https://devzone.nordicsemi.com/f/nordic-q-a/2075/why-use-do-while#define APP_ERROR_CHECK(ERR_CODE) do { const uint32_t LOCAL_ERR_CODE = (ERR_CODE); if (LOCAL_ERR_CODE != NRF_SUCCESS) { APP_ERROR_HANDLER(LOCAL_ERR_CODE); } } while (0) I saw this a lot, is it for save one int from stack? if so howen-USTelligent Community 13Thu, 03 Apr 2014 08:20:07 GMThttps://devzone.nordicsemi.com/thread/8909?ContentTypeID=1Thu, 03 Apr 2014 08:20:07 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a5ef9142-3f1a-4c95-b8fe-8e08df00180eH&#229;kon Alseth<p>Hi Julian,</p> <p>This is a way of nesting a multistatement function. It&#39;s widely used in C. <a href="http://stackoverflow.com/questions/257418/do-while-0-what-is-it-good-for">stackoverflow.com/.../do-while-0-what-is-it-good-for</a></p> <p>-H</p><div style="clear:both;"></div>