{"id":4723,"date":"2022-02-12T16:04:47","date_gmt":"2022-02-12T07:04:47","guid":{"rendered":"https:\/\/www.skyer9.pe.kr\/wordpress\/?p=4723"},"modified":"2025-12-17T11:53:13","modified_gmt":"2025-12-17T02:53:13","slug":"c-%ec%99%b8%eb%b6%80-%ed%8c%8c%ec%9d%bc%ec%9d%98-%ec%a0%84%ec%97%ad-%eb%b3%80%ec%88%98-%ec%a0%91%ea%b7%bc%ed%95%98%ea%b8%b0","status":"publish","type":"post","link":"https:\/\/www.skyer9.pe.kr\/wordpress\/?p=4723","title":{"rendered":"C &#8211; extern \uc678\ubd80 \ud30c\uc77c\uc758 \uc804\uc5ed \ubcc0\uc218 \uc811\uadfc\ud558\uae30"},"content":{"rendered":"<h1>C &#8211; \uc678\ubd80 \ud30c\uc77c\uc758 \uc804\uc5ed \ubcc0\uc218 \uc811\uadfc\ud558\uae30<\/h1>\n<p>\uc804\uc5ed \ubcc0\uc218\ub97c \uc678\ubd80\ud30c\uc77c\uc5d0\uc11c \uc811\uadfc\ud558\uac8c \ud558\ub824\uace0,<br \/>\n\ud5e4\ub354\ud30c\uc77c\uc5d0\uc11c \uc0dd\uc131\ud558\ub294 \uac83\uc740 \uc544\uc8fc \uc798\ubabb\ub41c \uc811\uadfc\ubc95\uc774\ub2e4.<\/p>\n<p><code>extern<\/code> \uc744 \uc774\uc6a9\ud558\uba74 \uac04\ub2e8\ud788 \uc678\ubd80\ud30c\uc77c\uc758 \uc804\uc5ed\ubcc0\uc218\uc5d0 \uc811\uadfc\ud560 \uc218 \uc788\ub2e4.<\/p>\n<h2>\uc0ac\uc6a9\ubc95<\/h2>\n<p>common.h<\/p>\n<pre><code class=\"language-c\">\/\/ \uc120\uc5b8\n#ifndef COMMON_H\n#define COMMON_H\n\nextern int num;\n\n#endif<\/code><\/pre>\n<p>main.c<\/p>\n<pre><code class=\"language-c\">\/\/ \uc0dd\uc131\nint num = 10;\n\nint main() {\n    \/\/ ......\n    return 0;\n}<\/code><\/pre>\n<p>test.c<\/p>\n<pre><code class=\"language-c\">#include &quot;common.h&quot;\n\nvoid mytest() {\n    printf(&quot;%d\\n&quot;, num);\n}<\/code><\/pre>\n<h2>\uc8fc\uc758\uc0ac\ud56d<\/h2>\n<pre><code class=\"language-c\">extern int num = 20;<\/code><\/pre>\n<p>extern \uc740 \uc678\ubd80 \ubcc0\uc218\ub97c \uc0ac\uc6a9\ud55c\ub2e4\ub294 \uac70\ub2e4.<br \/>\n\uc989, \ucd08\uae30\ud654\uae4c\uc9c0 \uc2dc\ub3c4\ud558\ub824\uba74 \uacbd\uace0\uac00 \ub72c\ub2e4.<br \/>\n\ub610\ud55c, \ubcc0\uc218 \uc120\uc5b8\uc774 \uc544\ub2c8\ub77c \uc0dd\uc131\uc73c\ub85c \uc778\uc2dd\ub41c\ub2e4.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>C &#8211; \uc678\ubd80 \ud30c\uc77c\uc758 \uc804\uc5ed \ubcc0\uc218 \uc811\uadfc\ud558\uae30 \uc804\uc5ed \ubcc0\uc218\ub97c \uc678\ubd80\ud30c\uc77c\uc5d0\uc11c \uc811\uadfc\ud558\uac8c \ud558\ub824\uace0, \ud5e4\ub354\ud30c\uc77c\uc5d0\uc11c \uc0dd\uc131\ud558\ub294 \uac83\uc740 \uc544\uc8fc \uc798\ubabb\ub41c \uc811\uadfc\ubc95\uc774\ub2e4. extern \uc744 \uc774\uc6a9\ud558\uba74 \uac04\ub2e8\ud788 \uc678\ubd80\ud30c\uc77c\uc758 \uc804\uc5ed\ubcc0\uc218\uc5d0 \uc811\uadfc\ud560 \uc218 \uc788\ub2e4. \uc0ac\uc6a9\ubc95 common.h \/\/ \uc120\uc5b8 #ifndef COMMON_H #define COMMON_H extern int num; #endif main.c \/\/ \uc0dd\uc131 int num = 10; int main() { \/\/ &#8230;&#8230; return 0; } test.c\u2026 <span class=\"read-more\"><a href=\"https:\/\/www.skyer9.pe.kr\/wordpress\/?p=4723\">Read More &raquo;<\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23],"tags":[],"class_list":["post-4723","post","type-post","status-publish","format-standard","hentry","category-linux"],"_links":{"self":[{"href":"https:\/\/www.skyer9.pe.kr\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/4723","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.skyer9.pe.kr\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.skyer9.pe.kr\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.skyer9.pe.kr\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.skyer9.pe.kr\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4723"}],"version-history":[{"count":6,"href":"https:\/\/www.skyer9.pe.kr\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/4723\/revisions"}],"predecessor-version":[{"id":11207,"href":"https:\/\/www.skyer9.pe.kr\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/4723\/revisions\/11207"}],"wp:attachment":[{"href":"https:\/\/www.skyer9.pe.kr\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4723"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.skyer9.pe.kr\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4723"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.skyer9.pe.kr\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4723"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}