3+2*(126+4)=

I am Hamad Fawad                 

a

A

3.654e5

2/9*1=

2*+3=

pippo

%%

%standalone

%class Calc

nl =  \n|\r|\r\n

intNumber =  [1-9][0-9]*

scientificNo    =   [-+]?[0-9]*\..?+([eE])[-+-]?[0-9]+)?

Alphabets       =   [a-zA-Z]

Words =   [a-zA-Z][a-zA-Z0-9]*

%%

{intNumber} {System.out.println("NUMBER: " +yytext());}

{scientificNo} {System.out.println("SNumber: " +yytext());}

{Alphabets} {System.out.println("Alphabets: " +yytext());}

{Words} {System.out.println("Words: " +yytext());}

"+" {System.out.println("PLUS");}

"-" {System.out.println("MINUS");}

"*" {System.out.println("STAR");}

"/" {System.out.println("DIV");}

"(" {System.out.println("OPEN_BRACKET");}

")" {System.out.println("CLOSE_BRACKET");}

"=" {System.out.println("EQUAL\n");}

"p"    {System.out.println("Chracter";}

{nl}|" "|\t {;}

. {System.out.println("Error: " + yytext());}