![\"\"](\"https:\/\/yanjingang.com\/blog\/wp-content\/uploads\/2023\/09\/bit-demo-6.png\" "\\"bit-demo\\"")
<\/p>\n\u5728\u8fdb\u884c\u5d4c\u5165\u5f0f\u5f00\u53d1\u7684\u8fc7\u7a0b\u4e2d\uff0c\u7ecf\u5e38\u4f1a\u9047\u5230\u901a\u4fe1\u534f\u8bae\u662f\u6309bit\u4f4d\u5b9a\u4e49\u7684\u60c5\u51b5\uff0c\u6bd4\u5982\u534f\u8bae\u4e00\u51716\u4e2abyte\u5b57\u8282\uff0c\u6bcf\u4e2abyte\u4e00\u51718bit\u4f4d\uff0c\u4f46\u662f\u4f20\u8f93\u7684\u5f88\u591a\u6570\u636e\u75281\u30012\u4e2abit\u5c31\u8db3\u591f\u4e86\uff0c\u8fd9\u65f6\u534f\u8bae\u4f1a\u6309bit\u5b9a\u4e49\uff0c\u5982\u4f55\u65b9\u4fbf\u5feb\u6377\u7684\u8fdb\u884cbit\u4f4d\u7684\u8d4b\u503c\u548c\u8bfb\u53d6\uff0c\u5373\u4e3a\u672c\u6587\u8bb2\u89e3\u7684\u5185\u5bb9\u3002<\/p>\n
\u4e3a\u4e86\u65b9\u4fbf\u4e00\u6b21\u793a\u8303\u591a\u79cd\u53ef\u80fd\u9047\u5230\u7684\u573a\u666f\uff0c\u5b9a\u4e49\u4e86\u4e0b\u65b9\u7684\u534f\u8bae\u793a\u4f8b\uff1a<\/p>\n
<\/p>\n
\u53ef\u4ee5\u770b\u5230\uff0c\u793a\u4f8b\u534f\u8bae\u8986\u76d6\u4e861bit\u30014bit\u30016bit\u3001\u5faa\u73afbit\u7ed3\u6784\uff0c\u57fa\u672c\u4e0a\u5305\u542b\u4e86\u6211\u4eec\u53ef\u80fd\u9047\u5230\u7684\u534f\u8bae\u573a\u666f\u3002\u4e3a\u4e86\u65b9\u4fbf\u6d4b\u8bd5\uff0c\u6211\u4eec\u8fd9\u91cc\u5047\u8bbe\u6545\u969c\u6570\u91cf\u6700\u5927\u4e3a8\u4e2a\uff0c\u90a3\u4e48\u6570\u636e\u7684\u957f\u5ea6\u57283 + 0-8*2\u4e2abyte\u533a\u95f4\u3002\u63a5\u4e0b\u6765\u6211\u4eec\u5c31\u770b\u4e0b\u5b9e\u73b0\u5c42\u9762\u600e\u4e48\u4f5c\u6bd4\u8f83\u597d\u3002<\/p>\n
\u5728\u8ba1\u7b97\u673a\u4e2d\u6240\u6709\u6570\u636e\u90fd\u662f\u4ee5\u4e8c\u8fdb\u5236\u7684\u5f62\u5f0f\u50a8\u5b58\u7684\uff0c\u4f4d\u8fd0\u7b97\u5176\u5b9e\u5c31\u662f\u76f4\u63a5\u5bf9\u5728\u5185\u5b58\u4e2d\u7684\u4e8c\u8fdb\u5236\u6570\u636e\u8fdb\u884c\u64cd\u4f5c\uff0c\u56e0\u6b64\u5904\u7406\u6570\u636e\u7684\u901f\u5ea6\u975e\u5e38\u5feb\u3002<\/p>\n
\u57fa\u672c\u7684\u4f4d\u64cd\u4f5c\u7b26\u6709\u4e0e\u3001\u6216\u3001\u5f02\u6216\u3001\u53d6\u53cd\u3001\u5de6\u79fb\u3001\u53f3\u79fb\u8fd96\u79cd\uff0c\u5b83\u4eec\u7684\u8fd0\u7b97\u89c4\u5219\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n
