1- Use a While loop around your diagram, and configure your vi properties (right-click on the icon at the right top of the window to set : Show front panel when called (in "Window apparence/customize", and "Run when opened" (in "Execution")
2 - The answer was given in your last post :
use a "Search and Replace String" function (in the String sub-palette) and wire a "," ("search string" input) and a "." ("replace string" input)
Chilly Charly (aka CC)