{"id":162911,"date":"2020-10-02T11:49:51","date_gmt":"2020-10-02T03:49:51","guid":{"rendered":"http:\/\/4563.org\/?p=162911"},"modified":"2020-10-02T11:49:51","modified_gmt":"2020-10-02T03:49:51","slug":"%e9%82%a3%e4%ba%9b%e8%83%bd%e6%89%8b%e5%86%99%e5%90%84%e7%a7%8d%e6%8e%92%e5%ba%8f%e7%9a%84%e4%ba%ba%e8%83%bd%e6%89%8b%e5%86%99%e6%95%b0%e7%9a%84%e8%a1%a5%e7%a0%81%e5%90%97%ef%bc%9f%e6%af%94%e5%a6%82","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=162911","title":{"rendered":"\u90a3\u4e9b\u80fd\u624b\u5199\u5404\u79cd\u6392\u5e8f\u7684\u4eba\u80fd\u624b\u5199\u6570\u7684\u8865\u7801\u5417\uff1f\u6bd4\u5982 -1.234 \u7684\u8865\u7801\u3002"},"content":{"rendered":"
\n
\n
\n

\u90a3\u4e9b\u80fd\u624b\u5199\u5404\u79cd\u6392\u5e8f\u7684\u4eba\u80fd\u624b\u5199\u6570\u7684\u8865\u7801\u5417\uff1f\u6bd4\u5982 -1.234 \u7684\u8865\u7801\u3002 <\/h1>\n

<\/p>\n

\n
\u8cc7\u6df1\u5927\u4f6c : m30102 <\/span> <\/i> 5<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
\u8fd9\u662f\u4e00\u56de\u4e8b\u513f\u5417\uff1f <\/div>\n

<\/p>\n

\u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (22<\/span>) <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n
    \n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : whileFalse <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @whileFalse \u90fd\u662f\u57fa\u7840\u554a <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : m30102 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u6d6e\u70b9\u6570\u54ea\u6765\u7684\u8865\u7801\uff1f\u4e3b\u6c34\u5e73\u582a\u5fe7\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : keith1126 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u9493\u9c7c\u4e5f\u4e0d\u7528\u8fd9\u6837\u9493\u554a~ <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : yogogo <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u4e0d\u80fd\u7528\u9488\u5728\u5149\u76d8\u4e0a\u6233\u4e2a linux \u5185\u6838\u51fa\u6765\u7684\uff0c\u4e00\u5f8b\u8ba4\u5b9a\u4e3a\u57fa\u7840\u4e0d\u884c\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : luckyrayyy <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @keith1126 \u4e0d\u5e26\u6211\u5b9a\u70b9\u5c0f\u6570\u73a9\u4e86\uff1f <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : m30102 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u4e3b\u662f\u4e0d\u662f\u88ab\u55b7\u8fc7\u554a\uff1f\u62a5\u590d\u6027\u63d0\u95ee\uff1f <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : bnrwnjyw <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u6211\u6765\u95ee\u4e2a\u57fa\u7840\uff0c\u4f60\u662f\u8c01\uff1f <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : mazyi <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u4f60\u4ece\u54ea\u6765?\u8981\u5230\u54ea\u53bb? <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : yazinnnn <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u6211\u4eec\u5b66\u8fd9\u4e9b\u4e1c\u897f\uff0c\u4e0d\u662f\u505a\u4e00\u4e2a\u4ec0\u4e48\u90fd\u7eaf\u7684\u786c\u76d8\uff0c\u800c\u662f\u7eaf\u5b83\u4eec\u7684\u7f13\u5b58\uff0c\u6709\u4e00\u4e2a\u5feb\u901f\u7684\u7d22\u5f15\u3002<\/p>\n

