HW10.1

#include <stdio.h>
#include <conio.h>

#define TIEU_THU 400
#define TIEN_DIEN 750

#define MAXSIZE 40

typedef enum {OFF, ON} STATE;

int GetState (STATE state) {
    switch (state) {
        case ON:
            return 1;
        case OFF:
            return 0;
        default:
        return -1;
    }
}

int SetState (STATE state[], int n, int i, STATE set) {
    if (i >= 1 && i <= n) {
        state[i-1] = set;
        return 0;
    }
    else return -1;
}

int Check (STATE state[], int n, int i) {
    if (i > 0 && i <= n) {
        return GetState(state[i-1]);
    }
    else return -1;
}

int PrintState (STATE state[], int n) {
    int i;
    putchar('\n');
    printf("> Trang thai cua cac may hien tai la:\n");
    for (i = 0; i < n; ++i) {
        printf("%d  ", GetState(state[i]));
        if (i % 4 == 3)
            putchar('\n');
    }
    putchar('\n');
    return 0;
}

int TotalPower (int count[], int n) {
    int i, sum = 0;
    for (i = 0; i < n; ++i) {
        sum += count[i] * TIEU_THU;
    }
    return sum;
}

int PrintPower (int count[], int n) {
    int i;
    putchar('\n');
    printf("> Tong dien nang tieu thu cua tung may tinh den hien tai la:\n");
    for (i = 0; i < n; ++i) {
        printf("%d  ", count[i] * TIEU_THU);
        if (i % 4 == 3)
            putchar('\n');
    }
    putchar('\n');
    return 0;
}

int PrintMaxMin (int count[], int n) {
    int i, u = 0, v = 0, max = count[0], min = count[0];
    int i_max[MAXSIZE] = {0}, i_min[MAXSIZE] = {0};
    i_max[u] = i_min[v] = 0;
    for (i = 1; i < n; ++i) {
        if (max < count[i]) {
            max = count[i];
            u = 0;
            i_max[u] = i;
        } else if (max == count[i]) {
            ++u;
            i_max[u] = i;
        }
        if (min > count[i]) {
            min = count[i];
            v = 0;
            i_min[v] = i;
        } else if (min == count[i]) {
            ++v;
            i_min[v] = i;
        }
    }
    putchar('\n');
    printf("> Cac may duoc su dung nhieu nhat (%d lan su dung):\n", max);
    for (i = 0; i < u; ++i)
        printf("%d, ", i_max[i]+1);
    printf("%d\n", i_max[i]+1);
    printf("> Cac may duoc su dung it nhat (%d lan su dung):\n", min);
    for (i = 0; i < v; ++i)
        printf("%d, ", i_min[i]+1);
    printf("%d\n", i_min[i]+1);
    return 0;
}

int Select () {
    int tmp, select, isInvalid;
    do {
        tmp = scanf("%d", &select);
        while (getchar() != '\n');
        if (tmp != 1 && (select > 40 || select < 1)) {
            printf("!!! Vui long nhap ma may tu 1 den 40 !!!\n");
            isInvalid = 1;
        } else isInvalid = 0;
    } while (isInvalid);
    return select;
}

int main () {
    int choice, i, isOut = 0, tmp, isInvalid, select;
    STATE state[MAXSIZE];
    int count[MAXSIZE] = {0};
    for (i = 0; i < MAXSIZE; ++i)
        state[i] = OFF;
    do {
        printf("\n--------------------------------------------\n");
        printf("1. Chon may\n");
        printf("2. Roi may\n");
        printf("3. In trang thai may\n");
        printf("4. In dien nang tieu thu cac may\n");
        printf("5. In tong dien nang tieu thu\n");
        printf("6. May duoc dung nhieu nhat va it nhat\n");
        printf("0. Thoat\n");
        printf("--------------------------------------------\n");
        printf("> Nhap lua chon: ");
        do {
            tmp = scanf("%d", &choice);
            while (getchar() != '\n');
            if (tmp != 1 || (choice > 6 || choice < 0)) {
                isInvalid = 1;
                printf("!!! Vui long nhap dung lua chon !!!\n");
            } else isInvalid = 0;
        } while (isInvalid);
        switch(choice) {
            case 1:
                do {
                    printf("\n--------------------------------------------\n");
                    printf("> Nhap may can dung: ");
                    select = Select();
                    if (Check(state, MAXSIZE, select)) {
                        printf("!!! May dang duoc su dung. Vui long chon may khac !!!\n");
                    } else {
                        SetState(state, MAXSIZE, select, ON);
                        ++count[select-1];
                        printf(">>> Dang ky may thanh cong !\n");
                    }
                    printf("--------------------------------------------\n");
                } while (!Check(state, MAXSIZE, select));
                break;
            case 2:
                do {
                    printf("\n--------------------------------------------\n");
                    printf("> Nhap may muon roi: ");
                    select = Select();
                    if (!Check(state, MAXSIZE, select)) {
                        printf("!!! May chua duoc su dung. Vui long chon dung may !!!\n");
                        isInvalid = 0;
                    } else {
                        isInvalid = SetState(state, MAXSIZE, select, OFF);
                        printf(">>> Roi may thanh cong !\n");
                    }
                    printf("--------------------------------------------\n");
                } while (isInvalid);
                break;
            case 3:
                PrintState(state, MAXSIZE);
                break;
            case 4:
                PrintPower(count, MAXSIZE);
                break;
            case 5:
                tmp = TotalPower(count, MAXSIZE);
                printf("\n> Tinh den thoi diem hien tai.\n\tTong dien nang tieu thu cua cac may la: %d\n\tTien dien thanh toan la: %d\n", tmp, tmp * TIEN_DIEN);
                break;
            case 6:
                PrintMaxMin(count, MAXSIZE);
                break;
            case 0:
                isOut = 1;
            default:
                printf("!!! Vui long nhap lua chon tu 0 den 6 !!!\n");
        }
    } while (!isOut);
    return 0;
}

// Dung may
// Roi may
// Trang thai may
// Dien nang tieu thu
// Tong dien nang tieu thu
// May duoc dung nhieu nhat, it nhat