编程语言中,差、交、并、自然连接、选择、投影、笛卡尔积分别是什么意思? vb中,差、交、并、自然连接、选择、投影、笛卡尔积分别都是什...
\u7f16\u7a0b\u8bed\u8a00\u4e2d\uff0c\u5dee\u3001\u4ea4\u3001\u5e76\u3001\u81ea\u7136\u8fde\u63a5\u3001\u9009\u62e9\u3001\u6295\u5f71\u3001\u7b1b\u5361\u5c14\u79ef\u5206\u522b\u90fd\u662f\u4ec0\u4e48\u8fd0\u7b97\uff1f\u4ea4\uff08Intersection\uff09\uff1a
\u5173\u7cfbR\u4e0e\u5173\u7cfbS\u7684\u4ea4\u7531\u65e2\u5c5e\u4e8eR\u53c8\u5c5e\u4e8eS\u7684\u5143\u7ec4\u7ec4\u6210\uff0c\u5373R\u4e0eS\u4e2d\u76f8\u540c\u7684\u5143\u7ec4\uff0c\u7ec4\u6210\u4e00\u4e2a\u65b0\u5173\u7cfb\uff0c\u5176\u7ed3\u679c\u4ecd\u4e3an\u76ee\u5173\u7cfb\u3002\u8bb0\u4f5c\uff1aR\u2229S={t|t\u2208R \u2227 t\u2208S}
\u7b80\u5355\u6765\u8bf4\uff0c\u8fd0\u7b97\u7ed3\u679c\u5c31\u662f\u4e24\u6216\u591a\u4e2a\u5b9e\u4f53\u96c6\u6240\u5171\u6709\u7684\u90e8\u5206
\u5e76\uff08Union\uff09\uff1a
\u5173\u7cfbR\u548c\u5173\u7cfbS\u7684\u5e76\u7531\u5c5e\u4e8eR\u6216\u5c5e\u4e8eS\u7684\u5143\u7ec4\u7ec4\u6210\uff0c\u5373R\u548cS\u7684\u6240\u6709\u5143\u7ec4\u5408\u5e76\uff0c\u5220\u53bb\u91cd\u590d\u5143\u7ec4\uff0c\u7ec4\u6210\u4e00\u4e2a\u65b0\u5173\u7cfb\uff0c\u5176\u7ed3\u679c\u4ecd\u4e3an\u76ee\u5173\u7cfb\uff08\u201cn\u76ee\u201d\u6307\u5173\u7cfb\u6a21\u5f0f\u4e2d\u5c5e\u6027\u7684\u6570\u76ee\u4e3an\uff09 \u3002\u8bb0\u4f5c\uff1aR\u222aS={t|t\u2208R\u2228t\u2208S}
\u7b80\u5355\u6765\u8bf4\uff0c\u8fd0\u7b97\u7ed3\u679c\u4e3a\u4e24\u6216\u591a\u4e2a\u5b9e\u4f53\u96c6\u52a0\u8d77\u6765\uff0c\u7136\u540e\u91cd\u590d\u7684\u90e8\u5206\u53ea\u7559\u4e0b\u4e00\u4e2a
\u5dee\uff08Difference\uff09
\u5173\u7cfbR\u4e0e\u5173\u7cfbS\u7684\u5dee\u7531\u5c5e\u4e8eR\u800c\u4e0d\u5c5e\u4e8eS\u7684\u6240\u6709\u5143\u7ec4\u7ec4\u6210\uff0c\u5373R\u4e2d\u5220\u53bb\u4e0eS\u4e2d\u76f8\u540c\u7684\u5143\u7ec4\uff0c\u7ec4\u6210\u4e00\u4e2a\u65b0\u5173\u7cfb\uff0c\u5176\u7ed3\u679c\u4ecd\u4e3an\u76ee\u5173\u7cfb\u3002\u8bb0\u4f5c\uff1aR-S={t|t\u2208R\u2227\u2510t\u2208S}
\u7b80\u5355\u6765\u8bf4\uff0c\u8fd0\u7b97\u7ed3\u679c\u4e3a\uff0c\u5728\u8868R\u4e2d\u53bb\u6389\u8868S\u4e5f\u6709\u7684\u90e8\u5206
\u5e7f\u4e49\u7b1b\u5361\u5c14\u79ef\uff08Extended Cartesian Product\uff09