    \u5c31\u4f60\u4e3e\u7684\u8fd9\u4e2a\u4f8b\u5b50\uff0c\u9664\u4e86\u90a3\u4e9b\u8981\u8003\u8bd5\uff0c\u8981\u9762\u8bd5\u7684\uff0c\u6216\u8005\u6253\u7ade\u8d5b\u7684\u4eba\uff0c\u6ca1\u6709\u4eba\u5929\u5929\u53bb\u5237\u4ec0\u4e48\u6392\u5e8f\u7684\u54ea\u4e00\u6b65\u662f\u600e\u4e48\u6837\u7684\u3002\u4f46\u662f\u4f60\u4e00\u8bf4\u6392\u5e8f\uff0c\u6211\u4eec\u5c31\u77e5\u9053\u6392\u5e8f\u662f\u4ec0\u4e48\u4e1c\u897f\uff0c\u5927\u6982\u6709\u54ea\u4e9b\u6392\u5e8f\uff0c\u4ed6\u4eec\u7684\u539f\u7406\u5927\u6982\u662f\u600e\u4e48\u6837\u7684\uff0c\u4ed6\u4eec\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u662f\u600e\u4e48\u6837\u7684\uff0c\u5728\u67d0\u4e2a\u573a\u666f\u65f6\uff0c\u6211\u4eec\u4e5f\u80fd\u53bb\u5206\u6790\u7528\u4ec0\u4e48\u7b97\u6cd5\uff0c\u800c\u4e0d\u662f\u9a6c\u4e0a\u6253\u5f00 IDE \u5c31\u5f00\u59cb\u5199\u4ee3\u7801\uff0c\u8fd9\u79cd\u60c5\u51b5\u5728\u5de5\u7a0b\u4e2d\u51e0\u4e4e\u4e0d\u53ef\u80fd\u5b58\u5728\uff0c\u8981\u5199\u6211\u4eec\u4e5f\u4f1a\u7f51\u4e0a\u67e5\uff0c\u53bb\u7b14\u8bb0\u4e2d\u627e\u3002<\/p>\n

    \u4ec0\u4e48\u8865\u7801\u5c31\u66f4\u662f\u5982\u6b64\uff0c\u6211\u4eec\u5b66\u8fd9\u4e2a\u4e0d\u662f\u8ba9\u4f60\u62ff\u4e2a\u6570\u5b57\u5c31\u80fd\u5f00\u59cb\u7b97\uff0c\u800c\u662f\u77e5\u9053\uff0c\u8865\u7801\u662f\u4e2a\u4ec0\u4e48\u4e1c\u897f\uff1f\u5b83\u7528\u5728\u4ec0\u4e48\u5730\u65b9\uff0c\u4e3a\u4ec0\u4e48\u8981\u6709\u8fd9\u4e2a\u4e1c\u897f\uff1f\u5b83\u5927\u6982\u662f\u4e2a\u4ec0\u4e48\u601d\u8def\uff1f\u8bf8\u5982\u6b64\u7c7b\u3002 <\/p><\/div>\n<\/p><\/div>\n<\/li>\n

  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : raaaaaar <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @keith1126 \u6211\u8bb0\u5f97\u8bfe\u672c\u4e0a\u6559\u7684\u662f IEEE754 \u6807\u51c6\uff0c\u5206\u4e3a\u5e95\u6570\u548c\u57fa\u6570\uff0c\u597d\u50cf\u4e24\u8005\u4e2d\u786e\u5b9e\u6709\u4e00\u4e2a\u7528\u8865\u7801\u8868\u793a\u7684 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : yuruizhe <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u80fd\u7528\u52fa\u5b50\u5403\u7c73\u996d\u7684\u4eba\uff0c\u80fd\u7cbe\u786e\u7684\u77e5\u9053\u6bcf\u4e00\u52fa\u5b50\u6709\u591a\u5c11\u7c73\u996d\u7c92\u5417\uff1f <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : shilyx <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @raaaaaar \u662f\u554a\uff0c\u4f46\u9762\u8bd5\u6ca1\u7b54\u51fa\u6765\u5c31\u7b97\u4e0d\u4f1a\uff0c\u7b54\u51fa\u6765\u4e86 \u8fc7\u6bb5\u65f6\u95f4\u53c8\u5fd8\uff0c\u8fd9\u6837\u4e0d\u662f\u778e\u6298\u817e\u4e48\uff1f <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : m30102 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u5047\u8bbe\u4e3b\u4e0d\u662f\u6765\u9493\u9c7c\u7684\u5427\u3002\u3002
    \u6d6e\u70b9\u6570\u4e00\u822c\u662f\u6309 IEEE 754 \u4e8c\u8fdb\u5236\u6765\u8868\u793a\u7684\uff0c\u6ca1\u6709\u4ec0\u4e48\u8865\u7801\u7684\u6982\u5ff5\uff0c\u6b63\u8d1f\u5c31\u662f\u6700\u9ad8\u4f4d\u7684 1bit \u3002
    \u81f3\u4e8e\u5c06\u5b57\u7b26\u4e32\u89e3\u6790\u4e3a IEEE 754 \u4e8c\u8fdb\u5236\uff0c\u4e0d\u7528\u8bf4\u624b\u5199\u4e86\uff0c\u7528\u4ee3\u7801\u8f6c\u6362\u90fd\u590d\u6742\u5f97\u5f88\uff0cjava \u3001php \u3001glibc \u751a\u81f3\u7f16\u8bd1\u5668\u90fd\u6709\u8fc7\u5404\u79cd bug\uff1a https:\/\/www.exploringbinary.com\/topics\/#correctly-rounded-decimal-to-floating-point<\/p>\n

    \u60f3\u4e86\u89e3\u7684\u8bdd\u53ef\u4ee5\u770b\u4e00\u4e0b\u8fd9\u4e2a\u7b97\u6cd5\uff1a https:\/\/www.ampl.com\/netlib\/fp\/dtoa.c \u82f9\u679c\u7684 iOS macOS \u7528\u7684\u5c31\u662f\u8fd9\u4efd\u4ee3\u7801\u3002<\/p>\n

    \u5177\u4f53\u5230 1.234 \u8fd9\u4e2a\u6570\uff0c\u5982\u679c\u7528\u624b\u7b97\u7684\u8bdd\uff0c\u5c31\u662f 1234 \/ 1000\uff0c\u8f6c\u6362\u4e3a\u4e8c\u8fdb\u5236\uff0c\u518d\u8fdb\u884c\u5927\u6574\u6570\u8ba1\u7b97\uff0c\u5f97\u5230\u7684\u662f\u4e00\u4e2a\u65e0\u9650\u957f\u5ea6\u7684\u4e8c\u8fdb\u5236\u5c0f\u6570\uff1a
    1.001110111110011101101100100010110100001110010101100000010000011000100100110111010010111100011010100111111011111001110110…<\/p>\n

    \u8fd9\u91cc 54 bit \u662f 0\uff0c\u5219\u5411\u4e0b\u820d\u5165\uff0c\u5f97\u5230\u4e8c\u8fdb\u5236\uff1a
    1.0011101111100111011011001000101101000011100101011<\/p>\n

    \u8f6c\u6362\u4e3a IEEE 754 \u8868\u793a\uff0c\u6700\u9ad8\u4f4d 1 \u8868\u793a\u8d1f\u6570\uff0c\u540e\u9762 11 \u4f4d\u662f exp 0\uff0c\u52a0\u4e0a 1023 bias \u5c31\u662f 01111111111\uff0c
    \u6700\u540e 52 \u4f4d\u5c31\u662f\u4e0a\u9762\u7684\u4e8c\u8fdb\u5236\uff0c\u9690\u85cf\u9ad8\u4f4d 1\uff0c\u5408\u8d77\u6765\u5c31\u662f\uff1a
    1 01111111111 0011101111100111011011001000101101000011100101011000<\/p>\n

    \u7528 hex \u8868\u793a\u5c31\u662f
    0xbff3be76c8b43958<\/p>\n

    \u6211\u4eec\u53ef\u4ee5\u518d\u5b9e\u9645\u9a8c\u8bc1\u4e00\u4e0b\uff1a
    uint64_t p = 0xbff3be76c8b43958ull;
    double d = *(double *)&p;
    printf(“%.17gn”, d); <\/div>\n<\/p><\/div>\n<\/li>\n

  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : icyalala <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u61c2\u5f97\u90fd\u61c2 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : IsaacYoung <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @icyalala \u611f\u8c22 V \u7ad9\u8f83\u771f\u5927\u795e <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : m30102 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u5404\u79cd\u6392\u5e8f\u6211\u80fd\u624b\u5199\uff0c\u8865\u7801\u8fd9\u79cd\u65e9\u5fd8\u4e86\u3002\u4e24\u4ef6\u4e8b\u53c8\u6ca1\u5565\u5173\u8054\uff0c\u80fd\u624b\u5199\u6392\u5e8f\u4e5f\u4e0d\u662f\u80fd\u529b\u591a\u5f3a\uff0c\u53ea\u662f\u5e73\u5e38\u4f1a\u7ecf\u5e38\u5237\u7b97\u6cd5\u9898\uff0c\u539f\u53cd\u8865\u7801\u8fd9\u79cd\u4e0d\u7ecf\u5e38\u770b\u5fd8\u8bb0\u5f88\u6b63\u5e38\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : gadsavesme <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u7528\u8fd9\u79cd\u65b9\u5f0f\u63d0\u95ee\u7684, \u80af\u5b9a\u90fd\u539f\u56e0, \u4e0d\u77e5\u9053\u4e3b\u662f\u8fa9\u8bba\u8fd8\u662f\u9762\u8bd5\u7684\u65f6\u5019\u53d7\u632b\u4e86. <\/p>\n

