You can use Array to Spreadsheet String.vi regardless of the type of data to manage, since the vi accepts both integers and floating point arrays as an input.
And regardless the type of input, the output string format depends on the format string wired to the vi (that is: you can output a string representing floating point numbers by using "%f" format string event if the input array is made of integers, and you can output a string of integers by using "%d" format string even if the input array is made of doubles: they will be rounded to integers).
Roberto