C语言：模拟输入密码系统，三次以内正常通过，三次退出程序

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

int main()
{
int i = 0;
char arr1[] = "123456";
char arr2[20];

printf("please input your password: \n");
for (; i<3; i++)
{
scanf("%s", &arr2);
if (strcmp(arr1, arr2) == 0)
{
printf("portal succeed!\n");
break;
}
else
{
printf("password error,try again!\n");
}
}

if (i == 3)
{
return 0;
}
printf("取钱成功！");
return 0;
}