{"id":14304,"date":"2024-03-15T08:52:27","date_gmt":"2024-03-15T08:52:27","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-generate-random-numbers-in-the-c-language\/"},"modified":"2025-08-06T06:53:18","modified_gmt":"2025-08-06T06:53:18","slug":"how-to-generate-random-numbers-in-the-c-language","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-generate-random-numbers-in-the-c-language\/","title":{"rendered":"C Random Numbers: Generate with rand()"},"content":{"rendered":"<p>In C language, you can use the standard library function rand() to generate random numbers. Below is a simple example demonstrating how to use rand() to generate a random number:<\/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;time.h&gt;<\/span><\/span>\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-type\">int<\/span> i, n;\r\n   <span class=\"hljs-comment\">\/\/ \u4f7f\u7528\u5f53\u524d\u65f6\u95f4\u4f5c\u4e3a\u968f\u673a\u6570\u79cd\u5b50<\/span>\r\n   srand(time(<span class=\"hljs-number\">0<\/span>));\r\n\r\n   <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"\u751f\u621010\u4e2a\u968f\u673a\u6570\uff1a\\n\"<\/span>);\r\n\r\n   <span class=\"hljs-comment\">\/\/ \u751f\u6210\u5e76\u6253\u537010\u4e2a\u968f\u673a\u6570<\/span>\r\n   <span class=\"hljs-keyword\">for<\/span> (i = <span class=\"hljs-number\">0<\/span>; i &lt; <span class=\"hljs-number\">10<\/span>; i++) {\r\n      n = rand();\r\n      <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"%d\\n\"<\/span>, n);\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>It is important to note that the rand() function generates a pseudo-random number, which will produce the same random number sequence every time the program runs. To avoid this, you can use the srand() function to set a different seed before using rand(). In the example above, by using the time(0) function to get the current time as the seed, you can ensure that a different random number sequence is generated each time the program is run.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In C language, you can use the standard library function rand() to generate random numbers. Below is a simple example demonstrating how to use rand() to generate a random number: #include &lt;stdio.h&gt; #include &lt;stdlib.h&gt; #include &lt;time.h&gt; int main() { int i, n; \/\/ \u4f7f\u7528\u5f53\u524d\u65f6\u95f4\u4f5c\u4e3a\u968f\u673a\u6570\u79cd\u5b50 srand(time(0)); printf(&#8220;\u751f\u621010\u4e2a\u968f\u673a\u6570\uff1a\\n&#8221;); \/\/ \u751f\u6210\u5e76\u6253\u537010\u4e2a\u968f\u673a\u6570 for (i = 0; i &lt; 10; [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[704,381,5033,7134,15959],"class_list":["post-14304","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-c-code-examples","tag-c-programming","tag-rand-function","tag-random-numbers","tag-srand-function"],"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>C Random Numbers: Generate with rand() - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn to generate random numbers in C using rand() and srand(). 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