\u4e24\u4e2a\u5206\u522b\u4e3an\u76ee\u548cm\u76ee\u5173\u7cfbR\u548cS\u7684\u5e7f\u4e49\u7b1b\u5361\u5c14\u79ef\u662f\u4e00\u4e2a\uff08n+m\uff09\u5217\u7684\u5143\u7ec4\u7684\u96c6\u5408\uff0c\u5143\u7ec4\u7684\u524dn\u5217\u662f\u5173\u7cfbR\u7684\u4e00\u4e2a\u5143\u7ec4\uff0c\u540em\u5217\u662f\u5173\u7cfbS\u7684\u4e00\u4e2a\u5143\u7ec4\u3002\u82e5R\u6709k1\u4e2a\u5143\u7ec4\uff0cS\u6709k2\u4e2a\u5143\u7ec4\uff0c\u5219\u5173\u7cfbR\u548c\u5173\u7cfbS\u7684\u5e7f\u4e49\u7b1b\u5361\u5c14\u79ef\u6709k1*k2\u4e2a\u5143\u7ec4\uff0c\u8bb0\u4f5c\uff1aR\u00d7S={tr\u2312ts| tr\u2208R\u2227ts\u2208S}
\u6216\u8bb0\u505aR\u00d7S={(r1,\u2026,rn ,s1,\u2026,sm)\u2223((r1,\u2026,rn)\u2208R\u2227(s1,\u2026,sm)\u2208S)
r,s\u4e3aR\u548cS\u4e2d\u7684\u76f8\u5e94\u5206\u91cf\u3002
\u7b80\u5355\u6765\u8bf4\uff0c\u5c31\u662f\u628aR\u8868\u7684\u7b2c\u4e00\u884c\u4e0eS\u8868\u7b2c\u4e00\u884c\u7ec4\u5408\u5199\u5728\u4e00\u8d77\uff0c\u4f5c\u4e3a\u4e00\u884c\u3002\u7136\u540e\u628aR\u8868\u7684\u7b2c\u4e00\u884c\u4e0eS\u8868\u7b2c\u4e8c\u884c\u4f9d\u6b64\u5199\u5728\u4e00\u8d77\uff0c\u4f5c\u4e3a\u65b0\u4e00\u884c\u3002\u4ee5\u6b64\u7c7b\u63a8\u3002\u5f53S\u8868\u7684\u6bcf\u4e00\u884c\u90fd\u4e0eR\u8868\u7684\u7b2c\u4e00\u884c\u7ec4\u5408\u8fc7\u4e00\u6b21\u4ee5\u540e\uff0c\u6362R\u8868\u7684\u7b2c\u4e8c\u884c\u4e0eS\u8868\u7b2c\u4e00\u884c\u7ec4\u5408\uff0c\u4ee5\u6b64\u7c7b\u63a8\uff0c\u76f4\u5230R\u8868\u4e0eS\u8868\u7684\u6bcf\u4e00\u884c\u90fd\u7ec4\u5408\u8fc7\u4e00\u6b21\uff0c\u5219\u8fd0\u7b97\u5b8c\u6bd5\u3002
\u5982\u679cR\u8868\u6709n\u884c\uff0cS\u8868\u6709M\u884c\uff0c\u90a3\u4e48\u7b1b\u5361\u5c14\u79efR\u00d7S\u6709n\u00d7M\u884c\u3002
\u9009\u53d6\uff08Selection\uff09
\u9009\u53d6\u8fd0\u7b97\u662f\u5355\u76ee\u8fd0\u7b97\uff0c\u662f\u6839\u636e\u4e00\u5b9a\u7684\u6761\u4ef6\u5728\u7ed9\u5b9a\u7684\u5173\u7cfbR\u4e2d\u9009\u53d6\u82e5\u5e72\u4e2a\u5143\u7ec4\uff0c\u7ec4\u6210\u4e00\u4e2a\u65b0\u5173\u7cfb\uff0c\u8bb0\u4f5c\uff1a\u03c3F(R)={t|t\u2208R\u2227F(t)\u4e3a\u771f}
\u5176\u4e2d\uff0c\u03c3\u4e3a\u9009\u53d6\u8fd0\u7b97\u7b26\uff0cF\u4e3a\u9009\u53d6\u7684\u6761\u4ef6\uff0c\u5b83\u7531\u8fd0\u7b97\u5bf9\u8c61\uff08\u5c5e\u6027\u540d\u3001\u5e38\u6570\u3001\u7b80\u5355\u51fd\u6570\uff09\u3001\u7b97\u672f\u6bd4\u8f83\u8fd0\u7b97\u7b26\uff08 > \uff0c\u2265\uff0c<\uff0c\u2264\uff0c=\uff0c\u2260\uff09\u548c\u903b\u8f91\u8fd0\u7b97\u7b26\uff08\u2228 \u2227 \u2510\uff09\u8fde\u63a5\u8d77\u6765\u7684\u903b\u8f91\u8868\u8fbe\u5f0f\uff0c\u7ed3\u679c\u4e3a\u903b\u8f91\u503c\u201c\u771f\u201d\u6216\u201c\u5047\u201d\u3002
