Help... C++ beginner code

Question

I want to the output to show "Invalid Choice!" ... but when I enter "6" nothing happens ...
Here is the code:
cout << "You have chosen the Roman Number programing chalenge." << endl;
cout << "Enter a number between 1 and 5:";
int number;
cin >> number;
switch (number)
{
case 4: cout << "The roman numerial version of 4 is: IV" << endl;
break;
case 1: cout << "The roman numerial version of 1 is: I" << endl;
break;
case 2: cout << "The roman numerial version of 2 is: II" << endl;
break;
case 3: cout << "The roman numerial version of 3 is: III" << endl;
break;
case 5: cout << "The roman numertial version of 5 is: V" << endl;
break;
if (number > 5) {
cout << "Invalid Choice!" << endl;

Answer 1

put this as the last case of your switch
default:
cout << "Invalid Choice!" << endl;
break;