=0; i<100; i++)
	{
		result[i]=flip_coin();
	}

	int tails=0,heads=0;
	for (int i=0; i<100; i++)
	{
		if (result[i]==1)
			tails++;
		else
			heads++;
	}
	fprintf(stderr, "Heads: %d (%.2f\%)\n Tails: %d (%.2f\%)\n", heads, (double)heads,tails,(double)tails);

	return 0;

}