Rewrite the above description using the structured approach described in this chapter. Resolve the identified ambiguities in an appropriate way. An automated ticket-issuing system sells rail tickets. Users select their destination and input a credit card and a personal identification number. The rail ticket is issued and them credit card account charged. When the user presses the start button, a menu display of potential destinations are activated, along with a message to the user to select a destination. Once a destination has been selected, users are requested to input their credit card. Its validity is checked and the user is then requested to input a personal identifier. When the credit transaction has been validated; the ticket is issued.
3. Rewrite the above description using the structured approach described in this chapter.
Resolve the identified ambiguities in an appropriate way.
An automated ticket-issuing system sells rail tickets. Users select their destination and
input a credit card and a personal identification number. The rail ticket is issued and them
credit card account charged. When the user presses the start button, a menu display of
potential destinations are activated, along with a message to the user to select a destination.
Once a destination has been selected, users are requested to input their credit card. Its
validity is checked and the user is then requested to input a personal identifier. When the
credit transaction has been validated; the ticket is issued.
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