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Chapter 13 Exception Handling

Chapter 13 Exception Handling. Motivations. When a program runs into a runtime error, the program terminates abnormally. How can you handle the runtime error so that the program can continue to run or terminate gracefully? This is the subject we will introduce in this chapter. Examples.

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Exceptions

Exceptions. Three categories of errors: Syntax errors Runtime errors Logic errors Syntax errors: rules of the language have not been followed. Runtime error: program is running and environment detects an operation that is impossible to carry out.

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Lexical Analyzer

Lexical Analyzer. The main task of the lexical analyzer is to read the input source program, scanning the characters, and produce a sequence of tokens that the parser can use for syntactic analysis. The interface may be to be called by the parser to produce one token at a time

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