\u9009\u53d6\u8fd0\u7b97\u5b9e\u9645\u4e0a\u662f\u4ece\u5173\u7cfbR\u4e2d\u9009\u53d6\u4f7f\u903b\u8f91\u8868\u8fbe\u5f0f\u4e3a\u771f\u7684\u5143\u7ec4\uff0c\u662f\u4ece\u884c\u7684\u89d2\u5ea6\u8fdb\u884c\u7684\u8fd0\u7b97\u3002
\u7b80\u5355\u5730\u8bf4\uff0c\u8fd0\u7b97\u7ed3\u679c\u5c31\u662f\u7b26\u5408\u7b5b\u9009\u6761\u4ef6\u7684\u884c
\u9009\u62e9\u662f\u6839\u636e\u7ed9\u5b9a\u7684\u6761\u4ef6\u9009\u62e9\u5173\u7cfbR\u4e2d\u7684\u82e5\u5e72\u5143\u7ec4\u7ec4\u6210\u65b0\u7684\u5173\u7cfb\uff0c\u662f\u5bf9\u5173\u7cfb\u7684\u5143\u7ec4\u8fdb\u884c\u7b5b\u9009\u3002\u9009\u62e9\u8fd0\u7b97\u793a\u610f\u56fe\u5982\u4e0b\uff1a
\u6295\u5f71\uff08Projection\uff09
\u6295\u5f71\u8fd0\u7b97\u4e5f\u662f\u5355\u76ee\u8fd0\u7b97\uff0c\u5173\u7cfbR\u4e0a\u7684\u6295\u5f71\u662f\u4eceR\u4e2d\u9009\u62e9\u51fa\u82e5\u5e72\u5c5e\u6027\u5217\uff0c\u7ec4\u6210\u65b0\u7684\u5173\u7cfb\uff0c\u5373\u5bf9\u5173\u7cfb\u5728\u5782\u76f4\u65b9\u5411\u8fdb\u884c\u7684\u8fd0\u7b97\uff0c\u4ece\u5de6\u5230\u53f3\u6309\u7167\u6307\u5b9a\u7684\u82e5\u5e72\u5c5e\u6027\u53ca\u987a\u5e8f\u53d6\u51fa\u76f8\u5e94\u5217\uff0c\u5220\u53bb\u91cd\u590d\u5143\u7ec4\u3002\u8bb0\u4f5c\uff1a\u03a0A(R)={t[A]|t\u2208R}
\u5176\u4e2dA\u4e3aR\u4e2d\u7684\u5c5e\u6027\u5217\uff0c\u03a0\u4e3a\u6295\u5f71\u8fd0\u7b97\u7b26\u3002
\u4ece\u5176\u5b9a\u4e49\u53ef\u770b\u51fa\uff0c\u6295\u5f71\u8fd0\u7b97\u662f\u4ece\u5217\u7684\u89d2\u5ea6\u8fdb\u884c\u7684\u8fd0\u7b97\uff0c\u8fd9\u6b63\u662f\u9009\u53d6\u8fd0\u7b97\u548c\u6295\u5f71\u8fd0\u7b97\u7684\u533a\u522b\u6240\u5728\u3002\u9009\u53d6\u8fd0\u7b97\u662f\u4ece\u5173\u7cfb\u7684\u6c34\u5e73\u65b9\u5411\u4e0a\u8fdb\u884c\u8fd0\u7b97\u7684\uff0c\u800c\u6295\u5f71\u8fd0\u7b97\u5219\u662f\u4ece\u5173\u7cfb\u7684\u5782\u76f4\u65b9\u5411\u4e0a\u8fdb\u884c\u7684\u3002
\u7b80\u5355\u5730\u8bf4\uff0c\u5c31\u662f\u9009\u53d6\u7b26\u5408\u7b5b\u9009\u6761\u4ef6\u7684\u5217\uff0c\u7136\u540e\u6309\u7167\u4f60\u6240\u9700\u8981\u7684\u987a\u5e8f\u91cd\u65b0\u6392\u5217\u3002
\u8fde\u63a5\uff08Join\uff09
\u8fde\u63a5\u8fd0\u7b97\u662f\u4e8c\u76ee\u8fd0\u7b97\uff0c\u662f\u4ece\u4e24\u4e2a\u5173\u7cfb\u7684\u7b1b\u5361\u5c14\u79ef\u4e2d\u9009\u53d6\u6ee1\u8db3\u8fde\u63a5\u6761\u4ef6\u7684\u5143\u7ec4\uff0c\u7ec4\u6210\u65b0\u7684\u5173\u7cfb\u3002
