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  1. How to differentiate between Lexical, semantic and syntax error from a given code snippet.
  2. Why is this lexical error and not syntax error? 
    $ y = 0x5i; $
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This number is start with 0 and we know octal no is start with 0 and (0 to 7 numbers are only allowed here) but here x,i written that's why it shown error in Lexical phase. It's not indentifying as Token.
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