Plz help me with this flex program

Question

0.00/5 (No votes)

See more:

Hello every body could you plz Help me with this flex program because I am no familiar with flex environment the question is:

"You have to make a flex file, this file should be used to generate a lexical scanner that will match the following patterns:
DOUBLE:
It's a string of characters without any gaps, it consists of three parts:
1. Integer part: It's a string of digits (at least one digit). It mustn’t begin with 0 except if the value of the string equal to zero so it has to consist of only one digit (0). Optionally the string can be preceded by (+) or (-) sign.
2. Fractional part: this part is optional; it begins with (.), then a string of digits (at least one digit).
3. Exponential part: this part is also optional, it begins with (e) or (E) then (+) or (-) to define the sign of the exponential, then a string of digits (at least one digit), this string mustn’t begin with (0) or equal to (0).
 .54E4, 94.E34, 09.45E3, 00.43E5, 4.53E, 24.4E, 34.3E0, 34.3E09 are not DOUBLE.
 2.43E9, 34E-9, 0E+24, -24.4, +90.000e+34 are DOUBLE."

plz help.

Posted 5-Nov-12 0:10am

elfuego81

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

OriginalGriff · Answer 1 · 2012-11-05T00:14:00

Solution 1

We do not do your homework: it is set for a reason. It is there so that you think about what you have been told, and try to understand it. It is also there so that your tutor can identify areas where you are weak, and focus more attention on remedial action.

Try it yourself, you may find it is not as difficult as you think!

Posted 5-Nov-12 0:14am

OriginalGriff

Comments

elfuego81 5-Nov-12 6:21am

I know it's not difficult but it's a one day homework and it's not the only question it has many questions I only need help with one so I do the others.

elfuego81 5-Nov-12 6:23am

I did some programs by now on flex but there is some syntax i didn't understand like yylex() and yywrap() what they used for??