Currency exchange enhancement?

[wzyboy]

Hi,

when exchanging currencies, it would be better to be able to enter "from" amount and "to" amount manually and let the application calculate the exchange rate for you.

For example, at an airport I exchange 630 CNY into 100 USD. I enter "630" as "from" amount, but after I enter "100" as "to" field, the "from" field will change into some other number like "625.33" (according to the current exchange rate). This makes the curencies inaccruate.

Would it be possible to let users manually enter "from" and "to" amount?