/// num_separator(value, separator, digits)
// num_separator(12345678, "_", 3); // Result: 12_345_678
var value = string(round(argument0));
var sep = argument1;
var digits = argument2 - 1;
var res = "";
var cnt = 0;
for (var i=string_length(value); i>0; i--)
{
res = string_char_at(value, i) + res;
if cnt++ == digits and i > 1
{
cnt = 0;
res = sep + res;
}
}
return res;