显示一个月的提醒日期

#include "stdafx.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAX_REMIND 50
#define MSG_LEN 60
int read_line(char str[],int n);
int main(void)
{
    char reminders[MAX_REMIND][MSG_LEN+3];
    char day_str[3],msg_str[MSG_LEN+1];
    int day,i,j,num_remind =0;

    for(;;)
    {
        if(num_remind == MAX_REMIND)
        {   
            printf_s("-- NO space left--
");
            break;
        }
        printf_s("Enter day and reminder:");
        scanf_s("%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--)
            strcpy_s(reminders[j],reminders[j-1]);
        strcpy_s(reminders[i],day_str);
        strcat_s(reminders[i],msg_str);
        num_remind++;
    }
    printf_s("
Day Reminder
");
    for(i = 0;i < num_remind;i++)
    {
        printf_s("%s
",reminders[i]);
    }
    system("pause");
    return 0;
}
int read_line(char str[],int n)
{
    int ch , i = 0;
    while((ch = getchar() != '
'))
    {
        if(i < n)
        {
            str[i++] = ch;
        }
    }
 str[i] = '';
 return i;
}