17IC Reminder.c

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

#define MAX_REMIND 50   /* maximum number of reminders */
#define MSG_LEN 60      /* max length of reminder message */

int read_line(char str[], int n);

int main(void)
{
    char *reminders[MAX_REMIND];
    char day_str[3], msg_str[MSG_LEN+1];
    int day, i, j, num_remind = 0;

    for (;;)
        {
            if (num_remind == MAX_REMIND)
                {
                    printf("-- No space left --\n");
                    break;
                }

            printf("Enter day and reminder: ");
            scanf("%2d", &day);
            if (day == 0)
                break;
            sprintf(day_str, "%2d", day);
            read_line(msg_str, MSG_LEN);

            for (i = 0; i < num_remind; i++)
                if (strcmp(day_str, reminders[i]) < 0)
                    break;
            for (j = num_remind; j > i; j--)
                reminders[j] = reminders[j-1];

        reminders[i] = malloc(2 + strlen(msg_str) + 1);
        if (reminders[i] == NULL)
        {
            printf("-- No space left --\n");
            break;
        }

        strcpy(reminders[i], day_str);
        strcat(reminders[i], msg_str);

        num_remind++;
        }

        printf("\nDay Reminder\n");
        for (i = 0; i < num_remind; i++)
            printf(" %s\n", reminders[i]);

    return 0;
}

int read_line(char str[], int n)
{
    int ch, i = 0;

    while ((ch = getchar()) != '\n')
        if (i < n)
            str[i++] = ch;
    str[i] = '\0';
    return i;
}