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Where do you change choice inside of your while loop?If it's not changed you can't expect to use it in your if block's boolean condition.Forms frequently include required input that needs to be clearly identified using labels.Also, the attribute can be added to form controls, to programmatically indicate that they are required.

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Nevertheless, they are great when it comes to checking a simple set of rules.Implementing a finite state machine is quite straightforward. Note that it adds a few more states than the image above, to also catch the quotes that surround the Strings properly.Finite automata are great tools which you can use in validating structured data.Most current web browsers support this attribute and will communicate missing required input to the user, using standard web browser dialog mechanisms.These dialogs are expected to respect the settings and preferences of the user in the web browser (and operating system), such as default font-size, colors, and language.

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