Character String and Variables

Is there a way to call variables inside of a character string? What I would like to do is below:

Take the character string BOO and attached the numbers 1-30 based on a for loop so I get the following in character format

BOO1 BOO2 BOO3 ... BOO30

Where BOO is nothing but a string of characters.

Answer 1

[the cyclist]

sprintf('BOO%d ',d)

Answer 2

[Coulton]

I was able to hard code my way to get this to work, but I like the sprintf() better. I was looking at that function, but I guess I didn't understand it fully. Thanks for the help!