create own file extension name

Hi all, how can i create a file with my own extension filename? for examples:

i have a string variables word, Word='Matlab'

when i combine it with my own extension (let say .001) i want to get something like this, Word.001 (it will show: Matlab.001)

how can i do that?what function that can i use? thanks.

Answer 1

[Amir Hamzah UTeM]

found it..i can use sprintf function.

W='Matlab'

s=sprintf('%s.001',W)