int a = -15, b = 15; \r\nprintf(\"%d %d\\n\", a >> 2, b >> 2); \r\n\r\n-4 3<\/code><\/pre>\n-15 = 1111 0001(\u4e8c\u8fdb\u5236)\uff0c\u53f3\u79fb\u4e8c\u4f4d\uff0c\u6700\u9ad8\u4f4d\u7531\u7b26\u53f7\u4f4d\u586b\u5145\u5c06\u5f97\u52301111 1100\u5373-4\u3002<\/p>\n
15=0000 1111(\u4e8c\u8fdb\u5236)\uff0c\u53f3\u79fb\u4e8c\u4f4d\uff0c\u6700\u9ad8\u4f4d\u7531\u7b26\u53f7\u4f4d\u586b\u5145\u5c06\u5f97\u52300000 0011\u53733\u3002<\/p>\n
\u4f4d\u64cd\u4f5c\u53ef\u4ee5\u5e2e\u6211\u4eec\u5b9e\u73b0\u4e00\u90e8\u5206\u9700\u6c42\u3002<\/p>\n
2.std::bitset<\/h4>\n
std::bitset \u662f C++ \u6807\u51c6\u5e93\u4e2d\u7684\u4e00\u4e2a\u7c7b\uff0c\u7528\u4e8e\u8868\u793a\u4e8c\u8fdb\u5236\u4f4d\u5e8f\u5217\u3002\u5b83\u63d0\u4f9b\u4e86\u4e00\u79cd\u65b9\u4fbf\u7684\u65b9\u5f0f\u6765\u5904\u7406\u4e8c\u8fdb\u5236\u6570\u636e\uff0c\u5c24\u5176\u9002\u7528\u4e8e\u4f4d\u8fd0\u7b97\u64cd\u4f5c\u3002 std::bitset \u7c7b\u578b\u8868\u793a\u4e00\u4e2a\u56fa\u5b9a\u957f\u5ea6\u7684\u4f4d\u5e8f\u5217\uff0c\u6bcf\u4e2a\u4f4d\u90fd\u53ea\u80fd\u662f 0 \u6216 1\u3002\u8fd9\u4e2a\u56fa\u5b9a\u957f\u5ea6\u5728\u521b\u5efa\u5bf9\u8c61\u65f6\u6307\u5b9a\uff0c\u5e76\u4e14\u4e0d\u80fd\u5728\u8fd0\u884c\u65f6\u66f4\u6539\u3002\u7c7b\u4f3c\u4e8e\u6574\u6570\u7c7b\u578b\uff0cstd::bitset \u652f\u6301\u591a\u79cd\u64cd\u4f5c\uff0c\u5305\u62ec\u4f4d\u8fd0\u7b97\u3001\u4f4d\u67e5\u8be2\u548c\u4f4d\u8bbe\u7f6e\u3002<\/p>\n
\u4e0b\u9762\u662f\u00a0std::bitset<\/code>\u00a0\u7c7b\u578b\u7684\u4e00\u4e9b\u5e38\u7528\u64cd\u4f5c\uff1a<\/p>\n\nsize()<\/code> \u8fd4\u56de\u00a0bitset<\/code>\u00a0\u7684\u957f\u5ea6<\/li>\ncount()<\/code> \u8fd4\u56de\u00a0bitset<\/code>\u00a0\u4e2d\u503c\u4e3a 1 \u7684\u4f4d\u7684\u6570\u91cf<\/li>\nany()<\/code> \u8fd4\u56de\u00a0bitset<\/code>\u00a0\u4e2d\u662f\u5426\u5b58\u5728\u503c\u4e3a 1 \u7684\u4f4d<\/li>\nnone()<\/code> \u8fd4\u56debitset<\/code>\u00a0\u4e2d\u662f\u5426\u6240\u6709\u4f4d\u90fd\u662f 0<\/li>\nall()<\/code> \u8fd4\u56de\u00a0bitset<\/code>\u00a0\u4e2d\u662f\u5426\u6240\u6709\u4f4d\u90fd\u662f 1<\/li>\ntest(pos)<\/code> \u8fd4\u56de\u00a0bitset<\/code>\u00a0\u4e2d\u4f4d\u4e8e\u00a0pos<\/code>\u00a0\u4f4d\u7f6e\u7684\u503c<\/li>\nset(pos)<\/code> \u5c06\u00a0bitset<\/code>\u00a0\u4e2d\u4f4d\u4e8e\u00a0pos<\/code>\u00a0\u4f4d\u7f6e\u7684\u503c\u8bbe\u4e3a 1<\/li>\nreset(pos)<\/code> \u5c06bitset<\/code>\u00a0\u4e2d\u4f4d\u4e8e\u00a0pos<\/code>\u00a0\u4f4d\u7f6e\u7684\u503c\u8bbe\u4e3a 