{"id":193,"date":"2016-07-29T13:19:21","date_gmt":"2016-07-29T13:19:21","guid":{"rendered":""},"modified":"2016-07-29T13:19:21","modified_gmt":"2016-07-29T13:19:21","slug":"","status":"publish","type":"post","link":"http:\/\/weizn.net\/?p=193","title":{"rendered":"\u5173\u4e8e\u5927\u7aef\u548c\u5c0f\u7aef\u5b57\u8282\u987a\u5e8f\u7684\u542b\u4e49"},"content":{"rendered":"

\n\t    \u7b80\u5355\u6765\u8bf4\uff0c\u5728\u5185\u5b58\u4e2d\uff0c\u5185\u5b58\u5730\u5740<\/span>\u7531\u5de6\u5411\u53f3\u4f9d\u6b21\u589e\u9ad8\uff08\u5f53\u7136\u8fd9\u662f\u62bd\u8c61\u7684\uff09\uff0c\u800c\u5728\u4e00\u4e2a\u591a\u5b57\u8282\u7684\u6570\u636e\u4e2d\uff0c\u5927\u7aef\u5c31\u662f\u9ad8\u5730\u5740\u5b58\u653e\u9ad8\u4f4d\u7684\u6570\u636e\uff0c\u4e5f\u5c31\u662f\u9ad8\u8fdb\u5236\u90e8\u5206\u5b58\u653e\u5728\u9ad8\u5730\u5740\uff0c\u5e95\u8fdb\u5236\u90e8\u5206\u5b58\u653e\u5728\u5e95\u5730\u5740\uff0c\u800c\u5c0f\u7aef\u662f\u9ad8\u8fdb\u5236\u90e8\u5206\u7684\u6570\u636e\u5b58\u653e\u5728\u5e95\u5730\u5740\uff0c\u5e95\u8fdb\u5236\u90e8\u5206\u7684\u6570\u636e\u5b58\u653e\u5728\u9ad8\u5730\u5740\u3002\u4e0b\u9762\u8f6c\u8f7d\u7684\u6587\u7ae0\u56fe\u7247\u8bf4\u660e\u4e0d\u662f\u5f88\u4e25\u8c28\uff0c\u5bb9\u6613\u9020\u6210\u8bef\u5bfc\uff0c\u5927\u7aef\u4e0d\u662f\u6570\u5b57\u5927\u5c31\u5b58\u5728\u9ad8\u5730\u5740\uff0c\u4e00\u5b9a\u662f\u9ad8\u8fdb\u5236\u7684\u6570\u5b58\u5728\u9ad8\u5730\u5740\u4e2d\u3002<\/span>\n<\/p>\n

\n\t\u5982\u5728C\u4e2d\u6211\u4eec\u53ef\u4ee5\u770b\u770b\u5185\u5b58\u5206\u5e03\u60c5\u51b5\uff1a<\/span>\n<\/p>\n

\n\t <\/span>\n<\/p>\n

#include <stdio.h>\n#include <stdlib.h>\n\ntypedef struct\n{\n    int i;\n    short j;\n}test;\n\nint main()\n{\n    int i;\n    test t;\n\n    t.i = 100;\n    t.j = 12345;\n\n    for(i=0;i<sizeof(t);i++)\n    {\n        printf(\"%02x\",((char *)&t)[i]);\n    }\n\n}\n<\/pre>\n<\/p>\n
\n\t\n<\/p>\n
\n\tOutput:\n<\/p>\n
\n\t6400000039300000\n<\/p>\n
\n\t<\/span>    \u5f88\u660e\u663e\u7684\u53ef\u4ee5\u770b\u51fa\u4e2a\u4ebaPC\u7684CPU\u662f\u5c0f\u7aef\u5b57\u8282\u987a\u5e8f\uff0c\u5207\u8bb0\u4e0d\u80fd\u4f7f\u7528\u5982\u4e0b\u7684\u65b9\u5f0f\u67e5\u770b\u5b57\u8282\u987a\u5e8f\uff1a<\/span>\n<\/p>\n