\u6240\u8c13\u81ea\u7136\u8fde\u63a5\u5c31\u662f\u5728\u7b49\u503c\u8fde\u63a5\u7684\u60c5\u51b5\u4e0b\uff0c\u5f53\u8fde\u63a5\u5c5e\u6027X\u4e0eY\u5177\u6709\u76f8\u540c\u5c5e\u6027\u7ec4\u65f6\uff0c\u628a\u5728\u8fde\u63a5\u7ed3\u679c\u4e2d\u91cd\u590d\u7684\u5c5e\u6027\u5217\u53bb\u6389\u3002\u5373\u5982\u679cR\u4e0eS\u5177\u6709\u76f8\u540c\u7684\u5c5e\u6027\u7ec4Y\uff0c\u5219\u81ea\u7136\u8fde\u63a5\u53ef\u8bb0\u4f5c\uff1aR*S={t r\u2312ts |tr\u2208R\u2227ts\u2208S\u2227tr[Y]=ts[Y]}
\u81ea\u7136\u8fde\u63a5\u662f\u5728\u5e7f\u4e49\u7b1b\u5361\u5c14\u79efR\u00d7S\u4e2d\u9009\u51fa\u540c\u540d\u5c5e\u6027\u4e0a\u7b26\u5408\u76f8\u7b49\u6761\u4ef6\u5143\u7ec4\uff0c\u518d\u8fdb\u884c\u6295\u5f71\uff0c\u53bb\u6389\u91cd\u590d\u7684\u540c\u540d\u5c5e\u6027\uff0c\u7ec4\u6210\u65b0\u7684\u5173\u7cfb\u3002
\u4ea4\uff08Intersection\uff09
\u5173\u7cfbR\u4e0e\u5173\u7cfbS\u7684\u4ea4\u7531\u65e2\u5c5e\u4e8eR\u53c8\u5c5e\u4e8eS\u7684\u5143\u7ec4\u7ec4\u6210\uff0c\u5373R\u4e0eS\u4e2d\u76f8\u540c\u7684\u5143\u7ec4\uff0c\u7ec4\u6210\u4e00\u4e2a\u65b0\u5173\u7cfb\uff0c\u5176\u7ed3\u679c\u4ecd\u4e3an\u76ee\u5173\u7cfb\u3002\u8bb0\u4f5c\uff1aR\u2229S={t|t\u2208R \u2227 t\u2208S}\u3002
\u5e76\uff08Union\uff09
\u5173\u7cfbR\u548c\u5173\u7cfbS\u7684\u5e76\u7531\u5c5e\u4e8eR\u6216\u5c5e\u4e8eS\u7684\u5143\u7ec4\u7ec4\u6210\uff0c\u5373R\u548cS\u7684\u6240\u6709\u5143\u7ec4\u5408\u5e76\uff0c\u5220\u53bb\u91cd\u590d\u5143\u7ec4\uff0c\u7ec4\u6210\u4e00\u4e2a\u65b0\u5173\u7cfb\uff0c\u5176\u7ed3\u679c\u4ecd\u4e3an\u76ee\u5173\u7cfb\uff08\u201cn\u76ee\u201d\u6307\u5173\u7cfb\u6a21\u5f0f\u4e2d\u5c5e\u6027\u7684\u6570\u76ee\u4e3an\uff09 \u3002\u8bb0\u4f5c\uff1aR\u222aS={t|t\u2208R\u2228t\u2208S}\u3002
\u5dee\uff08Difference\uff09
\u5173\u7cfbR\u4e0e\u5173\u7cfbS\u7684\u5dee\u7531\u5c5e\u4e8eR\u800c\u4e0d\u5c5e\u4e8eS\u7684\u6240\u6709\u5143\u7ec4\u7ec4\u6210\uff0c\u5373R\u4e2d\u5220\u53bb\u4e0eS\u4e2d\u76f8\u540c\u7684\u5143\u7ec4\uff0c\u7ec4\u6210\u4e00\u4e2a\u65b0\u5173\u7cfb\uff0c\u5176\u7ed3\u679c\u4ecd\u4e3an\u76ee\u5173\u7cfb\u3002\u8bb0\u4f5c\uff1aR-S={t|t\u2208R\u2227\u2510t\u2208S}\u3002
\u5e7f\u4e49\u7b1b\u5361\u5c14\u79ef\uff08Extended Cartesian Product\uff09
