#include <stdio.h>
 
void calculateElectricityBill() {
    float units, totalBill;
 
    printf("\nกรุณากรอกจำนวนหน่วยไฟฟ้าที่ใช้ (kWh): ");
    scanf("%f", &units);
 
    // ตัวอย่างการคำนวณค่าไฟฟ้า (อัตราค่าบริการสมมติ)
    if (units <= 50) {
        totalBill = units * 3.50;  // อัตราค่าไฟ 3.50 บาทต่อหน่วย
    } else if (units <= 150) {
        totalBill = (50 * 3.50) + ((units - 50) * 4.00);
    } else {
        totalBill = (50 * 3.50) + (100 * 4.00) + ((units - 150) * 4.50);
    }
 
    printf("ค่าไฟฟ้าของคุณคือ: %.2f บาท\n", totalBill);
}
 
int main() {
    int choice;
 
    do {
        // แสดงเมนู
        printf("\n==== โปรแกรมคำนวณค่าไฟฟ้า ====\n");
        printf("1. คำนวณค่าไฟฟ้า\n");
        printf("2. ออกจากโปรแกรม\n");
        printf("เลือกเมนู: ");
        scanf("%d", &choice);
 
        // ตรวจสอบตัวเลือกของผู้ใช้
        switch (choice) {
            case 1:
                calculateElectricityBill();
                break;
            case 2:
                printf("ออกจากโปรแกรม...\n");
                break;
            default:
                printf("กรุณาเลือกเมนูที่ถูกต้อง!\n");
        }
 
    } while (choice != 2); // ทำซ้ำจนกว่าผู้ใช้เลือกเมนู 2
 
    return 0;
}
 

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