int i = 100;\nprintf(\"%04x\",i);<\/pre>\n<\/p>\n
\n\t\n<\/p>\n
\n\t\n<\/p>\n
\n\tOutput:\n<\/p>\n
\n\t00000064\n<\/p>\n
\n\t    \u8fd9\u79cd\u8f93\u51fa\u5b57\u8282\u987a\u5e8f\u662f\u4e0d\u6b63\u786e\u7684\uff0c\u8fd9\u79cd\u8f93\u51fa\u65b9\u5f0f\u53ea\u662f\u5728\u5341\u516d\u8fdb\u5236\u524d\u9762\u8865\u4e860\u800c\u5df2\uff0c\u800c\u4e0d\u662f\u663e\u793a\u7684\u6570\u636e\u5728\u5185\u5b58\u4e2d\u7684\u771f\u5b9e\u5b58\u653e\u60c5\u51b5\u3002<\/span>\n<\/p>\n
\n\t    \u6b64\u5916\u8fd8\u8981\u6ce8\u610f\u7684\u662f\uff0c\u6211\u4eec\u5e38\u8bf4\u7684\u7f51\u7edc\u5b57\u8282\u987a\u5e8f\uff0c\u4e5f\u5c31\u662f\u6240\u8c13\u7684\u5927\u7aef\u5b57\u8282\u987a\u5e8f\uff0c\u5b83\u4e0d\u662f\u4ee3\u8868\u7f51\u7edc\u4e0a\u6240\u6709\u4f20\u8f93\u7684\u6570\u636e\u90fd\u662f\u8981\u6309\u7167\u8fd9\u79cd\u6570\u636e\u683c\u5f0f\u3002\u6211\u4eec\u77e5\u9053\uff0c\u5b57\u8282\u987a\u5e8f\u5176\u5b9e\u5c31\u662fCPU\u5728\u8fdb\u884c\u8ba1\u7b97\u65f6\u5bf9\u6570\u636e\u7684\u4e0d\u540c\u8981\u6c42\u65b9\u5f0f\uff0c\u800c\u7f51\u7edc\u4e0a\u7684\u8bbe\u5907\u4e0d\u662f\u8981\u5bf9\u6240\u6709\u6570\u636e\u8fdb\u884c\u8ba1\u7b97\uff0c\u5b83\u4eec\u53ea\u5904\u7406\u81ea\u5df1\u6240\u5173\u5fc3\u7684\uff0c\u6bd4\u5982\u534f\u8bae\u7684\u5934\u90e8\u4fe1\u606f\uff0c\u6240\u4ee5\u5bf9\u4e8e\u6709\u7684\u534f\u8bae\uff0c\u5176\u5934\u90e8\u67d0\u4e9b\u975e\u5355\u5b57\u8282\u7684\u5b57\u6bb5\u5fc5\u987b\u662f\u7f51\u7edc\u5b57\u8282\u987a\u5e8f\uff0c\u6bd4\u5982TCP\/IP\u3001ARP\u3001IKE\u4e4b\u7c7b\u7684\u534f\u8bae\uff0c\u5b83\u4eec\u534f\u8bae\u5934\u90e8\u4e2d\u7684\u4e00\u4e9bint\u6216short\u7c7b\u578b\u7684\u5b57\u6bb5\u9700\u8981\u5148\u8f6c\u6362\u4e3a\u7f51\u7edc\u5b57\u8282\u987a\u5e8f\u518d\u53d1\u9001\u5230\u7f51\u7edc\u4e0a\uff0c\u624d\u80fd\u88ab\u7f51\u7edc\u8bbe\u5907\u51c6\u786e\u5904\u7406\u3002
\n<\/span>\n<\/p>\n
\n\t    \u4e0b\u9762\u662f\u8f6c\u8f7d\u7684\u4e00\u7bc7\u6587\u7ae0\uff1a
\n<\/span>\n<\/p>\n
\n\t——————————————————————————————–<\/span>\n<\/p>\n
