{"id":9991,"date":"2024-03-14T10:25:38","date_gmt":"2024-03-14T10:25:38","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-implement-a-hash-table-using-the-c-language\/"},"modified":"2024-03-20T16:49:58","modified_gmt":"2024-03-20T16:49:58","slug":"how-to-implement-a-hash-table-using-the-c-language","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-implement-a-hash-table-using-the-c-language\/","title":{"rendered":"How to implement a hash table using the C language?"},"content":{"rendered":"<p>The basic steps to implementing a hash table are as follows:<\/p>\n<ol>\n<li>Definition of the data structure of a hash table including the size of the hash table, the number of buckets, and the structure of the buckets.<\/li>\n<li>Implement a hash function: mapping keys to bucket indices.<\/li>\n<li>Implementing functions for hash table operations, such as insertion, search, and deletion.<\/li>\n<li>Resolving conflicts: When multiple keys map to the same bucket, methods like using linked lists or open addressing are needed to handle conflicts.<\/li>\n<\/ol>\n<p>Here is a simple example code in C language for implementing a hash table.<\/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-meta\">#<span class=\"hljs-keyword\">define<\/span> TABLE_SIZE 10<\/span>\r\n\r\n<span class=\"hljs-keyword\">typedef<\/span> <span class=\"hljs-class\"><span class=\"hljs-keyword\">struct<\/span> <span class=\"hljs-title\">Node<\/span> {<\/span>\r\n    <span class=\"hljs-type\">char<\/span>* key;\r\n    <span class=\"hljs-type\">int<\/span> value;\r\n    <span class=\"hljs-class\"><span class=\"hljs-keyword\">struct<\/span> <span class=\"hljs-title\">Node<\/span>* <span class=\"hljs-title\">next<\/span>;<\/span>\r\n} Node;\r\n\r\nNode* table[TABLE_SIZE];\r\n\r\n<span class=\"hljs-type\">int<\/span> <span class=\"hljs-title function_\">hash_function<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">char<\/span>* key)<\/span> {\r\n    <span class=\"hljs-type\">int<\/span> hash = <span class=\"hljs-number\">0<\/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-built_in\">strlen<\/span>(key); i++) {\r\n        hash += key[i];\r\n    }\r\n    <span class=\"hljs-keyword\">return<\/span> hash % TABLE_SIZE;\r\n}\r\n\r\n<span class=\"hljs-type\">void<\/span> <span class=\"hljs-title function_\">insert<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">char<\/span>* key, <span class=\"hljs-type\">int<\/span> value)<\/span> {\r\n    <span class=\"hljs-type\">int<\/span> index = hash_function(key);\r\n    Node* new_node = (Node*)<span class=\"hljs-built_in\">malloc<\/span>(<span class=\"hljs-keyword\">sizeof<\/span>(Node));\r\n    new_node-&gt;key = key;\r\n    new_node-&gt;value = value;\r\n    new_node-&gt;next = table[index];\r\n    table[index] = new_node;\r\n}\r\n\r\n<span class=\"hljs-type\">int<\/span> <span class=\"hljs-title function_\">search<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">char<\/span>* key)<\/span> {\r\n    <span class=\"hljs-type\">int<\/span> index = hash_function(key);\r\n    Node* current = table[index];\r\n    <span class=\"hljs-keyword\">while<\/span> (current != <span class=\"hljs-literal\">NULL<\/span>) {\r\n        <span class=\"hljs-keyword\">if<\/span> (<span class=\"hljs-built_in\">strcmp<\/span>(current-&gt;key, key) == <span class=\"hljs-number\">0<\/span>) {\r\n            <span class=\"hljs-keyword\">return<\/span> current-&gt;value;\r\n        }\r\n        current = current-&gt;next;\r\n    }\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">-1<\/span>; <span class=\"hljs-comment\">\/\/ key not found<\/span>\r\n}\r\n\r\n<span class=\"hljs-type\">void<\/span> <span class=\"hljs-title function_\">delete<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">char<\/span>* key)<\/span> {\r\n    <span class=\"hljs-type\">int<\/span> index = hash_function(key);\r\n    Node* current = table[index];\r\n    Node* prev = <span class=\"hljs-literal\">NULL<\/span>;\r\n    <span class=\"hljs-keyword\">while<\/span> (current != <span class=\"hljs-literal\">NULL<\/span>) {\r\n        <span class=\"hljs-keyword\">if<\/span> (<span class=\"hljs-built_in\">strcmp<\/span>(current-&gt;key, key) == <span class=\"hljs-number\">0<\/span>) {\r\n            <span class=\"hljs-keyword\">if<\/span> (prev == <span class=\"hljs-literal\">NULL<\/span>) {\r\n                table[index] = current-&gt;next;\r\n            } <span class=\"hljs-keyword\">else<\/span> {\r\n                prev-&gt;next = current-&gt;next;\r\n            }\r\n            <span class=\"hljs-built_in\">free<\/span>(current);\r\n            <span class=\"hljs-keyword\">return<\/span>;\r\n        }\r\n        prev = current;\r\n        current = current-&gt;next;\r\n    }\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    insert(<span class=\"hljs-string\">\"apple\"<\/span>, <span class=\"hljs-number\">5<\/span>);\r\n    insert(<span class=\"hljs-string\">\"banana\"<\/span>, <span class=\"hljs-number\">10<\/span>);\r\n    \r\n    <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"Value of apple: %d\\n\"<\/span>, search(<span class=\"hljs-string\">\"apple\"<\/span>));\r\n    <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"Value of banana: %d\\n\"<\/span>, search(<span class=\"hljs-string\">\"banana\"<\/span>));\r\n    \r\n    delete(<span class=\"hljs-string\">\"apple\"<\/span>);\r\n    \r\n    <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"Value of apple after deletion: %d\\n\"<\/span>, search(<span class=\"hljs-string\">\"apple\"<\/span>));\r\n    \r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>;\r\n}\r\n<\/code><\/pre>\n<p>The above code implements a simple hash table, including insert, search, and delete operations. In this example, the hash function calculates the hash value using the sum of the ASCII codes of the characters, and handles collisions using linked lists. You can modify and expand this example according to your own needs.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The basic steps to implementing a hash table are as follows: Definition of the data structure of a hash table including the size of the hash table, the number of buckets, and the structure of the buckets. Implement a hash function: mapping keys to bucket indices. Implementing functions for hash table operations, such as insertion, [&hellip;]<\/p>\n","protected":false},"author":6,"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-9991","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 implement a hash table using 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-implement-a-hash-table-using-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 implement a hash table using the C language?\" \/>\n<meta property=\"og:description\" content=\"The basic steps to implementing a hash table are as follows: Definition of the data structure of a hash table including the size of the hash table, the number of buckets, and the structure of the buckets. 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