{"id":27539,"date":"2024-03-16T08:37:57","date_gmt":"2024-03-16T08:37:57","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-define-and-use-pointers-to-structures-in-the-c-language\/"},"modified":"2024-03-22T11:16:53","modified_gmt":"2024-03-22T11:16:53","slug":"how-to-define-and-use-pointers-to-structures-in-the-c-language","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-define-and-use-pointers-to-structures-in-the-c-language\/","title":{"rendered":"How to define and use pointers to structures in the C language."},"content":{"rendered":"<p>Below are the definition and usage methods of C language structure pointers.<\/p>\n<ol>\n<li>Define a structure type: First, it is necessary to define a structure type that can contain multiple fields (member variables).<\/li>\n<\/ol>\n<p>For example, define a struct type that represents student information.<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-class\"><span class=\"hljs-keyword\">struct<\/span> <span class=\"hljs-title\">Student<\/span> {<\/span>\r\n    <span class=\"hljs-type\">char<\/span> name[<span class=\"hljs-number\">50<\/span>];\r\n    <span class=\"hljs-type\">int<\/span> age;\r\n    <span class=\"hljs-type\">float<\/span> score;\r\n};\r\n<\/code><\/pre>\n<ol>\n<li>Declare a pointer variable of a struct: Use the defined struct type to declare a struct pointer variable.<\/li>\n<\/ol>\n<p>For example, declaring a pointer variable pointing to a student structure:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-class\"><span class=\"hljs-keyword\">struct<\/span> <span class=\"hljs-title\">Student<\/span> *<span class=\"hljs-title\">ptr<\/span>;<\/span>\r\n<\/code><\/pre>\n<ol>\n<li>Dynamically allocate memory: Assign memory space for a struct pointer variable.<\/li>\n<\/ol>\n<p>For example, dynamically allocate memory using the malloc function.<\/p>\n<pre class=\"post-pre\"><code>ptr = (<span class=\"hljs-keyword\">struct<\/span> Student*)<span class=\"hljs-built_in\">malloc<\/span>(<span class=\"hljs-keyword\">sizeof<\/span>(<span class=\"hljs-keyword\">struct<\/span> Student));\r\n<\/code><\/pre>\n<ol>\n<li>Using a struct pointer: accessing and modifying the fields of a struct using pointer variables.<\/li>\n<\/ol>\n<p>For example, accessing and modifying fields in a student structure.<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-built_in\">strcpy<\/span>(ptr-&gt;name, <span class=\"hljs-string\">\"Tom\"<\/span>);\r\nptr-&gt;age = <span class=\"hljs-number\">18<\/span>;\r\nptr-&gt;score = <span class=\"hljs-number\">89.5<\/span>;\r\n<\/code><\/pre>\n<ol>\n<li>Freeing memory: After using a structure pointer, memory space needs to be released.<\/li>\n<\/ol>\n<p>For example, releasing memory using the free function:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-built_in\">free<\/span>(ptr);\r\n<\/code><\/pre>\n<p>The complete example code is as follows:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;stdio.h&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;stdlib.h&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;string.h&gt;<\/span><\/span>\r\n\r\n<span class=\"hljs-class\"><span class=\"hljs-keyword\">struct<\/span> <span class=\"hljs-title\">Student<\/span> {<\/span>\r\n    <span class=\"hljs-type\">char<\/span> name[<span class=\"hljs-number\">50<\/span>];\r\n    <span class=\"hljs-type\">int<\/span> age;\r\n    <span class=\"hljs-type\">float<\/span> score;\r\n};\r\n\r\n<span class=\"hljs-type\">int<\/span> <span class=\"hljs-title function_\">main<\/span><span class=\"hljs-params\">()<\/span> {\r\n    <span class=\"hljs-class\"><span class=\"hljs-keyword\">struct<\/span> <span class=\"hljs-title\">Student<\/span> *<span class=\"hljs-title\">ptr<\/span>;<\/span>\r\n    ptr = (<span class=\"hljs-keyword\">struct<\/span> Student*)<span class=\"hljs-built_in\">malloc<\/span>(<span class=\"hljs-keyword\">sizeof<\/span>(<span class=\"hljs-keyword\">struct<\/span> Student));\r\n    <span class=\"hljs-keyword\">if<\/span> (ptr == <span class=\"hljs-literal\">NULL<\/span>) {\r\n        <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"Memory allocation failed.\\n\"<\/span>);\r\n        <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">-1<\/span>;\r\n    }\r\n    <span class=\"hljs-built_in\">strcpy<\/span>(ptr-&gt;name, <span class=\"hljs-string\">\"Tom\"<\/span>);\r\n    ptr-&gt;age = <span class=\"hljs-number\">18<\/span>;\r\n    ptr-&gt;score = <span class=\"hljs-number\">89.5<\/span>;\r\n    \r\n    <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"Name: %s\\n\"<\/span>, ptr-&gt;name);\r\n    <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"Age: %d\\n\"<\/span>, ptr-&gt;age);\r\n    <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"Score: %.2f\\n\"<\/span>, ptr-&gt;score);\r\n    \r\n    <span class=\"hljs-built_in\">free<\/span>(ptr);\r\n    \r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>;\r\n}\r\n<\/code><\/pre>\n<p>Output:<\/p>\n<pre class=\"post-pre\"><code>Name: Tom\r\nAge: 18\r\nScore: 89.50\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Below are the definition and usage methods of C language structure pointers. Define a structure type: First, it is necessary to define a structure type that can contain multiple fields (member variables). For example, define a struct type that represents student information. struct Student { char name[50]; int age; float score; }; Declare a pointer [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-27539","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to define and use pointers to structures in the C language. - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/blog\/how-to-define-and-use-pointers-to-structures-in-the-c-language\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to define and use pointers to structures in the C language.\" \/>\n<meta property=\"og:description\" content=\"Below are the definition and usage methods of C language structure pointers. Define a structure type: First, it is necessary to define a structure type that can contain multiple fields (member variables). 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