Databases
StackOverflow2013
Postsdbo
POPrinting int type with %lu - C+XINU
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POPrinting int type with %lu - C+XINU
    primarykey
    data
    text
    <p>I have a given code, in my opinion there is something wrong with that code: I compile under XINU.</p> <p>The next variables are relevant :</p> <pre class="lang-c prettyprint-override"><code>unsigned long ularray[]; int num; char str[100]; </code></pre> <p>There is a function returns int:</p> <pre class="lang-c prettyprint-override"><code>int func(int i) { return ularray[i]; } </code></pre> <p>now the code is like this:</p> <pre class="lang-c prettyprint-override"><code>num = func(i); sprintf(str, "number = %lu\n", num); printf(str); </code></pre> <p>The problem is I get big numbers while printing with %lu, which is not correct.</p> <p>If i change the <strong>%lu</strong> to <strong>%d</strong>, i get the correct number. For example: with %lu i get 27654342, while with %d i get 26, the latter is correct;</p> <p>The variables are given, the declaration of the function is given, i write the body but it must return int;</p> <p>My questions are:</p> <ol> <li><p>I'm not familiar with 'sprintf' maybe the problem is there?</p></li> <li><p>I assigned unsigned long to int and then print the int with %lu, is That correct?</p></li> <li><p>How can i fix the problem?</p></li> </ol> <p>Thanks in advance.</p> <p>Thanks everyone for answering. I just want to mention I'm working under XINU, well i changed the order of the compilation of the files and what you know... its working and showing same numbers on %lu and %d.</p> <p>I'm well aware that assigning 'unsigned long' to int and then printing with %lu is incorrect coding and may result loss of data. But as i said, the code is given, i couldn't change the variables and the printing command.</p> <p>I had no errors or warnings btw. I have no idea why changing the compilation order fixed the problem, if someone have an idea you are more then welcome to share.</p> <p>I want to thank all of you who tried to help me.</p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USavi.tavdi
    1. USavi.tavdi
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COWhy are you casting to `int`? PS `"%lu"` is the proper format specifier for `unsigned long`... `"%d"` treats the argument as a `signed int`, which works here since `num` is `signed int`. You should be careful when mixing signedness like that.
      singulars
      1. POPrinting int type with %lu - C+XINU
      1. USoldrinb
    2. COWhy exactly aren't you using `%d`? The fact that you're getting different results by moving the code around _shows_ that you're doing something wrong (knowingly too - not good). What part of the code can't you change?
      singulars
      1. POPrinting int type with %lu - C+XINU
      1. USMat
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload