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      "author": "steemitboard",
      "body": "Congratulations @walletang! You received a personal award!\n\n<table><tr><td>https://steemitimages.com/70x70/http://steemitboard.com/@walletang/birthday1.png</td><td>Happy Birthday! - You are on the Steem blockchain for 1 year!</td></tr></table>\n\n<sub>_You can view [your badges on your Steem Board](https://steemitboard.com/@walletang) and compare to others on the [Steem Ranking](http://steemitboard.com/ranking/index.php?name=walletang)_</sub>\n\n\n**Do not miss the last post from @steemitboard:**\n<table><tr><td><a href=\"https://steemit.com/carnival/@steemitboard/carnival-challenge-here-are-the-winners\"><img src=\"https://steemitimages.com/64x128/http://i.cubeupload.com/rltzHT.png\"></a></td><td><a href=\"https://steemit.com/carnival/@steemitboard/carnival-challenge-here-are-the-winners\">Carnival Challenge - Here are the winners</a></td></tr></table>\n\n###### [Vote for @Steemitboard as a witness](https://v2.steemconnect.com/sign/account-witness-vote?witness=steemitboard&approve=1) to get one more award and increased upvotes!",
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      "body": "<html>\n<p>Congratulations <a href=\"/@walletang\" target=\"_blank\">@walletang</a>, you have decided to take the next big step with your first post! The Steem Network Team wishes you a great time among this awesome community.</p>\n<hr>\n<div class=\"pull-left\"><img src=\"https://steemitimages.com/DQmaAdLUJ3yaSkmcmWECWyPGPWcjfbCoZ8Tu4RM6H4DbjCi/steem-network-thumbs-up.gif\" alt=\"Thumbs up for Steem Network´s strategy\" title=\"I suggest Steem Network´s strategy\" width=\"320\" height=\"222\"></div>\n<h1>The proven road to boost your personal success in this amazing Steem Network</h1>\n<p>Do you already know that awesome content will get great profits by following these <a href=\"https://steemit.com/steem-network/@steem-network/spread-your-posts-through-this-proven-strategy-and-get-great-profits-in-return--for-posts-created-at-2018-03-21\" target=\"_blank\" alt=\"Steem Network\" title=\"Follow Steem Network´s suggestions to boost your success\">simple steps</a> that have been worked out by experts?</p>\n</html>",
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      "body": "#### 大小端\n- 小端：把高位信息放到高字节上，低位信息放到低字节上\n- 大端：把高位信息放到低字节上，低位信息放到高字节上\n\n#### 计算机虚拟地址空间大小\n1个字长 = 4字节 = 32位\n每一位有1、0两种状态，所以一共是2的32次方种状态。\n也就是说，可以表示2的32次方个不同的数。\n2^32 = 4294967296 = 4194304 * 1024 = 4096 * 1024 * 1024 = 4 * 1G\n指针类型刚好是一个字长，所以指针能够表示4G内存空间的地址\n因此，32位机器的虚拟内存空间大小是4G\n\n#### 移位操作\n- 左移：高位截断，低位补0\n- 右移：\n   -  逻辑右移：高位补0，低位截断\n    - 算术右移：高位补最高位数字，低位截断\n- JAVA的右移：\n   -  逻辑右移：>>>\n    - 算术右移：>>\n\n如果需要移动K位大于等于被移动数的位数W，则先K mod W取余，再移位。\n\n#### 有符号数、无符号数\nC、C++都支持有符号数（默认）和无符号数，JAVA只支持有符号数\n\n#### 双射\n每个介于0~[(2^w)-1]的数都有唯一一个w位的值编码。反之亦然。\n\n#### 补码\n正数的补码等于它本身\n负数的补码等于数据位按位取反再加1\n（特例：最小的负数10000000，它的补码还是它本身。因为它已经是最小了，取反加1会产生下溢）\n二进制数的大小就是每一位的权相加。符号位的权需要加上符号。因此10000000就是最小的负数，因为符号位为负的权，负得最多，数据位没有正的数来抵消，因此是最小。同理，01111111就是最大的正数。\n\n#### 有符号数转换成无符号数\n正数不变，负数要变大，因为把首位的负权变成了正权，相当于增加了2^w。\n比如一个四位的正数\n-8（+2^4）    = 8U\n-3（+2^4）    = 13U\n-2（+2^4）    = 14U\n\n#### 无符号数转换成有符号数\n0~2^(w-1)-1的数不变，（二进制以0开头）\n其他数与上面相反，需要减去2^w （二进制以1开头）\n8U（-2^4）      = -8\n13U（-2^4）    = -3\n14U（-2^4）    = -2\n\n#### 有符号数与无符号数的运算\n在C语言中，如果有符号数与无符号数运算，会先都当成无符号数来运算。这样就可能负数不一定小于一个正数。",
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