{"id":115,"date":"2007-01-06T16:47:37","date_gmt":"2007-01-06T08:47:37","guid":{"rendered":"http:\/\/127.0.0.1\/website_linux\/blog\/?p=115"},"modified":"2007-01-06T16:47:37","modified_gmt":"2007-01-06T08:47:37","slug":"linux%e4%b8%8bgcc%e6%97%a0%e6%b3%95include","status":"publish","type":"post","link":"https:\/\/opgogo.com\/blog2\/?p=115","title":{"rendered":"Linux\u4e0bgcc\u65e0\u6cd5#include <math.h>"},"content":{"rendered":"<p>Linux\u4e0bgcc\u65e0\u6cd5#include <math.h><\/p>\n<p>\u5728google\u4e0a\u641c\u7d22\u89e3\u51b3\u65b9\u6848\uff0c\u5f97\u5230\u4e0b\u9762\u7684\u7ed3\u679c\uff1a<\/p>\n<p>2.4.1 \u5e38\u89c1 cc \u95ee\u9898<\/p>\n<p>2.4.1.1. \u6211\u5c1d\u8bd5\u5199\u4e00\u4e2a\u7a0b\u5e8f\uff0c\u5176\u4e2d\u4f7f\u7528\u4e86 sin() \u8fd9\u4e2a\u51fd\u6570\u3002\u4f46\u662f\u6211\u5374\u5f97\u5230\u4e86\u5982\u4e0b\u7684\u9519\u8bef\u3002\u8fd9\u4e2a\u9519\u8bef\u662f\u4ec0\u4e48\u610f\u601d\uff1f<\/p>\n<p>\/var\/tmp\/cc0143941.o: Undefined symbol `_sin&#39; referenced from text segment<\/p>\n<p>\u5f53\u4f7f\u7528\u50cf sin() \u8fd9\u6837\u7684\u6570\u5b66\u51fd\u6570\u7684\u65f6\u5019\uff0c\u4f60\u5fc5 \u987b\u544a\u8bc9 cc \u628a\u6570\u5b66\u51fd\u6570\u5e93\u7ed9\u8fde\u63a5\u8fdb\u6765\uff0c\u5c31\u50cf\u8fd9\u6837\uff1a<\/p>\n<p>% cc -o foobar foobar.c -lm<\/p>\n<p>2.4.1.2. \u597d\u7684\uff0c\u6211\u5199\u4e86\u4e00\u4e2a\u7b80\u5355\u7684\u7a0b\u5e8f\uff0c\u7ec3\u4e60\u4f7f\u7528 -lm\u3002\u4e5f \u5c31\u662f\u8ba1\u7b97 2.1 \u7684 6 \u6b21\u65b9\u3002<\/p>\n<p>#include <stdio.h><\/p>\n<p>int main() {<br \/>\nfloat f;<\/p>\n<p>f = pow(2.1, 6);<br \/>\nprintf(&#8220;2.1 ^ 6 = %f\\n&#8221;, f);<br \/>\nreturn 0;<br \/>\n}<\/p>\n<p>\u7136\u540e\u6211\u7f16\u8bd1\uff1a<\/p>\n<p>% cc temp.c -lm<\/p>\n<p>\u5c31\u50cf\u4f60\u8bf4\u7684\u6211\u5e94\u8be5\u505a\u7684\u90a3\u6837\u3002\u4f46\u662f\u6211\u5728\u8fd0\u884c\u7684\u65f6\u5019\u5374\u6709\u5982\u4e0b\u63d0\u793a\uff1a<\/p>\n<p>% .\/a.out<br \/>\n2.1 ^ 6 = 1023.000000<\/p>\n<p>\u8fd9\u4e2a \u4e0d \u662f\u6b63\u786e\u7684\u7b54\u6848\uff01\u5230\u5e95\u600e\u4e48\u4e86\uff1f<\/p>\n<p>\u5f53\u7f16\u8bd1\u5668\u770b\u89c1\u4f60\u8c03\u7528\u4e86\u4e00\u4e2a\u51fd\u6570\uff0c\u5b83\u4f1a\u68c0\u67e5\u662f\u5426\u5df2\u7ecf\u6709\u4e86\u4e00\u4e2a\u76f8\u914d\u5408\u7684 \u539f\u59cb\u7c7b\u578b (prototype)\uff0c\u5982\u679c\u6ca1\u6709\uff0c\u7f16\u8bd1\u5668\u4f1a\u5047\u5b9a\u51fd\u6570\u7684\u8fd4\u56de\u503c\u662f \u6574\u6570\uff0c\u6070\u6070\u4e0d\u662f\u4f60\u7684\u7a0b\u5e8f\u60f3\u8981\u7684\u7ed3\u679c\u3002<\/p>\n<p>2.4.1.3. \u90a3\u4e48\u6211\u600e\u4e48\u624d\u80fd\u6539\u6b63\u8fd9\u4e2a\u9519\u8bef\uff1f<\/p>\n<p>\u6570\u5b66\u51fd\u6570\u7684\u58f0\u660e\u539f\u578b\u90fd\u5728 math.h \u91cc\u9762\u3002\u5982\u679c\u4f60\u5f15\u7528\u4e86\u8fd9\u4e2a\u6587\u4ef6\uff0c\u7f16\u8bd1\u5668\u5c31\u80fd\u627e\u5230\u8fd9\u4e2a\u539f\u578b\u7136\u540e\u5c31\u4e0d\u4f1a\u5bf9\u4f60\u7684\u8ba1\u7b97\u505a\u5947\u602a\u7684 \u5e72\u6270\u3002<\/p>\n<p>#include <math.h><br \/>\n#include <stdio.h><\/p>\n<p>int main() {<br \/>\n&#8230;<\/p>\n<p>\u50cf\u4ee5\u524d\u4e00\u6837\u7f16\u8bd1\uff0c\u7136\u540e\u518d\u8fd0\u884c\uff1a<\/p>\n<p>% .