{"id":28122,"date":"2024-03-16T09:46:28","date_gmt":"2024-03-16T09:46:28","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-sort-an-array-of-structs-in-the-c-language\/"},"modified":"2024-03-22T12:41:18","modified_gmt":"2024-03-22T12:41:18","slug":"how-to-sort-an-array-of-structs-in-the-c-language","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-sort-an-array-of-structs-in-the-c-language\/","title":{"rendered":"How to sort an array of structs in the C language?"},"content":{"rendered":"<p>In C language, you can use the standard library function qsort() to sort arrays of structures. qsort() is a fast sorting function in the C standard library that requires a comparison function for determining the order of elements.<\/p>\n<p>Here is an example demonstrating how to use the qsort() function to sort an array of structures based on a certain attribute.<\/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-comment\">\/\/ \u5b9a\u4e49\u7ed3\u6784\u4f53<\/span>\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\">20<\/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-comment\">\/\/ \u6bd4\u8f83\u51fd\u6570<\/span>\r\n<span class=\"hljs-type\">int<\/span> <span class=\"hljs-title function_\">compare<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">const<\/span> <span class=\"hljs-type\">void<\/span> *a, <span class=\"hljs-type\">const<\/span> <span class=\"hljs-type\">void<\/span> *b)<\/span> {\r\n    <span class=\"hljs-class\"><span class=\"hljs-keyword\">struct<\/span> <span class=\"hljs-title\">student<\/span> *<span class=\"hljs-title\">studentA<\/span> =<\/span> (<span class=\"hljs-keyword\">struct<\/span> student *)a;\r\n    <span class=\"hljs-class\"><span class=\"hljs-keyword\">struct<\/span> <span class=\"hljs-title\">student<\/span> *<span class=\"hljs-title\">studentB<\/span> =<\/span> (<span class=\"hljs-keyword\">struct<\/span> student *)b;\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u6309\u7167\u5e74\u9f84\u5347\u5e8f\u6392\u5e8f<\/span>\r\n    <span class=\"hljs-keyword\">if<\/span> (studentA-&gt;age &lt; studentB-&gt;age)\r\n        <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">-1<\/span>;\r\n    <span class=\"hljs-keyword\">else<\/span> <span class=\"hljs-keyword\">if<\/span> (studentA-&gt;age &gt; studentB-&gt;age)\r\n        <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">1<\/span>;\r\n    <span class=\"hljs-keyword\">else<\/span>\r\n        <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>;\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\">students<\/span>[3];<\/span>\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u521d\u59cb\u5316\u7ed3\u6784\u4f53\u6570\u7ec4<\/span>\r\n    <span class=\"hljs-built_in\">strcpy<\/span>(students[<span class=\"hljs-number\">0<\/span>].name, <span class=\"hljs-string\">\"Alice\"<\/span>);\r\n    students[<span class=\"hljs-number\">0<\/span>].age = <span class=\"hljs-number\">20<\/span>;\r\n    students[<span class=\"hljs-number\">0<\/span>].score = <span class=\"hljs-number\">85.6<\/span>;\r\n\r\n    <span class=\"hljs-built_in\">strcpy<\/span>(students[<span class=\"hljs-number\">1<\/span>].name, <span class=\"hljs-string\">\"Bob\"<\/span>);\r\n    students[<span class=\"hljs-number\">1<\/span>].age = <span class=\"hljs-number\">18<\/span>;\r\n    students[<span class=\"hljs-number\">1<\/span>].score = <span class=\"hljs-number\">92.3<\/span>;\r\n\r\n    <span class=\"hljs-built_in\">strcpy<\/span>(students[<span class=\"hljs-number\">2<\/span>].name, <span class=\"hljs-string\">\"Charlie\"<\/span>);\r\n    students[<span class=\"hljs-number\">2<\/span>].age = <span class=\"hljs-number\">22<\/span>;\r\n    students[<span class=\"hljs-number\">2<\/span>].score = <span class=\"hljs-number\">78.9<\/span>;\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u4f7f\u7528qsort()\u51fd\u6570\u8fdb\u884c\u6392\u5e8f<\/span>\r\n    qsort(students, <span class=\"hljs-number\">3<\/span>, <span class=\"hljs-keyword\">sizeof<\/span>(<span class=\"hljs-keyword\">struct<\/span> student), compare);\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u6253\u5370\u6392\u5e8f\u540e\u7684\u7ed3\u679c<\/span>\r\n    <span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-type\">int<\/span> i = <span class=\"hljs-number\">0<\/span>; i &lt; <span class=\"hljs-number\">3<\/span>; i++) {\r\n        <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"Name: %s, Age: %d, Score: %.1f\\n\"<\/span>, students[i].name, students[i].age, students[i].score);\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>;\r\n}\r\n<\/code><\/pre>\n<p>In the example above, we defined a struct called student, which includes three attributes: name, age, and score. We then defined a comparison function compare() to compare the ages of two structs. In the main() function, we initialized a struct array called students containing three students, and used the qsort() function to sort them. Finally, we printed the sorted result.<\/p>\n<p>Note that when using the qsort() function to sort, you need to provide the size of each element (sizeof(struct student)) and a comparison function. The comparison function should return an integer value that indicates the relationship between two elements. A return value less than 0 indicates the first element is less than the second element, a return value greater than 0 indicates the first element is greater than the second element, and a return value equal to 0 indicates that the two elements are equal. In this example, we are sorting in ascending order by age, so the comparison function will compare based on the age attribute.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In C language, you can use the standard library function qsort() to sort arrays of structures. qsort() is a fast sorting function in the C standard library that requires a comparison function for determining the order of elements. Here is an example demonstrating how to use the qsort() function to sort an array of structures [&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-28122","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 sort an array of structs 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-sort-an-array-of-structs-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 sort an array of structs in the C language?\" \/>\n<meta property=\"og:description\" content=\"In C language, you can use the standard library function qsort() to sort arrays of structures. qsort() is a fast sorting function in the C standard library that requires a comparison function for determining the order of elements. 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