Log in with password and exit with error for three times.

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <windows.h>
#include <string.h>


int main()
{
    int mm[20] = { 0 };
	int i = 0;
	
	for (int i = 0; i < 3; i++)
	{   
		printf(" Please input a password ：");
		scanf("%s", mm);
		if (strcmp(mm, "123456") == 0)
		{
			printf(" Landing successful ！！");
			break ;
		}
		else
		{
			printf(" Wrong password , Please re-enter \n");
		}
	}

	if (i == 3)
	{
		printf(" Three mistakes , Log out .");
	};
	
    return 0;
}