\u4e24\u4e2a\u5206\u522b\u4e3an\u76ee\u548cm\u76ee\u5173\u7cfbR\u548cS\u7684\u5e7f\u4e49\u7b1b\u5361\u5c14\u79ef\u662f\u4e00\u4e2a\uff08n+m\uff09\u5217\u7684\u5143\u7ec4\u7684\u96c6\u5408\uff0c\u5143\u7ec4\u7684\u524dn\u5217\u662f\u5173\u7cfbR\u7684\u4e00\u4e2a\u5143\u7ec4\uff0c\u540em\u5217\u662f\u5173\u7cfbS\u7684\u4e00\u4e2a\u5143\u7ec4\u3002
\u82e5R\u6709k1\u4e2a\u5143\u7ec4\uff0cS\u6709k2\u4e2a\u5143\u7ec4\uff0c\u5219\u5173\u7cfbR\u548c\u5173\u7cfbS\u7684\u5e7f\u4e49\u7b1b\u5361\u5c14\u79ef\u6709k1*k2\u4e2a\u5143\u7ec4\uff0c\u8bb0\u4f5c\uff1aR\u00d7S={tr\u2312ts| tr\u2208R\u2227ts\u2208S}\u6216\u8bb0\u505aR\u00d7S={(r1,\u2026,rn ,s1,\u2026,sm)\u2223((r1,\u2026,rn)\u2208R\u2227(s1,\u2026,sm)\u2208S)\u3002
\u9009\u53d6\uff08Selection\uff09
\u9009\u53d6\u8fd0\u7b97\u662f\u5355\u76ee\u8fd0\u7b97\uff0c\u662f\u6839\u636e\u4e00\u5b9a\u7684\u6761\u4ef6\u5728\u7ed9\u5b9a\u7684\u5173\u7cfbR\u4e2d\u9009\u53d6\u82e5\u5e72\u4e2a\u5143\u7ec4\uff0c\u7ec4\u6210\u4e00\u4e2a\u65b0\u5173\u7cfb\uff0c\u8bb0\u4f5c\uff1a\u03c3F(R)={t|t\u2208R\u2227F(t)\u4e3a\u771f}\u3002
\u6295\u5f71\uff08Projection\uff09
\u5173\u7cfbR\u4e0a\u7684\u6295\u5f71\u662f\u4eceR\u4e2d\u9009\u62e9\u51fa\u82e5\u5e72\u5c5e\u6027\u5217\uff0c\u7ec4\u6210\u65b0\u7684\u5173\u7cfb\uff0c\u5373\u5bf9\u5173\u7cfb\u5728\u5782\u76f4\u65b9\u5411\u8fdb\u884c\u7684\u8fd0\u7b97\uff0c\u4ece\u5de6\u5230\u53f3\u6309\u7167\u6307\u5b9a\u7684\u82e5\u5e72\u5c5e\u6027\u53ca\u987a\u5e8f\u53d6\u51fa\u76f8\u5e94\u5217\uff0c\u5220\u53bb\u91cd\u590d\u5143\u7ec4\u3002\u8bb0\u4f5c\uff1a\u03a0A(R)={t[A]|t\u2208R}\u3002
\u8fde\u63a5\uff08Join\uff09
\u5f53\u8fde\u63a5\u5c5e\u6027X\u4e0eY\u5177\u6709\u76f8\u540c\u5c5e\u6027\u7ec4\u65f6\uff0c\u628a\u5728\u8fde\u63a5\u7ed3\u679c\u4e2d\u91cd\u590d\u7684\u5c5e\u6027\u5217\u53bb\u6389\u3002\u5373\u5982\u679cR\u4e0eS\u5177\u6709\u76f8\u540c\u7684\u5c5e\u6027\u7ec4Y\uff0c\u5219\u81ea\u7136\u8fde\u63a5\u53ef\u8bb0\u4f5c\uff1aR*S={t r\u2312ts |tr\u2208R\u2227ts\u2208S\u2227tr[Y]=ts[Y]}\u3002
\u6269\u5c55\u8d44\u6599
\u8bed\u8a00\u7f16\u7a0b\uff0cVB\u662f\u4e16\u754c\u4e0a\u4f7f\u7528\u4eba\u6570\u6700\u591a\u7684\u8bed\u8a00\u2014\u2014\u4e0d\u4ec5\u662f\u76db\u8d5eVB\u7684\u5f00\u53d1\u8005\u8fd8\u662f\u62b1\u6028VB\u5f00\u53d1\u8005\u7684\u6570\u91cf\u3002\u5b83\u6e90\u81ea\u4e8eBASIC\u7f16\u7a0b\u8bed\u8a00\u3002
