I&#x27;m not sure what&#x27;s so difficult to understand about calling a function like parseInteger(userEnteredNumber, defaultLocale) on user input and then calling something like formatInteger(numberToBeOutputted, defaultLocate) on numbers that will be shown to the users. Programming languages already have a fixed representation for decimal numbers that will be used regardless of the user locale which is generally always with a dot for the decimal seperator and often there are no thousand seperators.