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Ada was one the first programming languages to implement exceptions. Ada was designed primarily to write software for so-called embedded systems, such as software that controls an aircraft or spacecraft. In such systems, an error message like "System Error-Please Reboot" is unacceptable. Graceful recovery from error conditions in such systems is critical.
Here are a few questions to consider about exceptions:
• How did programs written in languages that did not have exception syntax handle error conditions?
• Why is exception handling better?
• What is mean by exception propagation?
• What happens if an exception is thrown but never caught?

Here are a few questions to consider about interfaces:
• How is an interface different from a class?
• What is required when a class implements an interface?
• Can a class implement more than one interface?
• Can an interface contain instance data

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Here are a few questions to consider about exceptions:
• How did programs written in languages that did not have exception syntax handle error conditions?
o They use if else statement
• Why is exception handling better?
o Exception handling separates error-handling code from normal programming tasks, thus making programs easier to read and modify....
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