{"id":1944,"date":"2020-04-08T11:23:49","date_gmt":"2020-04-08T11:23:49","guid":{"rendered":"https:\/\/golangbyexamples.com\/?p=1944"},"modified":"2020-04-08T11:23:59","modified_gmt":"2020-04-08T11:23:59","slug":"random-number-range-golang","status":"publish","type":"post","link":"https:\/\/golangbyexamples.com\/random-number-range-golang\/","title":{"rendered":"Generate a number in a given range in Go (Golang)"},"content":{"rendered":"\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_17 counter-hierarchy counter-decimal ez-toc-light-blue\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" style=\"display: none;\"><i class=\"ez-toc-glyphicon ez-toc-icon-toggle\"><\/i><\/a><\/span><\/div>\n<nav><ul class=\"ez-toc-list ez-toc-list-level-1\"><li class=\"ez-toc-page-1 ez-toc-heading-level-1\"><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/golangbyexamples.com\/random-number-range-golang\/#Overview\" title=\"Overview\">Overview<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-1\"><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/golangbyexamples.com\/random-number-range-golang\/#Code\" title=\"Code\">Code<\/a><\/li><\/ul><\/nav><\/div>\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Overview\"><\/span><strong>Overview<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p class=\"has-medium-font-size\"><strong>&#8216;mat\/rand&#8217; <\/strong>package of golang contains a <strong>Intn<\/strong> function that can be used to generate a random number between [0,n). Bracket at the end means that n is exclusive.<\/p>\n\n\n\n<p class=\"has-medium-font-size\">To know more about what pseudo-random number means, checkout this post &#8211; <a href=\"https:\/\/golangbyexamples.com\/generate-random-number-golang\">https:\/\/golangbyexamples.com\/generate-random-number-golang<\/a><\/p>\n\n\n\n<p class=\"has-medium-font-size\">Below is the signature of this method. It takes input a number n and will return a number x in range 0&lt;=x&lt;n.<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">func Intn(n int) int<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\"><br>Above function can also be used to generate a random number in range a to b too. See below program. It is used to generate a number between range a to b. We are also providing a seed value to the <strong>rand<\/strong> so that it generates different output everytime.<br><\/p>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Code\"><\/span><strong>Code<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">package main\n\nimport (\n    \"fmt\"\n    \"math\/rand\"\n    \"time\"\n)\n\nfunc main() {\n    rand.Seed(time.Now().Unix())\n\n    \/\/Generate a random number x where x is in range 5<=x<=20\n    rangeLower := 5\n    rangeUpper := 20\n    randomNum := rangeLower + rand.Intn(rangeUpper-rangeLower+1)\n    fmt.Println(randomNum)\n\n    \/\/Generate a random number x where x is in range 100<=x<=200\n    rangeLower = 100\n    rangeUpper = 200\n    randomNum = rangeLower + rand.Intn(rangeUpper-rangeLower+1)\n    fmt.Println(randomNum)\n}<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Output:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">Number between 5<=x<=20\nNumber between 100<=x<=200<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Table of Contents OverviewCode Overview &#8216;mat\/rand&#8217; package of golang contains a Intn function that can be used to generate a random number between [0,n). Bracket at the end means that n is&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","footnotes":"","jetpack_publicize_message":"","jetpack_is_tweetstorm":false},"categories":[1],"tags":[3,4,248],"class_list":["post-1944","post","type-post","status-publish","format-standard","hentry","category-tech","tag-go","tag-golang","tag-random"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Generate a number in a given range in Go (Golang) - Welcome To Golang By Example<\/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:\/\/golangbyexamples.com\/random-number-range-golang\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Generate a number in a given range in Go (Golang) - Welcome To Golang By Example\" \/>\n<meta property=\"og:description\" content=\"Table of Contents OverviewCode Overview &#8216;mat\/rand&#8217; package of golang contains a Intn function that can be used to generate a random number between [0,n). 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