VB\u62e5\u6709\u56fe\u5f62\u7528\u6237\u754c\u9762\uff08GUI\uff09\u548c\u5feb\u901f\u5e94\u7528\u7a0b\u5e8f\u5f00\u53d1\uff08RAD\uff09\u7cfb\u7edf\uff0c\u53ef\u4ee5\u8f7b\u6613\u4f7f\u7528DAO\u3001RDO\u3001ADO\u8fde\u63a5\u6570\u636e\u5e93\uff0c\u6216\u8005\u8f7b\u677e\u7684\u521b\u5efaActiveX\u63a7\u4ef6\u3002\u7a0b\u5e8f\u5458\u53ef\u4ee5\u8f7b\u677e\u7684\u4f7f\u7528VB\u63d0\u4f9b\u7684\u7ec4\u4ef6\u5feb\u901f\u5efa\u7acb\u4e00\u4e2a\u5e94\u7528\u7a0b\u5e8f\u3002
\u4f18\u70b9\uff1a
1\u3001Visual Basic \u63d0\u4f9b\u4e86\u5f3a\u5927\u7684\u53ef\u89c6\u5316\u7f16\u7a0b\u80fd\u529b\uff0c\u53ef\u4ee5\u8ba9\u4f60\u8f7b\u677e\u5730\u505a\u51fa\u6f02\u4eae\u7684\u7a0b\u5e8f\u3002
2\u3001\u4f17\u591a\u7684\u63a7\u4ef6\u8ba9\u7f16\u7a0b\u53d8\u5f97\u8c61\u5792\u79ef\u6728\u4e00\u6837\u7b80\u5355\u3002
3\u3001Visual Basic \u5168\u90e8\u6c49\u5316\uff0c\u5bf9\u4e8e\u4e0d\u4f1a\u82f1\u8bed\u7684\u4eba\u4e5f\u80fd\u8f7b\u677e\u4f7f\u7528\u3002
\u7f3a\u70b9\uff1a
1\u3001Visual Basic \u4e0d\u662f\u771f\u6b63\u7684\u9762\u5411\u5bf9\u8c61\u7684\u5f00\u53d1\u5de5\u5177\u3002
2\u3001Visual Basic \u7684\u6570\u636e\u7c7b\u578b\u592a\u5c11\uff0c\u800c\u4e14\u4e0d\u652f\u6301\u6307\u9488\uff0c\u8fd9\u4f7f\u5f97\u5b83\u7684\u8868\u8fbe\u80fd\u529b\u5f88\u6709\u9650\u3002
3\u3001Visual Basic \u4e0d\u662f\u771f\u6b63\u7684\u7f16\u8bd1\u578b\u8bed\u8a00\uff0c\u5b83\u4ea7\u751f\u7684\u6700\u7ec8\u4ee3\u7801\u4e0d\u662f\u53ef\u6267\u884c\u7684\uff0c\u662f\u4e00\u79cd\u4f2a\u4ee3\u7801\u3002\u5b83\u9700\u8981\u4e00\u4e2a\u52a8\u6001\u94fe\u63a5\u5e93\u53bb\u89e3\u91ca\u6267\u884c\uff0c\u8fd9\u4f7f\u5f97Visual Basic \u7684\u7f16\u8bd1\u901f\u5ea6\u5927\u5927\u53d8\u6162\u3002
\uff08Visual Basic 5\u4ee5\u53ca\u4ee5\u524d\u7684\u7248\u672c\u4ea7\u751f\u7684\u4ee3\u7801\u662f\u4f2a\u4ee3\u7801\uff0cVisual Basic 6 \u7f16\u8bd1\u51fa\u6765\u7684\u4ee3\u7801\u662f\u771f\u6b63\u7684\u53ef\u6267\u884c\u4ee3\u7801\u3002\uff09
\u53c2\u8003\u8d44\u6599\u6765\u6e90\uff1a\u767e\u5ea6\u767e\u79d1-\u7f16\u7a0b\u8bed\u8a00
集合运算中有补集、交集、并集的概念。
1、补集——若给定全集S,有A⊆ S,则A在S中的相对补集称为A的绝对补集(或简称补集),写作∁SA。
2、交集——集合论中,设A,B是两个集合,由所有属于集合A且属于集合B的元素所组成的元素,叫做子集A与集合B的交集(intersection),记作A∩B。
3、并集——若A和B是集合,则A和B并集是有所有A的元素和所有B的元素,而没有其他元素的集合。A和B的并集通常写作 "A∪B",读作“A并B”,用符号语言表示,即:A∪B={x|x∈A,或x∈B}。
绛旓細鎬荤粨锛欽ava锛氱綉椤碉紝浼佷笟绾у紑鍙戯紝鏅氬簲鐢ㄨ蒋浠讹紝娓告垙鍚庡彴銆2銆丆鍜孋 C/C鐞嗚涓婅鍙互鍋氫换浣曞紑鍙戯紝鍙鏈夊悎閫傜殑纭欢椹卞姩鍜孉PI锛岀壒鐐规槸鏁堢巼楂橈紝鍩烘湰涓婃槸缂栬瘧璇█閲岄潰鏁堢巼鏈楂樼殑銆傞櫎闈炰綘鐨勭郴缁涓繛C/C缂栬瘧鍣ㄩ兘涓嶅叿澶囥傛煇浜涚郴缁熷綋涓瑿缂栬瘧鍣ㄦ槸涓嶅叿澶囩殑锛屼絾鏄疌涓鑸兘鍏峰銆傜洰鍓嶈岃█锛孋璇█涓昏鐢ㄦ潵寮鍙戝簳灞傛ā鍧...