\n\t\u6216\u8bb8\u4f60\u66fe\u7ecf\u4ed4\u7ec6\u4e86\u89e3\u8fc7\u4ec0\u4e48\u662f\u5927\u7aef\u5c0f\u7aef\uff0c\u4e5f\u52a8\u624b\u7f16\u5199\u4e86\u6d4b\u8bd5\u624b\u5934\u4e0a\u7684\u673a\u5668\u4e0a\u662f\u5927\u7aef\u8fd8\u662f\u5c0f\u7aef\u7684\u7a0b\u5e8f\uff0c\u751a\u81f3\u8fd8\u7f16\u5199\u4e86\u5927\u7aef\u5c0f\u7aef\u8f6c\u6362\u7a0b\u5e8f\uff1b\u4f46\u8fc7\u4e86\u4e00\u6bb5\u65f6\u95f4\u4e4b\u540e\uff0c\u5f53\u4f60\u518d\u770b\u5230\u5927\u7aef\u548c\u5c0f\u7aef\u8fd9\u4e24\u4e2a\u5b57\u773c\uff0c\u4f60\u7684\u8111\u4e2d\u5f88\u5feb\u6d6e\u8d77\u4e86\u81ea\u5df1\u66fe\u7ecf\u505a\u8fc7\u7684\u5de5\u4f5c\uff0c\u5374\u603b\u662f\u60f3\u4e0d\u8d77\u7a76\u7adf\u54ea\u79cd\u662f\u5927\u7aef\u3001\u54ea\u79cd\u662f\u5c0f\u7aef\uff0c\u7136\u540e\u53c8\u53bb\u67e5\u4ee5\u524d\u5199\u7684\u8bb0\u5f55\uff1f\u66f4\u8ba9\u4eba\u4e0d\u5feb\u7684\u662f\uff0c\u8fd9\u79cd\u7ecf\u5386\u53cd\u53cd\u590d\u590d\uff0c\u8ba9\u4f60\u5341\u5206\u56f0\u6270\u3002\u5982\u679c\u4f60\u548c\u4ee5\u524d\u7684\u7b14\u8005\u4e00\u6837\uff0c\u6709\u8fc7\u8fd9\u79cd\u4e0d\u5feb\u7684\u7ecf\u5386\uff0c\u90a3\u4e48\u8fd9\u7bc7\u6587\u7ae0\u5e0c\u671b\u80fd\u5e2e\u4f60\u5f7b\u5e95\u89e3\u51b3\u8fd9\u4e2a\u82e6\u607c\uff0c\u8ba9\u4f60\u5f7b\u5e95\u8bb0\u4f4f\u5b83\u4eec\u3002<\/span>\n<\/p>\n
\n\t\u5982\u679c\u4f60\u5728\u5de5\u4f5c\u4e2d\u7ecf\u5e38\u4f7f\u7528\u5230\u5927\u7aef\u548c\u5c0f\u7aef\u4ee5\u81f3\u4e8e\u5bf9\u5b83\u4eec\u5341\u5206\u719f\u6089\uff0c\u6216\u8005\u4f60\u7684\u8bb0\u5fc6\u529b\u5728\u4fdd\u6301\u65f6\u95f4\u7684\u957f\u5ea6\u548c\u7cbe\u51c6\u5ea6\u4e0a\u90fd\u5341\u5206\u4f18\u79c0\uff0c\u4ee5\u81f3\u4e8e\u4e0d\u9700\u8981\u501f\u52a9\u5176\u4ed6\u7684\u65b9\u6cd5\uff0c\u90a3\u4e48\u8fd9\u7bc7\u6587\u7ae0\u4e0d\u9002\u5408\u4f60\u3002<\/span>\n<\/p>\n
\n\t\u5982\u679c\u4f60\u5728\u770b\u8fd9\u7bc7\u6587\u7ae0\u524d\u5b8c\u5168\u4e0d\u77e5\u9053\u4ec0\u4e48\u662f\u5927\u7aef\u548c\u5c0f\u7aef\uff0c\u90a3\u4e48\u53ef\u4ee5\u53c2\u8003\u672c\u6587\u7684\u9644\u5f55\u6216\u8005\u5176\u4ed6\u7684\u535a\u6587\uff0c\u76f8\u5173\u7684\u4ecb\u7ecd\u975e\u5e38\u4e4b\u591a\uff0c\u800c\u9644\u5f55\u63d0\u4f9b\u4e86\u4e00\u4e2a\u5f88\u5e38\u89c1\u89e3\u91ca\u548c\u4e00\u6bb5\u6d4b\u8bd5\u7a0b\u5e8f\uff0c\u7136\u540e\u518d\u6765\u770b\u6b63\u6587\u3002<\/span>\n<\/p>\n
