#include "pch.h"
#include <iostream>
#include <fstream>
#include <cmath>

using namespace std;

void Z1(float *mass, int size, int i);
void Z2(float *mass, int size, int i);
void Z3(float *mass, int size, int i);
void Z4(float *mass, int size, int i);
void Z5(float *mass, int size, int i);
void Z6(float *mass, int size, int i);
void Z7(float *mass, int size, int i);
void Z8(float *mass, int size, int i);
void Z9(float *mass, int size, int i);
void Z10(float *mass, int size, int i);

float *mass;

int main()
{
	int  size, i, key;
	cout << "enter size mass: "; cin >> size;
	mass = new float[size];
	fstream file("random.txt");
	if (!file.is_open()) { cout << "error: no file\n"; return false; }
	for (i = 0; i < size; i++) {
		file >> mass[i];
	}
	file.close();
	cout << "choice 1-10 : "; cin >> key;
	switch (key) {
	case 1: Z1(mass, size, i); break;
	case 2: Z2(mass, size, i); break;
	case 3: Z3(mass, size, i); break;
	case 4: Z4(mass, size, i); break;
	case 5: Z5(mass, size, i); break;
	case 6: Z6(mass, size, i); break;
	case 7: Z7(mass, size, i); break;
	case 8: Z8(mass, size, i); break;
	case 9: Z9(mass, size, i); break;
	case 10: Z10(mass, size, i); break;
	default: cout << "error"; break;
	}
		delete []mass;
	return 0;
}

void Z1(float *mass, int size, int i) {
	int max, min, max_n, min_n;
	max = mass[0]; min = mass[0]; i = 0;
	do {
		if (max < mass[i]) { max = mass[i]; max_n = i; }
		if (min > mass[i]) { min = mass[i]; min_n = i; }
		i++;
	} while (i < size);
	cout << "max[" << max_n << "]=" << max << endl <<
	"min[" << min_n << "]=" << min << endl;
}

void Z2(float *mass, int size, int i) {
	int quantity=0, a, b;
	i = 0;
	cout << "a: "; cin >> a;
	cout << "\nb: "; cin >> b;
	if (b < a) {
		b = b + a;
		a = b - a;
		b = b - a;
	}
	do {
		if (mass[i] >= a && mass[i] <= b) quantity++;
		i++;
	} while (i < size);
	cout << "quantity: " << quantity << endl;
}

void Z3(float *mass, int size, int i) {
	int sum=0, multiplication=1;
	i = 1;
	sum += mass[0];
	do {
		if (i % 2 == 0) { sum += mass[i]; }
		else multiplication *= mass[i];
		i++;
	} while (i < size);
	cout << "sum: " << sum << endl <<
			"multiplication: " << multiplication << endl;
}

void Z4(float *mass, int size, int i) {
	int sum = 0, max=0, max_n=0;
	max = mass[0]; i = 1;

	do {
		if (max <= mass[i]) {
			max = mass[i];
			max_n = i;
		}
		i++;
	} while (i < size);
	max_n++;
	for (; max_n < size; max_n++) {
		sum += mass[max_n];
	}
	cout << "sum: " << sum << endl;
}

void Z5(float *mass, int size, int i) {
	int number, quantity=0;
	i = 0;
	cout << "enter number: "; cin >> number;
	do {
		if (mass[i] == number) quantity++;
		i++;
	} while (i < size);
	cout << "quantity: " << quantity << endl;
}

void Z6(float *mass, int size, int i) {
	int multiplication = 1, max, max_n = 0;
	max = abs (mass[0]);
	for (i = 0; i < size; i++) {
		if (max <= abs(mass[i])) { max=abs(mass[i]); max_n = i;}
	}
	max_n++;
		do {
			multiplication*= mass[max_n];
			max_n++;
		}while(max_n < size);
	cout << "muitiplication: " << multiplication << endl;
}

void Z7(float *mass, int size, int i) {
	int quantity = 0;
	for (i = 0; i < size; i++) {
		if (mass[i] < 0) quantity++;
	}
	cout << "quantity: " << quantity << endl;
}

void Z8(float *mass, int size, int i) {
	int sum = 0, number_nul;
		for (i = 0; i < size; i++) {
			if (mass[i] == 0) number_nul = i;

		}
		for (; number_nul < size; number_nul++) {
			sum += mass[number_nul];
		}
		cout << "sum: " << sum << endl;
}

void Z9(float *mass, int size, int i) {
	int  number_n, sum=0;//y-дробn. х-целая
	double y, x=0;
	i = 0;
	for (; i < size; i++){
		if (mass[i] < 0) {
			number_n = i; x = mass[i];
		}
	}
	number_n++;
	for (; number_n < size; number_n++) {
		y = modf (mass[number_n], &x);
		sum += x;
		x = 0;
	}
	cout << "sum: " << sum << endl;
}

void Z10(float *mass, int size, int i) {
	int sum = 0, max_n=0, max;
	max = mass[0];
	for (i=1; i < size; i++) {
		if (mass[i] >= max) { max = mass[i]; max_n = i; }
	}
	cout << "max: " << max << endl;
	for (i = 0; i < max_n; i++) {
		if (mass[i] > 0) sum += mass[i];
	}
	cout << "sum: " << sum << endl;
}