{"id":351809,"date":"2021-02-04T09:15:42","date_gmt":"2021-02-04T01:15:42","guid":{"rendered":"http:\/\/4563.org\/?p=351809"},"modified":"2021-02-04T09:15:42","modified_gmt":"2021-02-04T01:15:42","slug":"%e4%b8%80%e4%b8%aa%e5%85%b3%e4%ba%8e%e6%95%b0%e5%80%bc%e8%ae%a1%e7%ae%97%e7%9a%84%e5%a5%87%e6%80%aa%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=351809","title":{"rendered":"\u4e00\u4e2a\u5173\u4e8e\u6570\u503c\u8ba1\u7b97\u7684\u5947\u602a\u95ee\u9898"},"content":{"rendered":"
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\u4e00\u4e2a\u5173\u4e8e\u6570\u503c\u8ba1\u7b97\u7684\u5947\u602a\u95ee\u9898 <\/h1>\n

<\/p>\n

\n
\u8cc7\u6df1\u5927\u4f6c : evil4 <\/span> <\/i> 1<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
\u4eca\u5929\u5728\u5904\u7406\u4e00\u4e2a BUG \u7684\u65f6\u5019\uff0c\u53d1\u73b0\u4e86\u4e00\u4e2a\u5f88\u5947\u602a\u7684\u95ee\u9898\uff0c\u5199\u51fa\u6765\u8ba9\u5927\u5bb6\u53c2\u89c2\u4e00\u4e0b\uff0c\u53ef\u80fd\u5927\u5bb6\u4e5f\u78b0\u5230\u8fc7\u7c7b\u4f3c\u95ee\u9898\uff0c\u53ef\u4ee5\u8ba8\u8bba\u4e00\u4e0b\u89e3\u51b3\u65b9\u6cd5\u4ee5\u907f\u514d\u540e\u6765\u7684\u540c\u5b66\u8e29\u5751\u3002<\/p>\n

\u95ee\u9898\u5982\u4e0b\uff1a
intval(157.2*100)<\/p>\n

\u6211\u4eec\u76f4\u89c2\u770b\u7684\u8bdd\u5e94\u8be5\u89c9\u5f97\u8f93\u51fa 15720\uff0c\u4f46\u662f\u4ed6\u5b9e\u9645\u8f93\u51fa\u662f 15719<\/p>\n

\u6211\u5206\u522b\u8f93\u51fa 157.2 * 100\uff0c \u7ed3\u679c 15720
\u7136\u540e intval(15720) \u7ed3\u679c 15720<\/p>\n

\u4f46\u662f\u4e3a\u4ec0\u4e48\u4e0a\u9762\u8fd9\u4e2a\u5c31\u4f1a\u8f93\u51fa 15719 \u5462\uff1f\u6709\u9ad8\u624b\u6307\u70b9\u4e00\u4e0b\u5417\uff1f <\/p><\/div>\n

\u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (9<\/span>) <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n
    \n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : carity <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u6d6e\u70b9\u7cbe\u5ea6\u95ee\u9898 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : fengpan567 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u8f6c\u6210\u6574\u6570\u8fdb\u884c\u8ba1\u7b97 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : joesonw <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u53c2\u8003\u8d44\u6599 https:\/\/en.wikipedia.org\/wiki\/IEEE_754 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : eastphoton <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u65e5\u7ecf\u4e86\u3002\u5341\u8fdb\u5236\u4e0b\u7684\u6709\u9650\u5c0f\u6570\u53ef\u80fd\u662f\u4e8c\u8fdb\u5236\u4e0b\u7684\u65e0\u9650\u5faa\u73af\u5c0f\u6570\uff0c\u5b58\u4e0d\u4e86\u3002<\/p>\n

    0.2D=0.00110011B \u65e0\u9650\u5faa\u73af\uff0c\u4ece\u6d6e\u70b9\u53ef\u5b58\u50a8\u4f4d\u6570\u622a\u65ad\u540e\u53d8\u6210 0.19xxx<\/p>\n

    \u4e0d\u5141\u8bb8\u8bef\u5dee\u4e0d\u8981\u7528\u6d6e\u70b9\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n

  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : mrgeneral <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    > \u4ee5\u5341\u8fdb\u5236\u80fd\u591f\u7cbe\u786e\u8868\u793a\u7684\u6709\u7406\u6570\u5982 0.1 \u6216 0.7\uff0c\u65e0\u8bba\u6709\u591a\u5c11\u5c3e\u6570\u90fd\u4e0d\u80fd\u88ab\u5185\u90e8\u6240\u4f7f\u7528\u7684\u4e8c\u8fdb\u5236\u7cbe\u786e\u8868\u793a\uff0c\u56e0\u6b64\u4e0d\u80fd\u5728\u4e0d\u4e22\u5931\u4e00\u70b9\u70b9\u7cbe\u5ea6\u7684\u60c5\u51b5\u4e0b\u8f6c\u6362\u4e3a\u4e8c\u8fdb\u5236\u7684\u683c\u5f0f\u3002\u8fd9\u5c31\u4f1a\u9020\u6210\u6df7\u4e71\u7684\u7ed3\u679c\uff1a\u4f8b\u5982\uff0cfloor((0.1+0.7)*10) \u901a\u5e38\u4f1a\u8fd4\u56de 7 \u800c\u4e0d\u662f\u9884\u671f\u4e2d\u7684 8\uff0c\u56e0\u4e3a\u8be5\u7ed3\u679c\u5185\u90e8\u7684\u8868\u793a\u5176\u5b9e\u662f\u7c7b\u4f3c 7.9999999999999991118…\u3002<\/p>\n

    \u5982\u679c\u786e\u5b9e\u9700\u8981\u66f4\u9ad8\u7684\u7cbe\u5ea6\uff0c\u5e94\u8be5\u4f7f\u7528 BC \u6216\u8005 GMP \u3002 <\/p><\/div>\n<\/p><\/div>\n<\/li>\n

  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : debuggerx <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    round() <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : zhengwenk <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    var_dump(157.2 * 100)
    float(15720)<\/p>\n

    157.2*100 === 15720
    false <\/div>\n<\/p><\/div>\n<\/li>\n

  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : Jooooooooo <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u6709\u4e9b\u5341\u8fdb\u5236\u770b\u8d77\u6765\u53ef\u4ee5\u8868\u8fbe, \u5176\u5b9e\u4e8c\u8fdb\u5236\u8868\u8fbe\u4e0d\u4e86. <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : faqqcn <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u6362\u6210 BC Math \u65b9\u6cd5\u3002
    bcmul(‘157.2’,100,0) <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n","protected":false},"excerpt":{"rendered":"

    \u4e00\u4e2a\u5173\u4e8e\u6570\u503c\u8ba1\u7b97\u7684\u5947\u602a\u95ee\u9898 \u8cc7\u6df1\u5927…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/351809"}],"collection":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=351809"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/351809\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=351809"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=351809"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=351809"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}