I am trying to do a circular queue where the user would input an integer( size of the queue) then generate the queue, then we can enqueue or dequeue

I am trying to do a circular queue where the user would input an integer( size of the queue) then generate the queue, then we can enqueue or dequeue. I'm done with most of the code, but i sill have some logic errors: 1- the head and tail pointers never seem to overlap. 2- I get an error when i try to overflow the the queue. i want to just get an error message without breaking the whole code. 3- if possible i want to add an option to enforce the type of input within the queue depending on the first value inside the queue, so if the first enqueued value is an int then all the rest should be integers as well. thank you.