#include <stdio.h>
 
// ฟังก์ชันสำหรับการคำนวณ
float add(float x, float y) {
    return x + y;
}
 
float subtract(float x, float y) {
    return x - y;
}
 
float multiply(float x, float y) {
    return x * y;
}
 
float divide(float x, float y) {
    if (y != 0) {
        return x / y;
    } else {
        printf("ไม่สามารถหารด้วยศูนย์ได้!\n");
        return 0;
    }
}
 
int main() {
    int choice;
    float num1, num2;
 
    // แสดงเมนูให้เลือก
    printf("เลือกการคำนวณ:\n");
    printf("1. บวก (+)\n");
    printf("2. ลบ (-)\n");
    printf("3. คูณ (*)\n");
    printf("4. หาร (/)\n");
    printf("กรุณาเลือกการคำนวณ (1/2/3/4): ");
    scanf("%d", &choice);
 
    // รับค่าตัวเลขจากผู้ใช้
    printf("กรุณาใส่ตัวเลขตัวแรก: ");
    scanf("%f", &num1);
    printf("กรุณาใส่ตัวเลขตัวที่สอง: ");
    scanf("%f", &num2);
 
    // คำนวณตามที่เลือก
    switch(choice) {
        case 1:
            printf("%.2f + %.2f = %.2f\n", num1, num2, add(num1, num2));
            break;
        case 2:
            printf("%.2f - %.2f = %.2f\n", num1, num2, subtract(num1, num2));
            break;
        case 3:
            printf("%.2f * %.2f = %.2f\n", num1, num2, multiply(num1, num2));
            break;
        case 4:
            printf("%.2f / %.2f = %.2f\n", num1, num2, divide(num1, num2));
            break;
        default:
            printf("การเลือกไม่ถูกต้อง\n");
            break;
    }
 
    return 0;
}
 

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