Validating user input

The rules may be implemented through the automated facilities of a data dictionary, or by the inclusion of explicit application program validation logic.Data validation is intended to provide certain well-defined guarantees for fitness, accuracy, and consistency for any of various kinds of user input into an application or automated system.I am currently writing a basic Calculator that can add, subtract, multiply and divide two numbers and have that core element working correctly.My "one step further" in this case was to make the program repeating with the option to exit via user input and to prevent any errors due to invalid user inputs.In some situations, such as validating custom controls or supporting legacy browsers, additional scripting may be necessary to validate user input.

Rules can be collected through the requirements capture exercise.

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Challenges include topics such as statistical analysis, searching directories for images, and accessing peripheral devices.

Also, the attribute can be added to form controls, to programmatically indicate that they are required.

Most current web browsers support this attribute and will communicate missing required input to the user, using standard web browser dialog mechanisms.

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