c++ - C format specifier question -

-

When I was working I came across a code that was written by someone else. I see a statement, 

  sprintf (o_prem-> o_file_name, "% s_% s_% 04.4d_% s_% s.ASC", "OUTD", "RM", sequence_no, datestamp_book 1, timestamp_buff 1);

In the above statement, I see % 04.4d . Is this a perfect format specifier?

variable sequence_no is constant int and does not have a decimal in it.

to <3> printf

An optional precision, after a period, an optional number string after it, if the numeric string is omitted, then it is taken as the exact zero. Returns the minimum number of digits appearing for D, I, O, U, X and X conversion , after the decimal point for the number of digits, A, A, E , F and F conversion, the maximum number of significant digits for live and live conversions, or the maximum number of characters from the string of conversions is printed.

In this situation, % 04.4d , .4 specifies that all four digits of the number should be printed. Of course, the 04 part is less than 1000 only, if the number pad with leading zero. However, in this case, in the form of the above manual page,

`0 '(zero) for all conversions except zero padding N, the changed value is padded on the left, instead of zero With zero If a precise numerical conversion is given with (D, I, O, U, I, X and X), then 0 flag is ignored .

As surely all four digits will be printed, my guess is that it is only surviving or typo or something that is composed of this syntax GCC-VAL generates compiler warnings (see Sinan Unur's example), but this is not a real error.


Comments

Post a Comment

Popular posts from this blog

MySql variables and php -

-
I am getting an error with php in order to format mysql_query () in php to format this string What is the right way? SELECT SELECT SELECT (*) Agents @AgentCount; User_Agent_English, User_Angent_Oursal, US.___Gent_Aginal, COUNT (User_Agent_Percade) ACC, COUNT (*) / (AgentCount) Percentage by agents user_agent_preser order DEC limit limit 50; In PHP, how am i setting $ query $ query = "SELECT count (*) agents @ agentcount; SELECT user_agent_parsed, User_agent_original , COUNT (user_agent_parsed) ascount, COUNT (*) / (@AgentCount) as a percentage by user_agent_parced by URI date DESC limit 50 "; This exact query will work properly if I put it in MySQL directly through a command line session. Do I need to release two separate php calls from mysql_query () and store the results first? I get the following error: There is an error in your SQL syntax; Instead of using a sub-selection and instead of using the 'SELECT user_agent_parsed, user_agent_original, ne...
Read more

url rewriting - How to implement the returnurl like SO in PHP? -

-
This URL should work even after the rewrite. Is this possible? Otherwise, I can only hardcoded everything If you are trying to create a login system with redirection You need to use the HTTP_REFERER header to find out where the user came from so that you can send it back there. The best way to do this is to use something like this in your login form: // - Login php & Lt; Input type = "password" name = "password" /> & Lt; Input type = "hidden" name = "returnrelale" value = "& lt ;? php echo $ redirectURL ;? & gt;" / & Gt; & Lt; / Form & gt; Please note that some ISP, browser or proxy will delete the referrer header, so you can not rely on each user to work fully. If you use a statement, to check whether the header exists or not, you can send those users back to the homepage or whatever. Edit If you are looking to use $ _SERVER ['REQUEST_URI'], if you are running Apache It sho...
Read more

Which Python client library should I use for CouchdB? -

-
I am starting to experiment with CouchDB because it looks like we have the right solution to certain problems That all the work will be on a new project, which does not have any legacy dependency, which the client library will suggest you use, and why? If we overlap any of the OS. Freeband is available only in the collection of its ports, but asks to use the library's project website. None of those people are Ubuntu, which is only with ships, since those two OSAs are not common in libraries, I am probably installing something from source (and hopefully if I have time, then Ubuntu and FreeBSD People pack the package). For those interests, I want to use CouchDB as a convenient intermediate storage space for data passed between different services - think of a message bus system, but less formalities with. For example, we have daemons that download and pars the web page, then send an interesting bit to other daemons for further processing. Many of them are ill-defined until the...
Read more