为什么vs2015运行提示读取字符串的字符时出错，而devcpp正常运行？

[zjda42]

程序如下：（vs中字符串输入已改为_s 版本的）

/* 打印一个月的日程安排*/

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

#define MAX_REMIND 50
#define MSG_LEN 60

using std::cout;
using std::cin;
using std::endl;

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

int main()
{
	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) {
			cout << "--No space left--" << endl;
			break;
		}

		printf("Enter day and reminder:");
		cin >> day;
		if (day == 0)
			break;
		sprintf_s(day_str,100, "%2d", day);
		read_line(msg_str, MSG_LEN);

		for (i = 0; i < num_remind; i++)
			if (strcmp(day_str, reminders[i]) < 0) //reminders[i]提示读取出错
				break;
		for (j = num_remind; j > i; j--)
			reminders[j] = reminders[j - 1];

		reminders[i] = (char*)malloc(2 + strlen(msg_str) + 1);
		if (reminders[i] == NULL) {
			cout << "--No space left--" << endl;
			break;
		}

		strcpy_s(reminders[i], 100, day_str);
		strcat_s(reminders[i], 100, msg_str);

		num_remind++;
	}

	cout << endl << "Day Reminder" << endl;
	for (i = 0; i < num_remind; i++)
		cout << " " << reminders[i] << endl;

	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;
}

[企鹅爱吃方便面]

加上预编译头文件应该就不会在编译的时候报错了

#include <stdafx.h>

另外，这段程序无论在哪儿跑，可能会出现运行时发生冲突，那是指针的问题。