#include <stdio.h>
#include <stdlib.h>
 
// ฟังก์ชันการบวก
void add(float a, float b) {
    printf("ผลลัพธ์: %.2f + %.2f = %.2f\n", a, b, a + b);
}
 
// ฟังก์ชันการลบ
void subtract(float a, float b) {
    printf("ผลลัพธ์: %.2f - %.2f = %.2f\n", a, b, a - b);
}
 
// ฟังก์ชันการคูณ
void multiply(float a, float b) {
    printf("ผลลัพธ์: %.2f * %.2f = %.2f\n", a, b, a * b);
}
 
// ฟังก์ชันการหาร
void divide(float a, float b) {
    if (b != 0)
        printf("ผลลัพธ์: %.2f / %.2f = %.2f\n", a, b, a / b);
    else
        printf("ไม่สามารถหารด้วยศูนย์ได้\n");
}
 
// ฟังก์ชันแสดงเมนู
void showMenu() {
    printf("\nเมนู:\n");
    printf("1. บวก\n");
    printf("2. ลบ\n");
    printf("3. คูณ\n");
    printf("4. หาร\n");
    printf("อื่นๆ เพื่อออกจากโปรแกรม\n");
}
 
// ฟังก์ชันหลัก
int main() {
    int choice;
    float num1, num2;
 
    do {
        system("cls"); // เคลียร์หน้าจอ
        showMenu();
 
        printf("เลือกเมนู: ");
        scanf("%d", &choice);
 
        if (choice >= 1 && choice <= 4) {
            printf("ป้อนตัวเลขที่ 1: ");
            scanf("%f", &num1);
            printf("ป้อนตัวเลขที่ 2: ");
            scanf("%f", &num2);
 
            switch (choice) {
                case 1:
                    add(num1, num2);
                    break;
                case 2:
                    subtract(num1, num2);
                    break;
                case 3:
                    multiply(num1, num2);
                    break;
                case 4:
                    divide(num1, num2);
                    break;
            }
        } else {
            printf("ออกจากโปรแกรม...\n");
        }
 
        printf("\nกดปุ่มใดๆ เพื่อดำเนินการต่อ...");
        getchar(); // จับการกดปุ่มใดๆ
        getchar(); // รอให้ผู้ใช้กดปุ่ม
 
    } while (choice >= 1 && choice <= 4);
 
    return 0;
}

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