0<\/li>\nflip(pos)<\/code> \u5c06\u00a0bitset<\/code>\u00a0\u4e2d\u4f4d\u4e8e\u00a0pos<\/code>\u00a0\u4f4d\u7f6e\u7684\u503c\u53d6\u53cd<\/li>\nto_ulong()<\/code> \u8fd4\u56debitset<\/code>\u00a0\u8f6c\u6362\u6210\u7684\u65e0\u7b26\u53f7\u6574\u6570\u503c<\/li>\nto_ullong()<\/code> \u8fd4\u56debitset<\/code>\u00a0\u8f6c\u6362\u6210\u7684\u65e0\u7b26\u53f7\u957f\u6574\u6570\u503c<\/li>\n<\/ul>\n#include <bitset>\r\n\r\nint main(int argc, char* argv[]) {\r\n \/\/ \u4f7f\u7528\u4e8c\u8fdb\u5236\u5b57\u7b26\u4e32\u521d\u59cb\u5316\u4e00\u4e2a\u957f\u5ea6\u4e3a N \u7684 bitset\u5e8f\u5217\r\n std::bitset<(3+8*2)*8> bitset1(\"10100011000000000000000000000000000000000000000000000000000000000000000000000000\"); \r\n bitset1.set(8); \/\/ \u8bbe\u7f6e\u6307\u5b9a\u4f4d \u503c\u4e3a1\r\n bitset1.reset(9); \/\/ \u8bbe\u7f6e\u6307\u5b9a\u4f4d \u503c\u4e3a0\r\n bitset1.to_ulong(); \/\/ \u8f6c\u6362\u4e3a\u65e0\u7b26\u53f7\u6574\u6570\r\n\r\n return 0;\r\n}<\/code><\/pre>\n3.struct<\/h4>\n
struct\u76f8\u4fe1\u5927\u5bb6\u90fd\u6bd4\u8f83\u719f\u6089\u4e86\uff0c\u6211\u4eec\u8fd9\u91cc\u5229\u7528\u5b83\u80fd\u8bbe\u7f6e\u5360\u7528bit\u957f\u5ea6\u7684\u7279\u6027\uff0c\u6765\u5b9e\u73b0\u4e0d\u540c\u5b57\u6bb5\u5206\u522b\u5360\u75281bit\u30014bit\u30016bit\u7684\u957f\u5ea6\uff0c\u5e76\u5b9e\u73b0\u5faa\u73affailures\u7684\u8d4b\u503c\uff1a<\/p>\n
#include <bitset>\r\n#include <memory>\r\n#include <sstream>\r\n#include <iomanip>\r\n#include <vector>\r\n#include <cstdint>\r\n#include <cstring>\r\n#include <iostream>\r\n\r\ntemplate <uint8_t N>\r\nstruct Result {\r\n \/\/ byte 0\r\n uint8_t service : 4; \/\/ \u6b64\u53d8\u91cf\u5360\u75284\u4e2abit\r\n uint8_t type : 4;\r\n\r\n \/\/ byte 1\r\n uint8_t sensor_0 : 1; \/\/ \u6b64\u53d8\u91cf\u5360\u75281\u4e2abit\r\n uint8_t sensor_1 : 1;\r\n uint8_t sensor_2 : 1;\r\n uint8_t sensor_3 : 1;\r\n uint8_t sensor_4 : 1;\r\n uint8_t sensor_5 : 1;\r\n uint8_t obligate_0 : 2; \/\/ \u6b64\u53d8\u91cf\u5360\u75282\u4e2abit\r\n\r\n \/\/ byte 2\r\n uint8_t obligate_1 : 4; \/\/ \u6b64\u53d8\u91cf\u5360\u75284\u4e2abit\r\n uint8_t failure_count : 4;\r\n\r\n \/\/ byte3-...