#include <stdio.h>
 
int main() {
 
    // ===============================
    // ข้อมูลร้าน
    // ===============================
    char shopName[] = "ร้านอิ่มจุก อร่อยเว่อร์";
 
    // ===============================
    // ตัวแปรเมนู
    // ===============================
    int menu;
    int select;
    int qty;
    int i;
 
    // ===============================
    // ข้อมูลสินค้า
    // ===============================
    char food[6][30] = {
        "ข้าวผัด",
        "ผัดกะเพรา",
        "ต้มยำ",
        "สเต็ก",
        "น้ำอัดลม",
        "น้ำเปล่า"
    };
 
    float price[6] = {50, 60, 80, 120, 25, 15};
    int order[6] = {0, 0, 0, 0, 0, 0};
 
    // ===============================
    // ตัวแปรคำนวณเงิน
    // ===============================
    float total = 0;
    float discount = 0;
    float vat = 0;
    float net = 0;
    float pay = 0;
    float change = 0;
 
    // ===============================
    // เมนูหลัก
    // ===============================
    do {
        printf("\n====================================\n");
        printf("   %s\n", shopName);
        printf("====================================\n");
        printf("1. แสดงรายการอาหาร\n");
        printf("2. สั่งซื้ออาหาร\n");
        printf("3. ชำระเงิน / ใบเสร็จ\n");
        printf("4. ออกจากระบบ\n");
        printf("เลือกเมนู: ");
        scanf("%d", &menu);
 
        switch (menu) {
 
        // -------------------------------
        // แสดงรายการอาหาร
        // -------------------------------
        case 1:
            printf("\n----- รายการอาหาร -----\n");
            for (i = 0; i < 6; i++) {
                printf("%d. %-10s ราคา %.2f บาท\n",
                       i + 1, food[i], price[i]);
            }
            break;
 
        // -------------------------------
        // สั่งซื้ออาหาร
        // -------------------------------
        case 2:
            do {
                printf("\nเลือกหมายเลขอาหาร (1-6): ");
                scanf("%d", &select);
 
                if (select >= 1 && select <= 6) {
                    printf("จำนวนที่ต้องการ: ");
                    scanf("%d", &qty);
                    order[select - 1] += qty;
                    printf("เพิ่ม %s จำนวน %d รายการ\n",
                           food[select - 1], qty);
                } else {
                    printf("เลือกเมนูไม่ถูกต้อง\n");
                }
 
                printf("ต้องการสั่งเพิ่มหรือไม่ (1=ใช่ / 0=ไม่): ");
                scanf("%d", &menu);
 
            } while (menu == 1);
            break;
 
        // -------------------------------
        // ชำระเงิน + ใบเสร็จ
        // -------------------------------
        case 3:
            total = 0;
            printf("\n========== ใบเสร็จ ==========\n");
            printf("%s\n", shopName);
            printf("------------------------------\n");
 
            for (i = 0; i < 6; i++) {
                if (order[i] > 0) {
                    float sum = order[i] * price[i];
                    printf("%s x %d = %.2f บาท\n",
                           food[i], order[i], sum);
                    total += sum;
                }
            }
 
            printf("------------------------------\n");
            printf("ราคารวม: %.2f บาท\n", total);
 
            if (total >= 600) {
                discount = total * 0.10;
                printf("ส่วนลด 10%%: -%.2f บาท\n", discount);
            } else {
                discount = 0;
                printf("ส่วนลด: 0.00 บาท\n");
            }
 
            vat = (total - discount) * 0.07;
            printf("VAT 7%%: %.2f บาท\n", vat);
 
            net = total - discount + vat;
            printf("ยอดสุทธิ: %.2f บาท\n", net);
 
            printf("รับเงินมา: ");
            scanf("%f", &pay);
 
            if (pay >= net) {
                change = pay - net;
                printf("เงินทอน: %.2f บาท\n", change);
            } else {
                printf("เงินไม่พอ กรุณาชำระใหม่\n");
            }
 
            printf("==============================\n");
            printf("ขอบคุณที่ใช้บริการ\n");
            break;
 
        // -------------------------------
        // ออกจากระบบ
        // -------------------------------
        case 4:
            printf("ออกจากระบบเรียบร้อย\n");
            break;
 
        default:
            printf("กรุณาเลือกเมนูให้ถูกต้อง\n");
        }
 
    } while (menu != 4);
 
    return 0;
}

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