\n\t\u4e3a\u4e86\u5e2e\u52a9\u8bb0\u5fc6\uff0c\u7406\u89e3\u662f\u5fc5\u8981\u7684\uff1b\u800c\u8bb0\u5fc6\u7684\u76ee\u7684\uff0c\u4e5f\u5c31\u662f<\/span>\u4e3a\u4ec0\u4e48\u8981\u8bb0\u4f4f\u5b83\uff0c\u662f\u66f4\u91cd\u8981\u7684\u3002\u6216\u8bb8\u4f60\u4f1a\u95ee\uff0c\u5148\u4e86\u89e3\u6982\u5ff5\uff0c\u7528\u7684\u65f6\u5019\u518d\u67e5\uff0c\u4e0d\u884c\u4e48\uff1f\u5176\u5b9e\u6211\u4e4b\u524d\u4e5f\u662f\u8fd9\u4e48\u8ba4\u4e3a\u7684\u3002\u5927\u7aef\u548c\u5c0f\u7aef\u8fd9\u4e24\u4e2a\u540d\u8bcd\uff0c\u4f60\u4f1a\u5728\u5f88\u591a\u6709\u5173\u7f51\u7edc\u7f16\u7a0b\u3001\u7cfb\u7edf\u8bbe\u8ba1\u3001\u751a\u81f3\u662f\u4ee3\u7801\u5199\u4f5c\u7684\u4e66\u4e0a\u770b\u5230\uff0c\u800c\u4e14\u5b83\u4e5f\u662f\u5f88\u591a\u516c\u53f8\u7684\u7b14\u8bd5\u9898\u3001\u9762\u8bd5\u9898\u70ed\u95e8\u5185\u5bb9\uff0c\u53ef\u89c1\u5b83\u5728\u4e00\u4e9b\u9886\u57df\u662f\u5f88\u5e38\u7528\u3002\u5982\u679c\u7b49\u5230\u4f60\u7528\u7684\u65f6\u5019\u518d\u67e5\uff0c\u4e00\u65b9\u9762\u8981\u964d\u4f4e\u4f60\u7684\u5de5\u4f5c\u6548\u7387\uff0c\u53e6\u4e00\u65b9\u9762\uff0c\u5e94\u8bd5\u7684\u65f6\u5019\u4e5f\u4e0d\u662f\u4f60\u60f3\u67e5\u5c31\u80fd\u67e5\u7684\uff1b\u5176\u5b9e\u6700\u4e3b\u8981\u7684\u662f\uff0c\u5728\u638c\u63e1\u89c4\u5f8b\u540e\uff0c\u8bb0\u4f4f\u5b83\u4eec\u5e76\u4e0d\u56f0\u96be\u3002<\/span>\n<\/p>\n
\n\t\u73b0\u5728\u5148\u6765\u7406\u89e3\u8fd9\u5bf9\u6982\u5ff5\uff0c\u5927\u7aef\u548c\u5c0f\u7aef\u8fd9\u4e24\u4e2a\u4ee4\u4eba\u8ff7\u60d1\u7684\u672f\u8bed\u7a76\u7adf\u662f\u5982\u4f55\u4ea7\u751f\u7684\uff1f\u300a\u7a0b\u5e8f\u8bbe\u8ba1\u5b9e\u8df5\u300b\u7b2c9\u7ae0\u4e2d\u63d0\u5230\uff0c\u201c\u5927\u7aef\u201d\u548c\u201c\u5c0f\u7aef\u201d\u53ef\u4ee5\u8ffd\u6eaf\u52301726\u5e74\u7684Jonathan Swift\u7684\u300a\u683c\u5217\u4f5b\u6e38\u8bb0\u300b\uff0c\u5176\u4e2d\u4e00\u7bc7\u8bb2\u5230\u6709\u4e24\u4e2a\u56fd\u5bb6\u56e0\u4e3a\u5403\u9e21\u86cb\u7a76\u7adf\u662f\u5148\u6253\u7834\u8f83\u5927\u7684\u4e00\u7aef\u8fd8\u662f\u5148\u6253\u7834\u8f83\u5c0f\u7684\u4e00\u7aef\u800c\u4e89\u6267\u4e0d\u4f11\uff0c\u751a\u81f3\u7206\u53d1\u4e86\u6218\u4e89\u30021981\u5e7410\u6708\uff0cDanny Cohen\u7684\u6587\u7ae0\u300a\u8bba\u5723\u6218\u4ee5\u53ca\u5bf9\u548c\u5e73\u7684\u7948\u7977\u300b\uff08On holy wars and a plea for