How to get a big string into the other line for visibility

I have a big string which i would like to store it in a command but due to visibility issue i want to use ... command to come to next line.Could you please tell me how to do itt

For Example

My string is AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

I want to code something like

a='AAAAAAAAAAAAAAAAAAAAAAAAAAAAA...

AAAAAAAA'

But this gives an error message

Please note i dont want to use

a= ['AAAAAAAAAAAAAAAAAAAAAAAAAAAAA'...

'AAAAAAAAAAAA']; this command it gives the correct ans but it hamper with \n command if am using with fprintf

[Stephen23]

"...but it hamper with \n command if am using with fprintf "

What does that mean exactly? Please show an example of what you tried.