绛旓細浣犺濂藉鐩存帴鏄嬁java鎴栬卌#浣滀负绗竴闂缂栫▼璇█锛杩欎篃琛岋紝涓鑸潵璇磋繖浜涢潰鍚戝璞$殑璇█鍓嶉潰閮戒細浠嬬粛闈㈠悜杩囩▼鐨勪竴閮ㄥ垎锛屽悗闈㈠氨鏄粙缁嶉潰鍚戝璞′篃灏辨槸OOP鐨勬濇兂銆俢璇█鍏跺疄鏄綔涓轰竴闂ㄧ◢浣庡眰鐨勭紪绋嬭瑷锛寀nix/linux鎿嶄綔绯荤粺鐨勫簳灞傞儴鍒嗗氨鏄痗鍐欑殑锛屼綘璇村己澶т笉寮哄ぇ锛岃屼笖瀛﹀畬c璇█锛屽湪瀛++锛宩ava鍜宑#涔熼『閲屾垚...
绛旓細瀹冨彲浠ヤ綔涓虹郴缁熻璁¤瑷,缂栧啓宸ヤ綔绯荤粺搴旂敤绋嬪簭,涔熷彲浠ヤ綔涓哄簲鐢绋嬪簭璁捐璇█,缂栧啓涓嶄緷璧栬绠楁満纭欢鐨勫簲鐢ㄧ▼搴忋傚洜姝,瀹冪殑搴旂敤鑼冨洿骞挎硾銆 C璇█瀵规搷浣滅郴缁熷拰绯荤粺浣跨敤绋嬪簭浠ュ強闇瑕佸纭欢杩涜鎿嶄綔鐨勫満鍚,鐢–璇█鏄庢樉浼樹簬鍏跺畠瑙i噴鍨嬮珮绾ц瑷,鏈変竴浜涘ぇ鍨嬪簲鐢ㄨ蒋浠朵篃鏄敤C璇█缂栧啓鐨勩 C璇█鍏锋湁缁樺浘鑳藉姏寮,鍙Щ妞嶆,骞跺叿澶囧緢寮...
绛旓細Prolog - 澹版槑寮忕紪绋 锛堝彜钁o級Forth璇█ - 鍫嗘爤椹卞姩鐨勭紪绋嬶紙鑰佸彜钁o級APL - 鏁扮粍鎿嶄綔浠f暟 锛堣佸彜钁o級绗簩閮ㄥ垎锛岀幇鍦ㄦ渶濂藉涔犲摢浜缂栫▼璇█锛熷畠鐨勫唴瀹瑰張鏄粈涔堬紵鍓嶇 JS(JavaScript)褰撴偍鎵╁睍鎮ㄧ殑缃戠珯鏃讹紝JavaScript闈炲父瀹炵敤锛屽洜涓鸿繖绉嶈瑷鍙互鏋佸ぇ鍦板府鍔╂偍涓烘偍鐨勭綉绔欑敓鎴愰氫俊銆傛偍鍙互鍒╃敤JavaScript涓殑鍚勭...