peace\uff09\u5c06\u8fd9\u4e00\u5bf9\u8bcd\u8bed\u5f15\u5165\u4e86\u8ba1\u7b97\u673a\u754c\u3002\u8fd9\u4e48\u770b\u6765\uff0c\u6240\u8c13\u5927\u7aef\u548c\u5c0f\u7aef\uff0c\u4e5f\u5c31\u662fbig-endian\u548clittle-endian\uff0c\u5176\u5b9e\u662f\u4ece\u63cf\u8ff0\u9e21\u86cb\u7684\u90e8\u4f4d\u800c\u5f15\u7533\u5230\u8ba1\u7b97\u673a\u5730\u5740\u7684\u63cf\u8ff0\uff0c\u4e5f\u53ef\u4ee5\u8bf4\uff0c\u662f\u4ece\u4e00\u4e2a\u4fda\u8bed\u884d\u5316\u6765\u7684\u8ba1\u7b97\u673a\u672f\u8bed\u3002\u7a0d\u6709\u4e9b\u82f1\u8bed\u5e38\u8bc6\u7684\u4eba\u90fd\u4f1a\u77e5\u9053\uff0c\u5982\u679c\u5355\u9760\u5b57\u9762\u610f\u601d\u6765\u7406\u89e3\u4fda\u8bed\uff0c\u90a3\u662f\u5f88\u96be\u731c\u5230\u5b83\u7684\u6b63\u786e\u542b\u4e49\u7684\u3002\u5728\u8ba1\u7b97\u673a\u91cc\uff0c\u5bf9\u4e8e\u5730\u5740\u7684\u63cf\u8ff0\uff0c\u5f88\u5c11\u7528\u201c\u5927\u201d\u548c\u201c\u5c0f\u201d\u6765\u5f62\u5bb9\uff1b\u5bf9\u5e94\u5730\uff0c\u7528\u7684\u66f4\u591a\u7684\u662f\u201c\u9ad8\u201d\u548c\u201c\u4f4e\u201d\uff1b\u5f88\u4e0d\u5e78\u5730\uff0c\u8fd9\u5bf9\u672f\u8bed\u76f4\u63a5\u6309\u5b57\u9762\u7ffb\u8bd1\u8fc7\u6765\u5c31\u6210\u4e86\u201c\u5927\u7aef\u201d\u548c\u201c\u5c0f\u7aef\u201d\uff0c\u8ba9\u4eba\u4ea7\u751f\u8ff7\u60d1\u4e5f\u4e0d\u662f\u5f88\u5947\u602a\u7684\u4e8b\u4e86\u3002<\/span>\n<\/p>\n
\n\t\u4e0d\u8fc7\u7ed9\u6211\u542f\u53d1\u7684\u662f\uff0c\u5728\u88d8\u5b97\u71d5\u7ffb\u8bd1\u7684\u300a\u7a0b\u5e8f\u8bbe\u8ba1\u5b9e\u8df5\u300b\u91cc\uff0c\u8fd9\u5bf9\u672f\u8bed\u5e76\u6ca1\u6709\u7ffb\u8bd1\u4e3a\u201c\u5927\u7aef\u201d\u548c\u5c0f\u7aef\uff0c\u800c\u662f\u201c\u9ad8\u5c3e\u7aef\u201d\u548c\u201c\u4f4e\u5c3e\u7aef\u201d\uff0c\u8fd9\u5c31\u597d\u7406\u89e3\u4e86\uff1a\u5982\u679c\u628a\u4e00\u4e2a\u6570\u770b\u6210\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u6bd4\u598211223344\u770b\u6210”11223344″\uff0c\u672b\u5c3e\u662f\u4e2a’\\0’\uff0c’11’\u5230’44’\u4e2a\u5360\u7528\u4e00\u4e2a\u5b58\u50a8\u5355\u5143\uff0c\u90a3\u4e48\u5b83\u7684\u5c3e\u7aef\u5f88\u663e\u7136\u662f44\uff0c\u524d\u9762\u7684\u9ad8\u8fd8\u662f\u4f4e\u5c31\u8868\u793a\u5c3e\u7aef\u653e\u5728\u9ad8\u5730\u5740\u8fd8\u662f\u4f4e\u5730\u5740\uff0c\u5b83\u5728\u5185\u5b58\u4e2d\u7684\u653e\u6cd5\u975e\u5e38\u76f4\u89c2\uff0c\u5982\u4e0b\u56fe\uff1a<\/span>\n<\/p>\n