    \u4e0d\u62ac\u6760\u7684\u8bdd, \u6392\u5e8f\u5176\u5b9e\u662f\u975e\u5e38\u597d\u7684\u95ee\u9898, \u8003\u5bdf\u91cd\u70b9\u4e5f\u4e0d\u53ea\u662f\u57fa\u7840\u7f16\u7a0b\u80fd\u529b, \u800c\u662f\u4f18\u5316\u4ee3\u7801\u7684\u80fd\u529b, \u4e00\u4e2a\u597d\u7684\u9762\u8bd5\u5b98\u4f1a\u4e0d\u4f1a\u8ba9\u4f60\u5199\u5404\u79cd\u6392\u5e8f, \u800c\u662f\u8ba9\u4f60\u9009\u62e9\u4e00\u79cd\u4f60\u6392\u5e8f\u6765\u5199\u5e76\u4e14\u8bf4\u660e\u4e3a\u4ec0\u4e48\u9009\u8fd9\u4e2a, \u5199\u5b8c\u4e86\u518d\u5f15\u5bfc\u4f60\u8fdb\u884c\u4f18\u5316, \u968f\u4fbf\u8fd8\u80fd\u770b\u770b\u4f60\u7684\u4ee3\u7801\u8d28\u91cf. \u5f88\u591a\u4eba\u4e4b\u6240\u4ee5\u53cd\u611f\u6392\u5e8f\u662f\u56e0\u4e3a\u5f88\u591a\u9762\u8bd5\u5b98\u7684\u6c34\u5e73\u4e0d\u591f, \u5e76\u4e0d\u662f\u5199\u4e2a\u6392\u5e8f\u672c\u8eab\u6709\u4ec0\u4e48\u95ee\u9898. <\/p><\/div>\n<\/p><\/div>\n<\/li>\n

  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : coderluan <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    CSAPP \u7b2c\u4e8c\u7ae0 \u7b2c\u4e8c\u8282 \u6709\u8bb2\u8865\u7801\u3002\u7ed3\u5408\u524d\u9762\u8bb2\u7684\u4e8c\u8fdb\u5236\uff0c\u5341\u516d\u8fdb\u5236\u548c\u5341\u8fdb\u5236\u7684\u8f6c\u6362\u65b9\u6cd5\u3002\u7ed9\u5b9a\u4e00\u4e2a\u6570\u636e\u7c7b\u578b\u4ee5\u53ca\u503c\uff0c\u6bd4\u5982 char \u7c7b\u578b\uff08 8 \u4f4d\uff09\uff0c\u503c -90\uff0c\u5199\u8865\u7801\u662f\u5f88\u7b80\u5355\u7684\u4e8b\u60c5\uff0c\u6211\u89c9\u5f97\u5e94\u8be5\u8bb0\u4f4f\u3002\uff08\u6e29\u99a8\u63d0\u793a\uff1a\u9605\u8bfb\u65f6\u95f4\u5927\u6982 1 \u5c0f\u65f6\uff09<\/p>\n

    \u6211\u4e4b\u524d\u8bb0\u4e0d\u4f4f\u662f\u56e0\u4e3a\u6ca1\u6709\u63a5\u89e6\u5230\u8fd9\u4e2a\u516c\u5f0f\u548c\u4f53\u7cfb\uff0c\u770b\u7684\u90fd\u662f\u77e5\u4e4e\u7684\u4ec0\u4e48\u89e3\u91ca\uff0c\u73b0\u5728\u53d1\u73b0\u770b\u7684\u77e5\u4e4e\u90a3\u4e2a\u89e3\u91ca\u9002\u5408\u7406\u89e3\uff0c\u4f46\u4e0d\u9002\u5408\u8ba1\u7b97\u3002 <\/p><\/div>\n<\/p><\/div>\n<\/li>\n

  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : rebeccaMyKid <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u6d6e\u70b9\u6570\u8fd8\u6ca1\u770b\uff0c\u6211\u4e0a\u9762\u8bf4\u7684\u662f\u6574\u6570\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : rebeccaMyKid <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u5c31\u786c\u6760 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : shino996 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u8865\u7801\u5982\u679c\u77e5\u9053\u539f\u7406\u662f\u4e0d\u7528\u8bb0\u89c4\u5219\u7684\u3002
    \u6bd4\u5982\u4e00\u4e2a byte \u7c7b\u578b\u7684\u8d1f\u6570-5
    1. \u5148\u7528\u4e8c\u8fdb\u5236\u8868\u793a\u4ed6\u5bf9\u5e94\u7684\u6b63\u6570\uff1a0000 0101
    2. \u518d\u7528 0 \u51cf\u53bb\u8fd9\u4e2a\u6b63\u6570<\/p>\n

    “`
    0000 0000
    -0000 0101
    ————–
    1111 1011<\/p>\n

    “` <\/p><\/div>\n<\/p><\/div>\n<\/li>\n

  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : oaix <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @oaix \u5c0f\u6570\u8d70\u8d77\uff1f <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n","protected":false},"excerpt":{"rendered":"

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