Compiler Design

Please help me with this lexical analysis In C

Using FInite automata and a driver.

With file test scanner , main, scanner, token.h

• All case sensitive
• Each scanner error should display "Scanner Error:" followed by details including the line number ff available
• Alphabet
• all English letters (upper and lower), digits, plus the extra characters as seen below, plus WS
• No other characters allowed and they should generate errors
• Identifiers
• begin with a lower case letter and
• continue with any number of letters or underscores
• you may assume no identifier is longer than 8 characters
• Keywords (reserved, suggested individual tokens)

• start stop loop void var return scan out program if then let

• Operators and delimiters group.

• = < > : + - * / % . ( ) , { } ; [ ]

• Integers
• any sequence of decimal digits, no sign, no decimal point
• you may assume no number longer than 8 characters
• Comments start with $ and end with $