In the software designer exam, how is the Hemming check code calculated? 5

Detailed explanation of the principle of Hemming check code.

The sequence ab1c001d101 is listed first

a=3@5@7@9@11 (@表示异或, digits) = 0b=3@6@7@10@11=1

c=5@6@7=1

d=9@10@11=0

So the Hemming code is: 01110010101

-.- Students, you can turn to page 25 of "Principles of Computer Composition", if you can understand it, I won't say much about the rest.

The difficulty of the software designer exam is not too great, but there are quite a lot of knowledge points, which belongs to the type of broad but not deep. You'll need to have knowledge of programming languages, databases, software engineering, data flow diagrams, data structures, and more. If you want to take the software designer exam, you can sign up for a Xisai online tutorial class, which is easier to pass the exam.

The passing standard for each subject of each level and major in the computer technology and software professional and technical qualification (level) examination is 45 points (the full score of each subject paper is 75 points).

That is to say, you have to reach 45 points in each subject, and you don't count if you don't reach one of them!

I really don't know how to calculate it, and everyone has to dig deeper. Hehe.

All personnel who abide by the Constitution of the People's Republic of China and various laws, abide by professional ethics, and have a certain ability to apply computer technology can register for the examination of the corresponding professional category and level according to their own conditions. Therefore, there are no restrictions on academic qualifications and qualifications, age and major, etc., and candidates can choose the appropriate level and appropriate qualifications according to their own technical level, but only one qualification is allowed to apply for an examination. The written test is scheduled for one day.

How to register: Applicants can register online. Applicants log in to the official website of local registration and click on the candidate registration entrance to register online.

After online registration, log in to the candidate's email address and wait for the registration review result; If it does not pass the review, log in and modify the relevant content or upload it again**, and continue to wait for the registration review information. Candidates who have passed the registration review should go to the registration point announced by the Provincial Soft Examination Office to go through the procedures for confirming the payment of the fee. Bianchang confirms that the payment time, and the specific arrangements are subject to the official website of the registration in various places.

Applicants who do not have Internet access can register directly at the registration point. When registering, you must fill in the "National Computer Technology and Software Professional and Technical Qualification (Level) Dust Shooting Examination Registration Form" on the computer, upload your electronic **, and pay the examination fee.

For the details of the exam, you can go to the official website of your provincial and municipal soft examination office to check the current enrollment brochure, of course, Xisai will also announce the registration time and cost of each province in Xisai soft examination college for the first time, you can pay attention to Xisai soft examination college.

Hemming code is error correction code. Use the formula m+k+1 2 k (m is the number of information bits, k is the number of error correction bits).

For example, if there is an 8-bit information bit, then the minimum value of k should be 4, so the 8-bit information code needs a 4-bit Hemming error correction code!

In fact, there is no rule to start from left or right, it depends on how you look at the coding sequence, but the general habit is to read from left to right (ps: I have also seen the reverse encoding), of course, the detection bit can only be at 1, 2, 4, 8, 16....These bits, just set them to 1.