// Lab1.0.cpp : Этот файл содержит функцию "main". Здесь начинается и заканчивается выполнение программы.
//

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

using namespace std;

void Task1(float *mass, int size, int i);
void Task2(float *mass, int size, int i);
void Task3(float *mass, int size, int i);
void Task4(float *mass, int size, int i);
void Task5(float *mass, int size, int i);
void Task6(float *mass, int size, int i);
void Task7(float *mass, int size, int i);
void Task8(float *mass, int size, int i);
void Task9(float *mass, int size, int i);
void Task10(float *mass, int size, int i);

float *mass;

int main()
{
    int  size, i, ch;
    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 task 1-10 : "; cin >> ch;
    switch (ch) {
    case 1: Task1(mass, size, i); break;
    case 2: Task2(mass, size, i); break;
    case 3: Task3(mass, size, i); break;
    case 4: Task4(mass, size, i); break;
    case 5: Task5(mass, size, i); break;
    case 6: Task6(mass, size, i); break;
    case 7: Task7(mass, size, i); break;
    case 8: Task8(mass, size, i); break;
    case 9: Task9(mass, size, i); break;
    case 10: Task10(mass, size, i); break;
    default: cout << "error"; break;
    }
    delete[]mass;
    return 0;
}

void Task1(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 Task2(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 Task3(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 Task4(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 Task5(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 Task6(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 Task7(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 Task8(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 Task9(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 Task10(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;
}