Preventing All Abnormal Terminations

Protection against Most Conditions
Protection against All Conditions
Including Multiple Statements
Determining the Cause of the Error
Using TRY as an Expression
Providing Alternate Sets of Error Handling Code
Optimizing Performance
Triggering Program Dumps

ALGOL and NEWP programs can use the TRY statement to protect processes against abnormal terminations.

Before the implementation of the TRY statement, the best-known method of protection was the ON statement in ALGOL and NEWP. The ON statement is discussed under Protecting a Process from Faults later in this section. Compared to the ON statement, the TRY statement provides the following advantages:

  • Protection against a broader range of otherwise fatal conditions.

  • Alternate sets of error handling code to be executed if the error handling code itself incurs an error.

  • Faster execution.

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