creating a for loop with a mixture of strings and numbers as outputs

I want to create a for loop that will have the following output:

"trial1.csv" on its first run, "trial2.csv" on its second run, "trial3.csv" on its third run......etc. What is the most efficient way of doing that?

trial1 = sprintf ('max%d', k) which gives me the trialk piece but I was not able to add the .csv piece. It gave me an error every time I tried adding it in different ways. I found a work around but needed 3 lines of code instead of 1. It works but doesn't seem to efficient.

I am still learning matlab so I am sure its a simple problem

Thanks in advance!

[Mostafa]

Why was my question deleted? I can accept that I did something wrong but at least tell me what I did?