Evaluating type identifiers (%d) in strings, in C -

-

i working on mac osx , using bash shell. working in c , trying create file renumber files. important part of code follows:

int i; (i=0; i<numberoffiles; i++) {     strcpy(filename,""); //set null     char append[formatlength]; //string being appended     sprintf(append,"%%0%dd", formatlength); //example output: %04d     strcat(filename,fileprefix); //attached prefix     strcat(filename,append); //attaches appended part     //missing code: part equvaluates %04d int i, such 0023. }

this gets me correct string format looking (say formatlength=4): fileprefix+%04d. however, need evaluate %04d in string , evaluate i, files like: file0001, file0002, etc.

would have ideas. help.

if understand question correctly, should able say

char result[(sizeof fileprefix/sizeof (char)) + formatlength]; sprintf(result, filename, i);

since filename looks "fileprefix%04d". desired filename stored in result. not recommend re-storing in filenameby saying sprintf(filename, filename, i) because filename may small (for example, when formatlength = 9).

note need (sizeof fileprefix/sizeof (char)) find size of fileprefix (which char*), , add formatlength see how many more chars need after that


Comments

Post a Comment

Popular posts from this blog

javascript - DIV "hiding" when changing dropdown value -

-
this related previous question asked: hide / show multiple divs i have code in place previous question , seems work ok apart when change value in dropdown "after" ticket selection made. i have number of javascrpts in place wondering if there clash somewhere? first bit of code in head of document. <head> <script type="text/javascript"> $(function() { $('.cat_dropdown').change(function() { $('#paymethod').toggle($(this).val() >= 2); }); }); </script> <script type="text/javascript"> $(document).ready(function () { $(".paymentmethod").click(function () { $(".paymentinfo").hide(); switch ($(this).val()) { case "credit card authorisation": $("#pay0").show("slow"); break; ...
Read more

html - Accumulated Depreciation of Assets on php -

-
i have problem table print out asset accumulated depreciation on php, stright line method. $query = mysqli_query($connect, "select current_value, salvage_value, useful_life, placed_service assets"); if(!$query){ echo 'could not run query b: ' . mysqli_error($connect); exit; } while($asset = mysqli_fetch_row($query)){ echo "assets :"; print_r($asset); $month = 12; $year = date('y',strtotime($asset[3])); $first_year = $month - ((int)date('m',strtotime($asset[3]))-1); $last_year = $month - $first_year; $first = round((($asset[0] - $asset[1])/$asset[2])*(($first_year)/12),0); $last = round((($asset[0] - $asset[1])/$asset[2])*(($last_year)/12),0); $others = ($asset[0] - $asset[1])/$asset[2]; echo "<table border=1>"; echo "<tr><th>year</th><th>book value year start</th><th>depreciation expense</th><th...
Read more

Update QSQLTableModel in QT C++ -

-
i created 1 dialog used bindvalues in sql database, , can save every new record sucessfully. problem i've got dialog qsqltablemodel shows information database. every time make new record must close program , run again see changes in showinformationdialog() . know way such don't need close program update information in showinformationdialog() ? you can use select() method of qsqltablemodel class repopulate model data database. bound views updated automatically. suggest connecting signal wherever update data in database (i.e. dialog updating sql database) custom slot in showinformationdialog() calls select() of qsqltablemodel object. assume have qmainwindow object parent of both dialogues best place establish connection. also since showinformationdialog() 's model used viewing data consider using qsqlquerymodel . if used setquery() method should used instead of select() otherwise (the connection of signal showinformationdialog() 's slot) same. ...
Read more