\n\t\"\"\n<\/p>\n
\n\t\u201c\u9ad8\/\u4f4e\u5c3e\u7aef\u201d\u6bd4\u201c\u5927\/\u5c0f\u7aef\u201d\u66f4\u4e0d\u5bb9\u6613\u8ba9\u4eba\u8ff7\u60d1\u3002\u4f46\u662f\u6839\u636e\u4e2a\u4eba\u7ecf\u9a8c\uff0c\u5728\u5e02\u9762\u4e0a\u7684\u4e66\u7c4d\u3001\u7f51\u7edc\u4e0a\u7684\u5404\u79cd\u8d44\u6599\u4e2d\uff0c\u5f88\u9057\u61be\uff0c\u524d\u8005\u5df2\u7ecf\u5f88\u5c11\u89c1\u4e86\uff0c\u591a\u89c1\u7684\u662f\u540e\u8005\u3002\u597d\u5728\u8fd9\u4e24\u5bf9\u5f62\u5bb9\u8bcd\u4e2d\uff0c\u6070\u597d\u201c\u9ad8\u201d\u548c\u201c\u5927\u201d\u5bf9\u5e94\uff0c\u201c\u4f4e\u201d\u548c\u201c\u5c0f\u201d\u5bf9\u5e94\uff1b\u65e2\u7136\u9ad8\u5c3e\u7aef\u5bf9\u5e94\u7684\u662f\u5927\u7aef\uff0c\u4f4e\u5c3e\u7aef\u5bf9\u5e94\u7684\u662f\u5c0f\u7aef\uff0c\u90a3\u4e48\u5f53\u4f60\u518d\u89c1\u5230\u5927\u7aef\u548c\u5c0f\u7aef\u8fd9\u4e00\u5bf9\u672f\u8bed\uff0c\u5c31\u53ef\u4ee5\u5728\u8111\u4e2d\u628a\u5b83\u4eec\u8f6c\u5316\u6210\u9ad8\u5c3e\u7aef\u548c\u4f4e\u5c3e\u7aef\uff0c\u8fd9\u65f6\u51ed\u7740\u4e4b\u524d\u7684\u7406\u89e3\uff0c\u751a\u81f3\u4e0d\u7528\u56de\u5fc6\uff0c\u60f3\u7740\u9ad8\u4f4e\u7684\u5b57\u9762\u542b\u4e49\u5c31\u80fd\u56de\u60f3\u8d77\u5b83\u4eec\u7684\u542b\u4e49\u3002\u4f46\u662f\u5f88\u5947\u602a\u7684\u662f\uff0c\u540c\u6837\u662f\u88d8\u5b97\u71d5\u7ffb\u8bd1\u7684\u300a\u7f16\u7a0b\u539f\u672c\u300b\uff08Elements of Programming\uff09\uff0c\u5374\u628abig-endian\u7ffb\u8bd1\u6210\u5927\u5c3e\u683c\u5f0f\uff08\u7b2c\u4e00\u7ae0\uff09\u3002<\/span>\n<\/p>\n
\n\t\u7406\u89e3\u4e4b\u540e\uff0c\u603b\u7ed3\u4e00\u4e0b\uff0c\u8bb0\u5fc6\u7684\u65b9\u6cd5\u662f\uff1a<\/span>\n<\/p>\n
\n
\n\t\t\uff08\u6570\u636e\u770b\u6210\u5b57\u7b26\u4e32\uff09\u5927\u7aef\u2014\u2014\u9ad8\u5c3e\u7aef\uff0c\u5c0f\u7aef\u2014\u2014\u4f4e\u5c3e\u7aef<\/span>\n\t<\/p>\n<\/blockquote>\n
\n\t\u7a0d\u4e00\u601d\u7d22\u4ec0\u4e48\u662f\u201c\u9ad8\u201d\u3001\u4ec0\u4e48\u662f”\u4f4e”\uff0c”\u5c3e\u7aef”\u53c8\u662f\u4ec0\u4e48\uff0c\u95ee\u9898\u8fce\u5203\u800c\u89e3\uff0c\u518d\u4e0d\u7528\u62c5\u5fc3\u88ab\u201c\u5927\u7aef\u201d\u548c\u201c\u5c0f\u7aef\u201d\u8ff7\u60d1\u3002\u7528\u8fd9\u79cd\u65b9\u5f0f\uff0c\u662f\u65f6\u5019\u653e\u5f03\u539f\u5148\u7684\u6b7b\u8bb0\u786c\u80cc\u548c\u5bb9\u6613\u628a\u81ea\u5df1\u7ed5\u8fdb\u53bb\u800c\u53d1\u751f\u8ff7\u60d1\u7684\u7406\u89e3\u4e86\u3002<\/span>\n<\/p>\n
