[討論]大叔的程式

[acho (十全的只有大補湯)]

# include <stdio.h>
# include <stdlib.h>

# define MAX_NAME_LEN   80

typedef struct scores   scores;

struct scores   {
        int             id;
        char    name[MAX_NAME_LEN];
        int             calc;
        int             com_prog;
        int             total;
        int             rank;
};

int input_scores(struct scores *, int);
int calc_scores(struct scores *, int);
int dump_scores(struct scores *, int);
void dump_score(struct scores *, int);

int main()
{
        int             total, i;
        scores  *scores;

                puts("總共有幾個人?");

                if (scanf("%d", &total) < 1)
                        exit(1);
                else if ((scores = (struct scores *)malloc(sizeof (struct scores) * total)) == NULL)
                        exit(1);

                putchar('\n');

                input_scores(scores, total);
                calc_scores(scores, total);
                dump_scores(scores, total);

                putchar('\n');

                do      {
                        printf("查詢 ID? (1 <= X <= %d; X == -1 結束)\n", total);
                        scanf("%d", &i);
                        i--;
                        if (i >= 0 && i < total)
                                dump_score(scores, i);
                } while (i >= 0);

        return 0;
}

int input_scores(struct scores *scores, int total)
{
        int     i;

                for (i = 0; i < total; i++)     {
                        scores[i].id = i + 1;
                        printf("ID: %d\n", i + 1);
                        puts("Name?");
                        scanf("%s", scores[i].name);
                        puts("Score of Calculus/Computer Program?");
                        scanf("%d%d", &scores[i].calc, &scores[i].com_prog);
                        putchar('\n');
                }

        return i;
}

int cmp_scores(const void *score1, const void *score2)
{
        return (*(const struct scores **)score1)->total < (*(const struct scores **)score2)->total;
}

int calc_scores(struct scores *scores, int total)
{
        int                             i;
        struct scores   **tmp;

                if ((tmp = (struct scores **)malloc(sizeof (struct scores *) * total)) == NULL)
                        exit(1);

                for (i = 0; i < total; i++)     {
                        scores[i].total = scores[i].calc + scores[i].com_prog;
                        tmp[i] = &scores[i];
                }

                qsort(tmp, total, sizeof (scores), cmp_scores);

                for (i = 0; i < total; i++)
                        tmp[i]->rank = i + 1;

                free(tmp);

        return i;
}

void dump_score(struct scores *scores, int i)
{
        printf("[%d] %s\t%d\t%d\t%d\t%d\n",
                scores[i].id, scores[i].name,
                scores[i].calc, scores[i].com_prog,
                scores[i].total, scores[i].rank);
}

int dump_scores(struct scores *scores, int total)
{
        int     i;

                for (i = 0; i < total; i++)
                        dump_score(scores, i);

        return i;
}

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