{"id":60,"date":"2024-10-17T13:20:29","date_gmt":"2024-10-17T13:20:29","guid":{"rendered":"https:\/\/burningthepasttvt.damo.sg\/?p=60"},"modified":"2024-10-17T13:20:29","modified_gmt":"2024-10-17T13:20:29","slug":"%e5%8a%a8%e6%80%81%e5%82%a8%e5%ad%98%e5%88%86%e9%85%8d","status":"publish","type":"post","link":"https:\/\/burningthepasttvt.damo.sg\/?p=60","title":{"rendered":"\u52a8\u6001\u50a8\u5b58\u5206\u914d"},"content":{"rendered":"\n<p>malloc()\uff1a\u7528\u4e8e\u5206\u914d\u5185\u5b58\u7a7a\u95f4\uff0c\u4f46\u4e0d\u5bf9\u5185\u5b58\u7a7a\u95f4\u8fdb\u884c\u4f18\u5316\u3002<\/p>\n\n\n\n<p>calloc():\u7528\u4e8e\u5206\u914d\u5185\u5b58\u7a7a\u95f4\uff0c\u5e76\u5c06\u5185\u5b58\u7a7a\u95f4\u5168\u90e8\u6e05\u96f6\u3002<\/p>\n\n\n\n<p>realloc():\u7528\u4e8e\u8c03\u6574\u5148\u524d\u5206\u914d\u7684\u5185\u5b58\u7a7a\u95f4\u5927\u5c0f\u3002<\/p>\n\n\n\n<p>free():\u7528\u4e8e\u91ca\u653e\u7531malloc()\u6216calloc()\u51fd\u6570\u52a8\u6001\u5206\u914d\u7684\u5185\u5b58\u7a7a\u95f4\u3002<\/p>\n\n\n\n<p>1.malloc()\u51fd\u6570<br>malloc()\u51fd\u6570\u7528\u4e8e\u5206\u914d\u5185\u5b58\u7a7a\u95f4\uff0c\u5176\u51fd\u6570\u539f\u578b\u5982\u4e0b\uff1a<br>void *malloc( unsigned int size);<br>\u529f\u80fd\uff1a\u5728\u5185\u5b58\u7684\u52a8\u6001\u5b58\u50a8\u533a\u4e2d\u5206\u914d\u4e00\u5757\u957f\u5ea6\u4e3a\u201csize\u201d\u5b57\u8282\u7684\u8fde\u7eed\u5185\u5b58\u7a7a\u95f4\u3002\u5982\u679c\u5206\u914d\u6210\u529f\uff0c\u5219\u8fd4\u56de\u6240\u5206\u914d\u5185\u5b58\u7a7a\u95f4\u7684\u9996\u5730\u5740\uff1b\u5982\u679c\u5206\u914d\u4e0d\u6210\u529f\uff0c\u5219\u8fd4\u56de\u7a7a\u6307\u9488NULL\u3002<br>\u4f8b\u5982\uff1a<br>int *p;<br>p=(int*)malloc(sizeof(int)): \/\/\u5206\u914d\u4e00\u4e2a4\u4e2a\u5b57\u8282\u7684\u5185\u5b58\u7a7a\u95f4<br>*p=100\uff1b \/\/\u5c06100\u4fdd\u5b58\u5230\u5206\u914d\u7684\u5185\u5b58\u7a7a\u95f4\u4e2d<br>printf(&#8220;a&#8221;, *p); \/\/\u8f93\u51fa100<\/p>\n\n\n\n<p>C\u8bed\u8a00\u4e2d\uff0c\u8fd8\u53ef\u4ee5\u4f7f\u7528malloc()\u51fd\u6570\u6765\u52a8\u6001\u751f\u6210\u6570\u7ec4\u3002\u4f8b\u5982\uff1a<br>#include&lt;stdio.h><\/p>\n\n\n\n<p>#include&lt;stdlib.h><\/p>\n\n\n\n<p>int main()<br>{<br>int *pa, i, n=5;  \/\/\u5176\u4e2dn\u4e3a\u8f93\u5165\u6570\u5b57\u957f\u5ea6\uff0c\u53ef\u66f4\u6539<br>pa=(int *)malloc(n*sizeof(int));\/\/\u5206\u914d\u4e00\u4e2a20\u4e2a\u5b57\u8282\u7684\u5185\u5b58\u7a7a\u95f4<br>for (i=0; i&lt;n;i++)<br>scanf(&#8220;%d&#8221;, &amp;pa[i]);<br>for (i=0;i&lt;n; i++)<br>printf(&#8220;%d&#8221;, pa[i]);<br>return 0;<br>}<\/p>\n\n\n\n<p>2.free()\u51fd\u6570<br>free()\u51fd\u6570\u7528\u4e8e\u91ca\u653e\u5185\u5b58\u7a7a\u95f4\uff0c\u5176\u51fd\u6570\u539f\u578b\u5982\u4e0b\uff1a<br>void free(void *p);<br>\u529f\u80fd\uff1a\u91ca\u653ep\u6240\u6307\u5411\u7684\u4e00\u5757\u5185\u5b58\u7a7a\u95f4\uff0cp\u662f\u6307\u5411\u7684\u88ab\u91ca\u653e\u7a7a\u95f4\u7684\u9996\u5730\u5740\uff0c\u88ab\u91ca\u653e\u7684\u5185\u5b58\u7a7a\u95f4\u5fc5\u987b\u662f\u7531malloc()\u6216calloc()\u51fd\u6570\u6240\u5206\u914d\u7684\u3002<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>malloc()\uff1a\u7528\u4e8e\u5206\u914d\u5185\u5b58\u7a7a\u95f4\uff0c\u4f46\u4e0d\u5bf9\u5185\u5b58\u7a7a\u95f4\u8fdb\u884c\u4f18\u5316\u3002 calloc():\u7528\u4e8e\u5206\u914d\u5185\u5b58\u7a7a\u95f4\uff0c\u5e76\u5c06\u5185\u5b58\u7a7a\u95f4 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-60","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/burningthepasttvt.damo.sg\/index.php?rest_route=\/wp\/v2\/posts\/60","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/burningthepasttvt.damo.sg\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/burningthepasttvt.damo.sg\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/burningthepasttvt.damo.sg\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/burningthepasttvt.damo.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=60"}],"version-history":[{"count":1,"href":"https:\/\/burningthepasttvt.damo.sg\/index.php?rest_route=\/wp\/v2\/posts\/60\/revisions"}],"predecessor-version":[{"id":61,"href":"https:\/\/burningthepasttvt.damo.sg\/index.php?rest_route=\/wp\/v2\/posts\/60\/revisions\/61"}],"wp:attachment":[{"href":"https:\/\/burningthepasttvt.damo.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=60"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/burningthepasttvt.damo.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=60"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/burningthepasttvt.damo.sg\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=60"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}