\n\t <\/span>\n<\/p>\n
\n\t\u9644\u5f55\uff1a\u4ec0\u4e48\u662f\u201c\u5927\u7aef\u201d\u548c\u201c\u5c0f\u7aef\u201d\u53ca\u4e00\u6bb5\u6d4b\u8bd5\u672c\u673a\u5927\u7aef\u8fd8\u662f\u5c0f\u7aef\u7684\u4ee3\u7801<\/span>\n<\/p>\n
\n\t\uff08\u8fd9\u6bb5\u6587\u5b57\u662f\u300aUNIX\u7f51\u7edc\u7f16\u7a0b\u00b7\u5377\u4e00\u300b\u7684\u5173\u4e8e\u8fd9\u4e2a\u6982\u5ff5\u7684\u6982\u62ec\uff1b\u4e0d\u4ec5\u9650\u4e8e\u8fd9\u672c\u4e66\uff0c\u5f88\u591a\u8ba1\u7b97\u673a\u4e66\u7c4d\u90fd\u662f\u8fd9\u4e48\u4ecb\u7ecd\u8fd9\u4e2a\u6982\u5ff5\u7684\uff0c\u4f60\u4f1a\u5728\u548c\u8ba1\u7b97\u673a\u76f8\u5173\u4e0d\u540c\u9886\u57df\u7684\u4e66\u4e2d\u9047\u5230\u5b83\u4eec\u3002\u5c3d\u7ba1\u5f88\u4ee4\u4eba\u7591\u60d1\uff0c\u4f46\u662f\u5728\u9605\u8bfb\u6b63\u6587\u524d\uff0c\u4f60\u6700\u597d\u5bf9\u8fd9\u4e24\u4e2a\u8bcd\u8bed\u7684\u6982\u5ff5\u6709\u6240\u7406\u89e3\u3002\u5f53\u7136\uff0c\u5982\u679c\u4f60\u4ee5\u524d\u5411\u6b63\u6587\u4e2d\u63cf\u8ff0\u7684\u4e00\u6837\u63a5\u89e6\u8fc7\u5b83\u4eec\uff0c\u90a3\u5c31\u4e0d\u5fc5\u8bfb\u8fd9\u4e00\u90e8\u5206\u4e86\u3002\u8bfb\u5b8c\u540e\u4f60\u4f1a\u53d1\u73b0\uff0c\u4f60\u867d\u7136\u7406\u89e3\u4e86\u542b\u4e49\uff0c\u4f46\u5f88\u5bb9\u6613\u5fd8\u6389\uff0c\u8fd9\u65f6\u4f60\u5c31\u53ef\u4ee5\u770b\u6b63\u6587\u90e8\u5206\u4e86\uff09<\/span>\n<\/p>\n
\n\t\u5bf9\u4e8e\u4e00\u4e2a\u75312\u4e2a\u5b57\u8282\u7ec4\u6210\u768416\u4f4d\u6574\u6570\uff0c\u5728\u5185\u5b58\u4e2d\u5b58\u50a8\u8fd9\u4e24\u4e2a\u5b57\u8282\u6709\u4e24\u79cd\u65b9\u6cd5\uff1a\u4e00\u79cd\u662f\u5c06\u4f4e\u5e8f\u5b57\u8282\u5b58\u50a8\u5728\u8d77\u59cb\u5730\u5740\uff0c\u8fd9\u79f0\u4e3a\u5c0f\u7aef(little-endian)\u5b57\u8282\u5e8f\uff1b\u53e6\u4e00\u79cd\u65b9\u6cd5\u662f\u5c06\u9ad8\u5e8f\u5b57\u8282\u5b58\u50a8\u5728\u8d77\u59cb\u5730\u5740\uff0c\u8fd9\u79f0\u4e3a\u5927\u7aef(big-endian)\u5b57\u8282\u5e8f\u3002<\/span>\n<\/p>\n
\n\t\"\"\n<\/p>\n