\r\n uint8_t failures[2 * N]; \/\/ \u6545\u969c\u4fe1\u606f \u5360\u75282*N\u4e2abyte\r\n};\r\n\r\nstruct LidarFailReason {\r\n \/\/ byte 0\r\n uint8_t sersor_id : 4;\r\n uint8_t install_fail : 1;\r\n uint8_t point_cloud_too_few : 1;\r\n uint8_t localization_fail : 1;\r\n uint8_t no_model_data : 1;\r\n\r\n \/\/ byte 1\r\n uint8_t obligate_0 : 8; \/\/\u5360\u4f4d\r\n};\r\n\r\nstruct RadarFailReason {\r\n \/\/ byte 0\r\n uint8_t sersor_id : 4;\r\n uint8_t no_point_data : 1;\r\n uint8_t point_to_few : 1;\r\n uint8_t install_fail : 1;\r\n uint8_t obligate_0 : 1;\r\n\r\n \/\/ byte 1\r\n uint8_t obligate_1 : 8; \/\/\u5360\u4f4d\r\n};\r\nstd::string format_to_string(const std::vector<uint8_t>& bytes) {\r\n std::stringstream ss;\r\n ss << std::hex << std::setfill('0');\r\n for (size_t i = 0; i < bytes.size(); ++i) {\r\n ss << std::hex << std::setw(2) << static_cast<int>(bytes[i]);\r\n }\r\n return ss.str();\r\n}\r\n\r\nint main(int argc, char* argv[]) {\r\n \/\/ struct test\r\n Result<8> result;\r\n std::memset(&result, 0, sizeof(result)); \/\/ \u5fc5\u987b\u5148\u5168\u90e8\u4f4d\u90fd\u7f6e\u4e3a\u96f6\uff0c\u5426\u5219\u4e0b\u8fb9\u4e0d\u624b\u52a8\u8bbe\u7f6e\u7684\u5b57\u6bb5\u503c\u4f1a\u662f\u968f\u673a\u7684<\/span>\r\n result.service = 10;\r\n result.type = 3;\r\n result.sensor_0 = 1;\r\n result.sensor_1 = 0;\r\n\r\n \/\/ failures\r\n uint8_t count = 0;\r\n auto lidar = reinterpret_cast<LidarFailReason*>(&(result.failures[2U * count++]));\r\n lidar->sersor_id = 3;\r\n lidar->point_cloud_too_few = 1;\r\n auto radar = reinterpret_cast<RadarFailReason*>(&(result.failures[2U * count++]));\r\n radar->sersor_id = 4;\r\n radar->no_point_data = 1;\r\n \/\/ failure count\r\n result.failure_count = count;\r\n\r\n \/\/ struct to bytes\r\n std::vector<uint8_t> bytes(sizeof(result));\r\n std::memcpy(bytes.data(), &result, sizeof(result));\r\n\r\n \/\/ print bytes\r\n std::cout << \"struct test: \" << format_to_string(bytes);\r\n return 0;\r\n}\r\n\r\nstruct test: 3a012023001400000000000000000000000000<\/code><\/pre>\n4.union+struct<\/h4>\n
\u4f7f\u7528struct\u8fdb\u884c\u4f4d\u8d4b\u503c\uff0c\u5e76\u8f6c\u6362\u6210\u5b57\u8282\u6d41\u8fd8\u662f\u5f88\u65b9\u4fbf\u7684\uff0c\u53ea\u662fbyte\u6d41\u300116\u8fdb\u5236\u7684\u8f6c\u6362\u9700\u8981\u989d\u5916\u505a\u3002\u90a3\u6709\u6ca1\u6709\u65b9\u6cd5\u53ef\u4ee5\u5728\u8bbe\u7f6estruct\u7684\u540c\u65f6\u81ea\u52a8\u5f97\u5230byte\u6d41\u300116\u8fdb\u5236\u6570\u636e\u5462\uff1f\u7528union\u5c31\u53ef\u4ee5\u5b9e\u73b0\u3002<\/p>\n
