Problem: Write a Lex program for Decimal to Hexadecimal conversion.
Lex reads an input stream specifying the lexical analyzer and outputs source code implementing the lexer in the C programming language. The function yylex() is the main flex function which runs the Rule Section.
Prerequisite: Flex (Fast lexical Analyzer Generator)
Input: 12 Output: C Input: 116 Output: 74 Input: 55 Output: 37 Input: 212 Output: D4
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