#include <stdio.h>
#include <string.h>
 
#define STUDENT_COUNT 5
 
// โครงสร้างนักเรียน
typedef struct {
    char name[100];
    int age;
 
    int physicsScore;
    int mathScore;
    float physicsGPA;
    float mathGPA;
} Student;
 
// ฟังก์ชันให้เกรด GPA แบบไทย
float calculateThaiGPA(int score) {
    if (score >= 80) return 4.0;
    else if (score >= 75) return 3.5;
    else if (score >= 70) return 3.0;
    else if (score >= 65) return 2.5;
    else if (score >= 60) return 2.0;
    else if (score >= 55) return 1.5;
    else if (score >= 50) return 1.0;
    else return 0.0;
}
 
// ฟังก์ชันตรวจสอบคะแนน
int isValidScore(int score) {
    return (score >= 0 && score <= 100);
}
 
int main() {
    Student students[STUDENT_COUNT];
 
    for (int i = 0; i < STUDENT_COUNT; i++) {
        printf("กรอกข้อมูลนักเรียนคนที่ %d\n", i + 1);
 
        printf("ชื่อ: ");
        getchar(); // รับ newline ค้าง
        fgets(students[i].name, sizeof(students[i].name), stdin);
        students[i].name[strcspn(students[i].name, "\n")] = 0; // ลบ newline
 
        printf("อายุ: ");
        scanf("%d", &students[i].age);
 
        // รับคะแนนฟิสิกส์
        do {
            printf("คะแนนรวมฟิสิกส์ (เต็ม 100): ");
            scanf("%d", &students[i].physicsScore);
 
            if (!isValidScore(students[i].physicsScore)) {
                printf("❌ คะแนนไม่ถูกต้อง ต้องอยู่ระหว่าง 0 ถึง 100\n");
            }
 
        } while (!isValidScore(students[i].physicsScore));
 
        // รับคะแนนคณิตศาสตร์
        do {
            printf("คะแนนรวมคณิตศาสตร์ (เต็ม 100): ");
            scanf("%d", &students[i].mathScore);
 
            if (!isValidScore(students[i].mathScore)) {
                printf("❌ คะแนนไม่ถูกต้อง ต้องอยู่ระหว่าง 0 ถึง 100\n");
            }
 
        } while (!isValidScore(students[i].mathScore));
 
        // คำนวณเกรด
        students[i].physicsGPA = calculateThaiGPA(students[i].physicsScore);
        students[i].mathGPA = calculateThaiGPA(students[i].mathScore);
 
        printf("\n");
    }
 
    // แสดงผล
    printf("\n📚 รายงานผลนักเรียนทั้งหมด:\n");
    for (int i = 0; i < STUDENT_COUNT; i++) {
        printf("\nนักเรียนคนที่ %d\n", i + 1);
        printf("ชื่อ: %s\n", students[i].name);
        printf("อายุ: %d ปี\n", students[i].age);
        printf("คะแนนฟิสิกส์: %d | เกรด: %.1f\n", students[i].physicsScore, students[i].physicsGPA);
        printf("คะแนนคณิตศาสตร์: %d | เกรด: %.1f\n", students[i].mathScore, students[i].mathGPA);
        printf("----------------------------------\n");
    }
 
    return 0;
}
 

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