union\u7684\u57fa\u672c\u793a\u4f8b\uff1a<\/p>\n
union var {\r\n long int l;\r\n int i;\r\n char c[4];\r\n uint8_t c[4];\r\n};\r\nint main(int argc, char* argv[]) {\r\n \r\n \/\/ union test\r\n var v;\r\n v.l = 5;\r\n std::cout << \"l: \" << v.l << std::endl;\r\n v.i = 6;\r\n std::cout << \"i: \" << v.i << std::endl;\r\n std::cout << \"l: \" << v.l << std::endl;\r\n v.c[0] = 0x04;\r\n v.c[1] = 0x03;\r\n v.c[2] = 0x02;\r\n v.c[3] = 0x11;\r\n printf(\"i: %x\\n\", v.i); \/\/ 0x11020304\r\n std::cout << \"l: \" << v.l << std::endl;\r\n std::cout << \"i: \" << v.i << std::endl;\r\n\r\n return 0;\r\n}\r\nl: 5\r\nl: 6\r\ni: 6\r\nix: 11020304 # \r\nl: 285344516\r\ni: 285344516\r\n<\/code><\/pre>\n\u901a\u8fc7\u4e0a\u65b9\u7684\u793a\u4f8b\u53ef\u4ee5\u770b\u5230\uff0cunion\u5171\u540c\u4f53\u7684\u7279\u6027\u662f\uff0c\u5171\u540c\u4f53\u5185\u7684\u6240\u6709\u53d8\u91cf\u5b8c\u5168\u5171\u7528\u540c\u4e00\u4e2a\u5185\u5b58\u9996\u5730\u5740\uff0c\u5185\u5b58\u5927\u5c0f\u6309\u7167\u5360\u7528\u91cf\u6700\u5927\u7684\u90a3\u4e2a\u53d8\u91cf\u5206\u914d<\/span>\uff0c\u5404\u53d8\u91cf\u90fd\u53ef\u4ee5\u5206\u522b\u8bfb\u5199\uff0c\u64cd\u4f5c\u7684\u662f\u540c\u4e00\u5757\u5185\u5b58\uff0c\u6240\u4ee5\u4e00\u4e2a\u53d8\u91cf\u7684\u5185\u5b58\u4fee\u6539\u4f1a\u5bfc\u81f4\u53e6\u4e00\u4e2a\u53d8\u91cf\u7684\u503c\u540c\u6b65\u53d1\u751f\u53d8\u5316\u3002<\/p>\n\u6211\u4eec\u6309\u7167\u8fd9\u4e2a\u601d\u8def\uff0c\u628a\u524d\u8fb9\u7684stuct\u6539\u9020\u4e3aunion+struct\uff1a<\/p>\n
#include <bitset>\r\n#include <memory>\r\n#include <sstream>\r\n#include <iomanip>\r\n#include <vector>\r\n#include <cstdint>\r\n#include <cstring>\r\n#include <iostream>\r\n\r\ntemplate <uint8_t N>\r\nunion ResponseResult {\r\n struct Result {\r\n \/\/ byte 0\r\n uint8_t service : 4; \/\/ \u6b64\u53d8\u91cf\u5360\u75284\u4e2abit\r\n uint8_t type : 4;\r\n\r\n \/\/ byte 1\r\n uint8_t sensor_0 : 1; \/\/ \u6b64\u53d8\u91cf\u5360\u75281\u4e2abit\r\n uint8_t sensor_1 : 1;\r\n uint8_t sensor_2 : 1;\r\n uint8_t sensor_3 : 1;\r\n uint8_t sensor_4 : 1;\r\n uint8_t sensor_5 : 1;\r\n uint8_t obligate_0 : 2; \/\/ \u6b64\u53d8\u91cf\u5360\u75282\u4e2abit\r\n\r\n \/\/ byte 2\r\n uint8_t obligate_1 : 4; \/\/ \u6b64\u53d8\u91cf\u5360\u75284\u4e2abit\r\n uint8_t failure_count : 4;\r\n\r\n \/\/ byte3-...