\/a.out<br \/>\n2.1 ^ 6 = 85.766121<\/p>\n<p>\u5982\u679c\u4f60\u4f7f\u7528\u4e86\u4efb\u4f55\u4e00\u4e2a\u6570\u5b66\u51fd\u6570\uff0c\u4e00\u5b9a\u8981\u8bb0\u5f97 \u5f15\u7528 math.h \u8fd9\u4e2a\u6587\u4ef6\uff0c\u5e76\u4e14\u8fde\u63a5\u6570\u5b66\u51fd\u6570\u5e93\u3002<\/p>\n<p>2.4.1.4. \u6211\u7f16\u8bd1\u4e86\u4e00\u4e2a\u6587\u4ef6\u53eb foobar.c \u4f46\u662f\u6211\u6ca1\u6709\u627e \u5230\u53eb foobar \u7684\u6267\u884c\u6587\u4ef6\u3002\u8fd9\u4e2a\u6587\u4ef6\u5230\u54ea\u91cc\u53bb\u4e86\uff1f<\/p>\n<p>\u8bb0\u4f4f\uff0c\u9664\u975e\u4f60\u6307\u5b9a\u4e00\u4e2a\u540d\u5b57\uff0ccc\u4f1a\u628a\u7f16\u8bd1\u51fa\u7684\u6587 \u4ef6\u53eb\u505a a.out\u3002\u4f7f\u7528 -o filename \u8fd9\u4e2a\u9009 \u9879\uff1a<\/p>\n<p>% cc -o foobar foobar.c<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Linux\u4e0bgcc\u65e0\u6cd5#include \u5728google\u4e0a\u641c\u7d22\u89e3\u51b3\u65b9\u6848\uff0c\u5f97\u5230\u4e0b\u9762\u7684\u7ed3\u679c\uff1a 2.4.1 \u5e38\u89c1 cc \u95ee\u9898 2.4.1.1. \u6211\u5c1d\u8bd5\u5199\u4e00\u4e2a\u7a0b\u5e8f\uff0c\u5176\u4e2d\u4f7f\u7528\u4e86 sin() \u8fd9\u4e2a\u51fd\u6570\u3002\u4f46\u662f\u6211\u5374\u5f97\u5230&hellip; <\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[28],"tags":[],"class_list":["post-115","post","type-post","status-publish","format-standard","hentry","category-computer"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/opgogo.com\/blog2\/index.php?rest_route=\/wp\/v2\/posts\/115","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/opgogo.com\/blog2\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/opgogo.com\/blog2\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/opgogo.com\/blog2\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/opgogo.com\/blog2\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=115"}],"version-history":[{"count":0,"href":"https:\/\/opgogo.com\/blog2\/index.php?rest_route=\/wp\/v2\/posts\/115\/revisions"}],"wp:attachment":[{"href":"https:\/\/opgogo.com\/blog2\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=115"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/opgogo.com\/blog2\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=115"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/opgogo.com\/blog2\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=115"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}