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function foobar { .@first_argument$ = getarg(0); // get the value of the first argument passed to foobar() .@output$ = "Hello " + .@first_argument$; // add the value of the first argument to "Hello" return .@output$; // exit the function, while returning the value of .@output$ } mes(foobar("world")); // Hello World

.@num$ = .@num % (10 ** (.@i + 1)) / (10 ** .@i) + .@num$; // x = (y mod (10 ** (z + 1)) / (10 ** z)) // x = y mod 10 // this means it can be simplified to: .@num$ = (.@num % 10) + .@num$; but I believe your original script had an error because it uses both .@num and .@num$