绛旓細浠婂ぉ杩欑瘒鏂囩珷绛涢夊嚭涓浜涗富娴缂栫▼璇█,瀵硅瑷鐗规т笌鐜绋嶄綔浠嬬粛,甯屾湜鍙互甯姪鍒颁竴浜涚紪绋嬪垵瀛﹁呬笌鏈夊叴瓒e涔犵紪绋嬬殑鏈嬪弸,渚涘ぇ瀹朵簡瑙d笌閫夋嫨,灏戣蛋寮矾銆侸ava銆丆++銆丆#銆丳ython銆丳HP鈥︹﹀綋鐒,杩欎簺浠呮槸鎴戞帹鑽愮殑銆傛垜杩樺皢浠嬬粛鍏朵粬涓绘祦璇█涓庨備簬鍒濆鑰呭涔犵殑缂栫▼璇█涓庝竴浜涚紪绋嬪涔犳寚瀵笺侸ava,闈㈠悜瀵硅薄銆佸畨鍏ㄣ佽法骞冲彴銆佸己澶хǔ鍋...
绛旓細鎴戞暟瀛﹀緢宸,鑰屼笖鎴戝張鏄嚜瀛缂栫▼,鍦ㄥ紑濮嬪鍩虹C++鐨勬椂鍊欒繕娌℃湁澶氬ぇ鍥伴毦銆傘傚埌鍚庨潰瀛﹀埌浜嗗湪缂栫▼涓鏈...鍙互鍏堝涔犱竴浜涘鏂版墜鍙嬪ソ鐨璇█,姣斿Python銆乂B銆丆璇█,涓昏鏄敾鐐鑷劧璇█鎬濈淮鍒拌绠楁満璇█鎬濈淮鐨勮鎺...7. 鏈寰, 鎴戜細寤鸿浣犲厛瀛︿細鐢绘祦绋嬪浘鍜岃鍒掔▼搴, 鎵嶅幓鎯虫庡仛绋嬪簭, 杩為亾鐞嗛兘娌¤寰楅, 閭f槸缁濆...
绛旓細璁$畻鏈轰篃涓鏍,褰撲綘鎯宠璁$畻鏈轰负浣犲仛涓浠朵簨鎯呯殑鏃跺,璁$畻鏈烘湰韬苟涓嶈兘涓诲姩涓烘垜浠伐浣,鍥犳鎴戜滑蹇呴』瀵瑰畠涓嬭揪鎸囦护,鑰屽畠鏍规湰涓嶄細涔熶笉鍙兘鍚噦浜虹被鑷劧璇█瀵...杩欎箞楹荤儲,杩杩欎簺涓滆タ缂栫▼閮借鑰冭檻!鎬笉寰椾汉瀹惰缂栫▼濂介毦!浣犻敊浜,鍏跺疄璁稿杩欐牱鐨勬寚浠ら兘鏄幇鎴愮殑,鍖呭惈鍦ㄥ鐞嗚姱鐗囦腑鍐呯疆浜庢搷浣滅郴缁熶腑,鍥犳鎴戜滑涓嶅繀鎷呭績瀹冧滑宸ヤ綔...
绛旓細2銆佷唬鐮佺殑鍙噸鐢ㄦу樊锛氱敱浜庢槸闈㈠悜缁撴瀯鐨勭紪绋嬫柟寮忥紝骞朵笖娣峰悎html锛屾墍浠ュ彲鑳介〉闈㈠師鍨嬩慨鏀逛竴鐐癸紝鏁翠釜绋嬪簭閮介渶瑕佷慨鏀癸紝鏇村埆鎻愪唬鐮侀噸鐢ㄤ簡銆3銆佸急绫诲瀷閫犳垚娼滃湪鐨勫嚭閿欏彲鑳斤細灏界寮辨暟鎹被鍨嬬殑缂栫▼璇█浣跨敤璧锋潵鍥炴柟渚夸竴浜涳紝浣嗙浉瀵逛簬瀹冩墍閫犳垚鐨勫嚭閿欏嚑鐜囨槸杩滆繙寰椾笉鍋垮け鐨勩備互涓婃槸璇█鏈韩鐨勫急鐐癸紝鍦ㄥ姛鑳芥柟闈SP鍚屾牱瀛樺湪...
绛旓細ln(x)锛鑷劧瀵规暟 lg(x)锛氫互2涓哄簳鐨勫鏁 log(x)锛氬父鐢ㄥ鏁 floor(x)锛氫笂鍙栨暣鍑芥暟 ceil(x)锛氫笅鍙栨暣鍑芥暟 x锛歮od锛歽锛氭眰浣欐暟 {x}锛氬皬鏁伴儴鍒嗭細x锛-锛歠loor(x)鈭玣(x)未x锛氫笉瀹氱Н鍒 鈭玔a:b]f(x)未x锛歛鍒癰鐨勫畾绉垎 [P]锛歅涓虹湡绛変簬1鍚﹀垯绛変簬0 鈭慬1鈮鈮]f(k)锛氬n杩涜姹傚拰,...