\r\n uint8_t failures[2 * N]; \/\/ \u6545\u969c\u4fe1\u606f \u5360\u75282*N\u4e2abyte\r\n } data;\r\n uint8_t u8data[2 * N + 3]; \/\/ \u5360\u7528N*2\u4e2a\u6545\u969c\u4fe1\u606fbyte + 3\u4e2a\u56fa\u5b9a byte\r\n};\r\n\r\nstruct LidarFailReason {\r\n \/\/ byte 0\r\n uint8_t sersor_id : 4;\r\n uint8_t install_fail : 1;\r\n uint8_t point_cloud_too_few : 1;\r\n uint8_t localization_fail : 1;\r\n uint8_t no_model_data : 1;\r\n\r\n \/\/ byte 1\r\n uint8_t obligate_1 : 8; \/\/\u5360\u4f4d\r\n};\r\n\r\nstruct RadarFailReason {\r\n \/\/ byte 0\r\n uint8_t sersor_id : 4;\r\n uint8_t no_point_data : 1;\r\n uint8_t point_to_few : 1;\r\n uint8_t install_fail : 1;\r\n uint8_t obligate_0 : 1;\r\n\r\n \/\/ byte 1\r\n uint8_t obligate_1 : 8; \/\/\u5360\u4f4d\r\n};\r\n\r\nint main(int argc, char* argv[]) {\r\n \/\/ union+struce test\r\n ResponseResult<8> result;\r\n std::memset(result.u8data, 0, sizeof(result)); \/\/ \u5fc5\u987b\u5148\u5168\u90e8\u4f4d\u90fd\u7f6e\u4e3a\u96f6\uff0c\u5426\u5219\u4e0b\u8fb9\u4e0d\u624b\u52a8\u8bbe\u7f6e\u7684\u5b57\u6bb5\u503c\u4f1a\u662f\u968f\u673a\u7684\r\n std::cout << \"struct size: \" << sizeof(result) << std::endl;\r\n \/\/result.u8data[0] = 0x3a;\r\n result.data.service = 10;\r\n result.data.type = 3;\r\n result.data.sensor_0 = 1;\r\n result.data.sensor_1 = 0;\r\n\r\n \/\/ failures\r\n uint8_t count = 0;\r\n auto lidar = reinterpret_cast<LidarFailReason*>(&(result.data.failures[2U * count++]));\r\n lidar->sersor_id = 3;\r\n lidar->point_cloud_too_few = 1;\r\n auto radar = reinterpret_cast<RadarFailReason*>(&(result.data.failures[2U * count++]));\r\n radar->sersor_id = 4;\r\n radar->no_point_data = 1;\r\n \/\/ failure count\r\n result.data.failure_count = count;\r\n\r\n \/\/ print\r\n std::stringstream ss;\r\n ss << std::hex << std::setfill('0');\r\n std::cout << \"u8data size: \" << sizeof(result.u8data) << \" \" << sizeof(result.u8data[0]) << std::endl;\r\n for (size_t i = 0; i < sizeof(result.u8data) \/ sizeof(result.u8data[0]); ++i) {\r\n ss << std::hex << std::setw(2) << static_cast<int>(result.u8data[i]);\r\n }\r\n std::cout << \"union+struce: \" << ss.str() << std::endl;\r\n\r\n \/\/ \u7cfb\u7edf\u5927\u5c0f\u7aef\u5224\u65ad\uff08\u4e0d\u540c\u7aef\u5b57\u8282\u5185\u7684\u9ad8\u4f4e\u4f4d\u7684\u524d\u540e\u987a\u5e8f\u4e0d\u540c\uff09\r\n if (result.u8data[0] == 0x3a) {\r\n std::cout << \"this is little endian system\" << std::endl;\r\n } else {\r\n std::cout << \"this is big endian system\" << std::endl;\r\n }\r\n return 0;\r\n}\r\n\r\nstruct size: 19\r\nu8data size: 19 1\r\nunion+struce: 3a012023001400000000000000000000000000\r\nthis is little endian system<\/code><\/pre>\n\u53ef\u4ee5\u770b\u5230\uff0c\u901a\u8fc7union\u7684.data\u7ed3\u6784\u4f53\uff0c\u6216.u8data\uff0c\u5747\u53ef\u8bfb\u5199\u76f8\u5173\u6570\u636e\uff0c\u6211\u4eec\u53ef\u4ee5\u7528struct\u6765\u65b9\u4fbf\u8d4b\u503c\uff0c\u4f7f\u7528u8data\u7528\u6765\u6309\u5b57\u8282\u8bfb\u53d6\uff0c\u5bf9\u5b9e\u9645\u7684\u4f7f\u7528\u573a\u666f\u6765\u8bf4\u65b9\u4fbf\u4e86\u5f88\u591a\u3002<\/p>\n
\u4e09\u3001\u5e38\u89c1\u95ee\u9898<\/h1>\n1. \u968f\u673a\u503c\u95ee\u9898<\/h4>\n
union+struct\u4f7f\u7528\u65f6\uff0c\u5efa\u8bae\u5148\u5168\u90e8\u4f4d\u90fd\u7f6e\u4e3a\u96f6\uff0c\u5426\u5219\u4e00\u65e6\u4e0d\u80fd\u4e3a\u6240\u6709\u5b57\u6bb5\u663e\u5f0f\u8bbe\u7f6e\u503c\uff0c\u5219\u672a\u8bbe\u7f6e\u7684\u5b57\u6bb5\u503c\u5c06\u4f1a\u5728\u6bcf\u6b21\u7f16\u8bd1\u65f6\u968f\u673a\u3002<\/p>\n
2.\u5927\u5c0f\u7aef\u95ee\u9898<\/h4>\n
\u4e0d\u540c\u7684\u64cd\u4f5c\u7cfb\u7edf\u5e73\u53f0\u4e0a\uff0c\u5927\u5c0f\u7aef\u4e0d\u540c\uff0c\u5982\u6d89\u53ca\u76f8\u4e92\u7684\u6570\u636e\u901a\u4fe1\uff0c\u5219\u9700\u8981\u7279\u522b\u5173\u6ce8\u4ed6\u4eec\u751f\u6210\u7684\u5b57\u8282\u6d41\u987a\u5e8f\u5dee\u5f02\u3002<\/p>\n
3.union\u7684\u5185\u5b58\u5927\u5c0f\u5dee\u5f02<\/h4>\n
union\u4ec5\u5171\u7528\u540c\u4e00\u4e2a\u5185\u5b58\u9996\u5730\u5740\uff0c\u5982\u679cunion\u53d8\u91cf\u5185\u5b58\u957f\u5ea6\u4e0d\u540c\uff0c\u5219\u5bb9\u6613\u51fa\u73b0\u610f\u60f3\u4e0d\u5230\u7684\u95ee\u9898\uff0c\u56e0\u6b64\u5efa\u8baeunion\u5185\u7684\u591a\u4e2a\u53d8\u91cf\u5185\u5b58\u957f\u5ea6\u4fdd\u6301\u4e00\u81f4\u3002<\/p>\n
<\/p>\n
yan 23.9.3<\/p>\n
<\/p>\n
\u53c2\u8003\uff1a<\/p>\n
C++\uff1a\u4f4d\u64cd\u4f5c\u57fa\u7840\u7bc7\u4e4b\u4f4d\u64cd\u4f5c\u5168\u9762\u603b\u7ed3<\/a><\/p>\n