Limit the number of characters in user input | C++

I have a 5-cell array. I define it this way:

char array[5];

That's how I get from the user:

cin.getline(array, 6);

The problem is that if the user types a string of 6 characters or more, there is a memory leak and the program gets stuck.

Is there a way to limit and make sure that if the user types less than five characters or more than five characters, he will receive an error message?

Thank you