How day_str can be greater than reminders[i] when reminders[i] contains a message with date and day_str is some date. The code is from C-The modern apporach
#include <stdio.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("-- 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--)
strcpy(reminders[j], reminders[j-1]);
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;
}
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