Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p><code>params</code> is an <code>int [2]</code>, which decays to an <code>int *</code> when passed to a function, and functions that take <code>int []</code>s as parameters are really taking <code>int *</code>s behind the scenes. Unfortunately, <code>&amp;params</code> is an <code>int(*)[2]</code>, which is closer to an <code>int *</code> than the <code>int **</code> (same as <code>int *[]</code> in a function parameter) you need.</p> <p>Your best option is to change your function to:</p> <pre><code>double strcmp95(char *ying, char *yang, long y_length, int *ind_c) </code></pre> <p>And assume that the caller willl always pass an <code>int[2]</code>. Or you can explicitly ask for an <code>int(*)[2]</code> - a pointer to an array of 2 <code>int</code>s:</p> <pre><code>double strcmp95(char *ying, char *yang, long y_length, int (*ind_c)[2]) </code></pre> <p>But this seems unnecessary to guarantee that two <code>int</code>s are passed, and if you need to account for the possibility of more than two <code>int</code>s in the array is unsuitable. A better way is:</p> <pre><code>double strcmp95(char *ying, char *yang, long y_length, int *ind_c, size_t len) </code></pre> <p><code>size_t</code> is an unsigned integer type guaranteed to be able to hold the size of any object or any array index, and in this case the <code>len</code> parameter is the length of your array (<code>(sizeof params / sizeof params[0])</code> if you want to be fancy/forward thinking, <code>2</code> if you don't). That's the safest route.</p> <p>By the way, your <code>y_length</code> parameter should also be a <code>size_t</code> variable. <code>long</code> is signed, and I'd hate to have to handle a string of -1 length. Even if you use <code>unsigned long</code>, there's no guarantee that <code>long</code> will be sufficient to handle a system's sizes (or, conversely, that an errantly large <code>long</code> value will be too big for your system to handle and cause confusion).</p>
    singulars
    1. This table or related slice is empty.
    1. POPassing a pointer to an int array to a c-function
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USChris Lutz
    1. USChris Lutz
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POPassing a pointer to an int array to a c-function
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTAcceptedByOriginator
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. CONo, `&params` is not the same as `params`. The addresses that they hold are the same but `&params` has type `int (*)[2]`.
      singulars
      1. PO
      1. USJens Gustedt
    2. COI opted for int (*ind_c)[2]. The function is only ever gonna get called by myself, and only in one place. That is never gonna change. So that option seems very safe in this scenario.
      singulars
      1. PO
      1. USJoseph Tura
    3. CO@Jens - This is what happens when you stay up until 5 a.m. after saying "I'm going to go to bed early tonight and wake up at a reasonable hour." Fixing.
      singulars
      1. PO
      1. USChris Lutz
 

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