{"id":27556,"date":"2022-12-25T03:34:57","date_gmt":"2022-12-24T22:04:57","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-random-generation-of-numbers-closed\/"},"modified":"2022-12-25T03:34:57","modified_gmt":"2022-12-24T22:04:57","slug":"solved-random-generation-of-numbers-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-random-generation-of-numbers-closed\/","title":{"rendered":"[Solved] Random generation of numbers? [closed]"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-16143324\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"16143324\" data-parentid=\"16142785\" data-score=\"0\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>Edit: Original supposition on the problem completely wrong. The cause of you getting all zeros is that the <code>state<\/code> is not seeded. You need to fill <code>state<\/code> with something &#8216;random&#8217;.<\/p>\n<p>This code work. Note that the function <code>seed()<\/code> is in absolutely no way scientifically proven to be good &#8211; in fact, I just made it up as I went along, trying to get as much &#8220;bits&#8221; as possible varying as much as possible in the seed. You should do some research on &#8220;seeding random numbers&#8221;. (I also tried seeding with just <code>state[i] = i;<\/code>, and that also seems to work fairly well, but you get quite similar numbers in the first couple of iterations). <\/p>\n<pre><code>#include &lt;iostream&gt;\n#include &lt;cstdint&gt;\n\n\/* initialize state to random bits *\/\nstatic uint32_t state[16];\n\/* init should also reset this to 0 *\/\nstatic unsigned int index = 0;\n\/* return 32 bit random number *\/\nuint32_t WELLRNG512(void)\n{\n    uint32_t a, b, c, d;\n    a = state[index];\n    c = state[(index+13)&amp;15];\n    b = a^c^(a&lt;&lt;16)^(c&lt;&lt;15);\n    c = state[(index+9)&amp;15];\n    c ^= (c&gt;&gt;11);\n    a = state[index] = b^c;\n    d = a^((a&lt;&lt;5)&amp;0xDA442D24UL);\n\n    index = (index + 15)&amp;15;\n    a = state[index];\n    state[index] = a^b^d^(a&lt;&lt;2)^(b&lt;&lt;18)^(c&lt;&lt;28);\n    return state[index];\n}\n\nvoid seed()\n{\n    for(size_t i = 0; i &lt; sizeof(state)\/sizeof(state[0]); i++)\n    {\n    state[i] = (i &lt;&lt; (24 + (i &amp; 5))) ^ (i &lt;&lt; 7) ^ (i &lt;&lt; 6) ^ (i &gt;&gt; 2);\n    }\n}    \n\nint main()\n{\n    using namespace std;\n    seed();\n    for(int i = 0; i &lt; 50; i++)\n    {\n    cout &lt;&lt; WELLRNG512() &lt;&lt; endl;\n    }\n    return 0;\n}\n<\/code><\/pre>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">1<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Random generation of numbers? [closed] <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] Edit: Original supposition on the problem completely wrong. The cause of you getting all zeros is that the state is not seeded. You need to fill state with something &#8216;random&#8217;. This code work. Note that the function seed() is in absolutely no way scientifically proven to be good &#8211; in fact, I just made &#8230; <a title=\"[Solved] Random generation of numbers? [closed]\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-random-generation-of-numbers-closed\/\" aria-label=\"More on [Solved] Random generation of numbers? [closed]\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[457,324,1014],"class_list":["post-27556","post","type-post","status-publish","format-standard","hentry","category-solved","tag-algorithm","tag-c","tag-random"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Random generation of numbers? 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