/*
학생 성적 및 등수 출력 with struct
*/
#include <stdio.h>
#include <stdlib.h>
struct Student
{
    int *scores;
    int avg;
};
void getAverage(struct Student *arr, int numStu, int numSubj);
void printRank(struct Student *arr, int numStu, int numSubj);

int main(int argc, char **argv)
{
    if (argc != 3)
    {
        printf("Usage : [학생 수] [과목 수]\n");
        return 1;
    }
    struct Student *stus;

    int i, j, input, sum = 0;

    int subject = atoi(argv[2]);
    int students = atoi(argv[1]);
    /* int maxscore = 100;
    int subject = 5;
    int students = 5; */

    printf("학생 수: %d // 과목 수: %d\n", students, subject - 1);

    stus = (Student *)malloc(sizeof(Student) * students);
    for (i = 0; i < students; ++i)
    {
        (&stus[i])->scores = (int *)malloc(sizeof(int) * subject);
    }
    for (i = 0; i < students; ++i)
    {
        printf("학생 %d 의 점수 ------------\n", i + 1);
        for (j = 0; j < subject; ++j)
        {
            struct Student *A;
            A = &stus[i];
            printf("과목 %d 점수 입력 : ", j + 1);
            scanf("%d", &input);
            A->scores[j] = input;
        }
    }
    getAverage(stus, students, subject);
    printRank(stus, students, subject);

    for (i = 0; i < students; i++)
    {
        free((&stus[i])->scores);
    }
    free(stus);

    return 1;
}

void getAverage(struct Student *arr, int numStu, int numSubj)
{
    int i, j, sum, avg;
    for (i = 0; i < numStu; ++i)
    {
        sum = 0;
        for (j = 0; j < numSubj; ++j)
        {
            sum += (&arr[i])->scores[j];
        }
        (&arr[i])->avg = sum / numSubj;
        printf("학생 %d의 평균 점수 : %d\n", i + 1, (&arr[i])->avg);
    }
}

void printRank(struct Student *arr, int numStu, int numSubj)
{
    int i, j, rank;
    for (i = 0; i < numStu; ++i)
    {
        rank = 1;
        for (j = 0; j < numStu; ++j)
        {
            if ((&arr[i])->avg < (&arr[j])->avg)
                rank++;
        }
        printf("학생 %d의 등수 : %d\n", i + 1, rank);
    }
}