#include <stdio.h>
#include <math.h>
#include <stdlib.h>
 
void menu() {
    printf("\n===== เครื่องคิดเลขขั้นสูง =====\n");
    printf("1. บวก (+)\n");
    printf("2. ลบ (-)\n");
    printf("3. คูณ (*)\n");
    printf("4. หาร (/)\n");
    printf("5. ยกกำลัง (pow)\n");
    printf("6. รากที่สอง (sqrt)\n");
    printf("7. sin\n");
    printf("8. cos\n");
    printf("9. tan\n");
    printf("10. log (ฐาน 10)\n");
    printf("0. ออกจากโปรแกรม\n");
    printf("============================\n");
}
 
int main() {
    int choice;
    double num1, num2, result;
 
    do {
        menu();
        printf("เลือกเมนู: ");
        scanf("%d", &choice);
 
        switch(choice) {
            case 1:
                printf("ป้อนสองตัวเลข: ");
                scanf("%lf %lf", &num1, &num2);
                result = num1 + num2;
                printf("ผลลัพธ์: %.2lf\n", result);
                break;
            case 2:
                printf("ป้อนสองตัวเลข: ");
                scanf("%lf %lf", &num1, &num2);
                result = num1 - num2;
                printf("ผลลัพธ์: %.2lf\n", result);
                break;
            case 3:
                printf("ป้อนสองตัวเลข: ");
                scanf("%lf %lf", &num1, &num2);
                result = num1 * num2;
                printf("ผลลัพธ์: %.2lf\n", result);
                break;
            case 4:
                printf("ป้อนสองตัวเลข: ");
                scanf("%lf %lf", &num1, &num2);
                if (num2 != 0)
                    result = num1 / num2;
                else {
                    printf("ข้อผิดพลาด: หารด้วยศูนย์ไม่ได้!\n");
                    continue;
                }
                printf("ผลลัพธ์: %.2lf\n", result);
                break;
            case 5:
                printf("ป้อนฐานและเลขชี้กำลัง: ");
                scanf("%lf %lf", &num1, &num2);
                result = pow(num1, num2);
                printf("ผลลัพธ์: %.2lf\n", result);
                break;
            case 6:
                printf("ป้อนตัวเลข: ");
                scanf("%lf", &num1);
                if (num1 >= 0)
                    result = sqrt(num1);
                else {
                    printf("ข้อผิดพลาด: ไม่สามารถหารากที่สองของค่าลบได้!\n");
                    continue;
                }
                printf("ผลลัพธ์: %.2lf\n", result);
                break;
            case 7:
                printf("ป้อนมุม (องศา): ");
                scanf("%lf", &num1);
                result = sin(num1 * M_PI / 180);
                printf("ผลลัพธ์: %.2lf\n", result);
                break;
            case 8:
                printf("ป้อนมุม (องศา): ");
                scanf("%lf", &num1);
                result = cos(num1 * M_PI / 180);
                printf("ผลลัพธ์: %.2lf\n", result);
                break;
            case 9:
                printf("ป้อนมุม (องศา): ");
                scanf("%lf", &num1);
                result = tan(num1 * M_PI / 180);
                printf("ผลลัพธ์: %.2lf\n", result);
                break;
            case 10:
                printf("ป้อนตัวเลข: ");
                scanf("%lf", &num1);
                if (num1 > 0)
                    result = log10(num1);
                else {
                    printf("ข้อผิดพลาด: ไม่สามารถคำนวณ log ของค่าที่น้อยกว่าหรือเท่ากับ 0 ได้!\n");
                    continue;
                }
                printf("ผลลัพธ์: %.2lf\n", result);
                break;
            case 0:
                printf("ออกจากโปรแกรม...\n");
                break;
            default:
                printf("ตัวเลือกไม่ถูกต้อง!\n");
        }
    } while (choice != 0);
 
    return 0;
}
 

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