Update Lexer.flex and generate Lexer.java that returns tokens for mini$-$C compiler to Parser.java. You can print comments, white spaces, and new lines on the console in Lexer.java; Update Parser.java that prints tokens returned by Lexer on the console in a form explained in the next page; You can add extra java programs if you need them. During the lexical analyzing process, your lexer should handle the compiler directive properly: your lexer should replace all lexemes defined by #define into their corresponding other lexemes and then should return their corresponding tokens Followings list a part $($or modified$)$ of keywords and symbols of the mini$-$C language, which will be used in this project:

keywords: "print", "func", "var", "void", "bool", "int", "float", "struct", "size",

"new", $"$if$",$ "else", "while", "return", "break", "continue", "true", "false",

"begin", "end", "addr", "value", "then"

symbols: $"(",")","[","]","$;$",",",".","$:$=","$::$"$

operator keywords$/$symbols: $"+","-","*","/",$ "and", $"$or$",$ "not"

relative$-$operator symbols: $"=","<>","<",">","<=",">="$

The followings describe patterns of integer, real number, identifier, comment, newline, and whitespace:

int $->$ positive integers.

float $->$ positive real numbers except for integers, which have fractional parts but not exponential parts.

$->$ It can be $12\mathrm{.}3,2\mathrm{.}0,00\mathrm{.}000,$ etc., but not $10.$ or $\mathrm{.}10$ or $1\mathrm{.}10$E$1.$

identifier $->$ C language identifier. It can start with a lowercase letter or a capital letter but not with $\_.$

comment $->"//".*,$ a string that starts with $//$ and ends at the end of line

block comment $->"/*[^]*"*/",$ a string including newlines that starts with $/*$ and ends with $*/.$

newline $->$

whitespace $->[\backslash$t$\backslash$r$]+$

Output:

$<>$

$<>$

$<>$

$//*$ hello

$/*+4$ ;

c :$=$ a $+$ b; $//$ hello

d :$=$ b $*/$

$<>$

Success!