#include <ctime> /* time */
#include <stdlib.h>/* memory */
#include <random>
#include <malloc.h>
#include <stdio.h>
#include <math.h>


int fill(int(*m))
{
	int i;
	srand((unsigned int)time(NULL));
	for (i = 0; i <= 49; i++)
	{
		m[i] = rand() % 81 - 50;
		printf("%d ", m[i]);
	}

	return 0;
}

float average(int(*m)) /* arithmetic mean */
{
	int i;
	float d;
	int a = 0, n = 0;
	for (i = 0; i <= 49; i++)
	{
		if (m[i] >= 0)
		{
			a += m[i];
			n += 1;
		}
	}
	if (n == 0)
	{
		for (i = 0; i <= 49; i++)
		{
			printf("%d ", m[i]);
		}
	}
	d = float(a) / float(n);
	return d;
}

int substitution(int(*m), int(d))
{
	int i;
	for (i = 0; i <= 49; i++)
	{
		if (m[i] < 0)
		{
			m[i] = d;
		}
		printf("%d ", m[i]);
	}
	return 0;
}

int main()
{
	int* massiv;
	float d;
	massiv = (int*)malloc(50 * sizeof(int));
	fill(massiv);
	printf("\n");
	d = average(massiv);
	substitution(massiv, int(d));
	printf("\n %0.2f \n", d); /* округляет к меньшему*/
	free(massiv);
	system("pause");
	return 0;
}