LW5 intervals resort better

#include <iostream>
#include <iomanip>
#include <time.h>
#include <cmath>

using namespace std;
int main()
{

	int n, a, b, c;

	cout << "Enter the size of the array: " << endl;
	cin >> n;
	float* arr = new float[n];
	cout << "select and enter the number: 1-manual entry, 2-automatic input " << endl;
	cin >> a;

	if (a == 1) {
		cout << "Entry the element of array: " << endl;


		for (int i = 0; i < n; i++)
		{
			cin >> arr[i];
		}
		cout << endl << "Manual input array: " << endl;
		for (int i = 0; i < n; i++)
		{
			cout << " " << arr[i] << endl;
		}

	}
	else if (a == 2) {
		cout << endl << "Automatic input array: " << endl;
		srand(time(0));

		for (int i = 0; i < n; i++)
		{
			float random = ((float)rand() / RAND_MAX) * rand() - rand();
			arr[i] = random;
			cout << " " << arr[i] << endl;
		}
	}
	else {
		cout << "Try again" << endl;
		return 0;
	}


	cout << endl << "Enter the begining of interval: ";
	cin >> b;
	cout << "Enter the ending of interval: ";
	cin >> c;
	cout << endl << "Numbers in the interval:" << endl;
	int count = 0;
	for (int i = 0; i < n; i++)
	{
		if (arr[i] >= b && arr[i] <= c) {
			cout << arr[i] << "; ";
			count++;
		}
	}
	cout << endl << "Count:" << count << endl;

	float sum = 0;
	float max = arr[0];
	int arrNumber = 0;
	for (int i = 1; i < n; i++)
	{
		if (max < arr[i]) max = arr[i];
		arrNumber = i;
	}

	for (int i = arrNumber + 1; i < n; i++)
	{
			sum += arr[i];
	}
	cout << endl << "Max element in array: " << max << endl << "Amount:" << sum << endl;


	float perem;
	cout << endl << endl << "Numbers in descending order: " << endl;

	for (int i = 0; i < n; i++)
	{
		for (int j = i + 1; j < n; j++)
		{
			if (fabs(arr[i]) < fabs(arr[j]))
			{
				perem = arr[i];
				arr[i] = arr[j];
				arr[j] = perem;
			}
		}
	}

	for (int i = 0; i < n; i++)
	{
		cout << arr[i] << "  ";
	}

	cout << endl << endl;

	return 0;
}