\n\t\u5728\u56fe\u4e2d\uff0c\u9876\u90e8\u8868\u660e\u5185\u5b58\u5730\u5740\u589e\u957f\u65b9\u5411\u4ece\u53f3\u5230\u5de6\uff0c\u5728\u5e95\u90e8\u6807\u660e\u5185\u5b58\u5730\u5740\u589e\u957f\u7684\u65b9\u5411\u4e3a\u4ece\u5de6\u5230\u53f3\u3002\u5e76\u4e14\u8fd8\u6807\u660e\u6700\u9ad8\u6709\u6548\u4f4d(most significant bit\uff0cMSB)\u662f\u8fd9\u4e2a16\u4f4d\u503c\u6700\u5de6\u8fb9\u4e00\u4f4d\uff0c\u6700\u4f4e\u6709\u6548\u4f4d(least significant bit, LSB)\u662f\u8fd9\u4e2a16\u4f4d\u503c\u6700\u53f3\u8fb9\u4e00\u4f4d\u3002\u672f\u8bed\u201c\u5c0f\u7aef\u201d\u548c\u201c\u5927\u7aef\u201d\u8868\u793a\u591a\u4e2a\u5b57\u8282\u503c\u7684\u54ea\u4e00\u7aef\uff08\u5c0f\u7aef\u6216\u5927\u7aef\uff09\u5b58\u50a8\u5728\u8be5\u503c\u7684\u8d77\u59cb\u5730\u5740\u3002<\/span>\n<\/p>\n
\n\t\u8fd9\u4e24\u79cd\u5b57\u8282\u5e8f\u6ca1\u6709\u6807\u51c6\u53ef\u5faa\uff0c\u90fd\u6709\u7cfb\u7edf\u5728\u4f7f\u7528\u3002\u628a\u67d0\u4e2a\u7ed9\u5b9a\u7cfb\u7edf\u6240\u7528\u7684\u5b57\u8282\u5e8f\u79f0\u4e3a\u4e3b\u673a\u5b57\u8282\u5e8f\uff0c\u53ef\u4ee5\u7528\u4ee5\u4e0b\u7a0b\u5e8f\u8f93\u51fa\u4e3b\u673a\u5b57\u8282\u5e8f\u3002\u65b9\u6cd5\u662f\u5728\u4e00\u4e2a\u77ed\u6574\u6570\u53d8\u91cf\u4e2d\u5b58\u653e2\u5b57\u8282\u7684\u503c0x0102\uff0c\u7136\u540e\u67e5\u770b\u5b83\u7684\u8fde\u7eed\u5b57\u8282c[0]\uff08\u5bf9\u5e94\u4e0a\u56fe\u5730\u5740A\uff09\u548cc[1](\u5bf9\u5e94\u4e0a\u56fe\u5730\u5740A+1)\uff0c\u4ee5\u6b64\u786e\u5b9a\u5b57\u8282\u5e8f\u3002<\/span>\n<\/p>\n
\n\t\n<\/p>\n
#include <stdlib.h> <\/pre>\n
#include <stdio.h> <\/pre>\n
int main(int argc, char **argv)\n{\n    union { short s; char c[sizeof(short)];\n    } un;\n    un.s = 0x0102; if(sizeof(short)==2) { if(un.c[0]==1 && un.c[1] == 2)\n            printf(\"big-endian\\n\"); else if (un.c[0] == 2 && un.c[1] == 1)\n            printf(\"little-endian\\n\"); else printf(\"unknown\\n\");\n    } else printf(\"sizeof(short)= %d\\n\",sizeof(short));\n    exit(0);\n}<\/pre>\n
\n
\n
\n\t\t\t\u4f5c\u8005\uff1a<\/span>\u4e94\u5cb3<\/span><\/a> <\/span>
\n\u51fa\u5904\uff1a<\/span>http:\/\/www.cnblogs.com\/wuyuegb2312<\/span><\/a> <\/span>\n\t\t<\/p>\n<\/p><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
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