{"id":552688,"date":"2022-01-20T09:02:20","date_gmt":"2022-01-20T01:02:20","guid":{"rendered":"http:\/\/4563.org\/?p=552688"},"modified":"2022-01-20T09:02:20","modified_gmt":"2022-01-20T01:02:20","slug":"%e5%a4%a7%e9%87%8f-if-else-%e7%9a%84%e5%87%bd%e6%95%b0%e9%87%8d%e6%9e%84-3","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=552688","title":{"rendered":"\u5927\u91cf if-else \u7684\u51fd\u6570\u91cd\u6784"},"content":{"rendered":"
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\u5927\u91cf if-else \u7684\u51fd\u6570\u91cd\u6784 <\/h1>\n

<\/p>\n

\n
\u8cc7\u6df1\u5927\u4f6c : linquan <\/span> <\/i> 27<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
\u8bed\u8a00\u662f c#\uff0c\u4ee3\u7801\u4e2d\u6709\u5f88\u591a if-else \u7684\u5224\u65ad\u8bed\u53e5\uff0c\u5c31\u50cf\u8fd9\u6837\uff1aif (x==1) then func1… if (x==2) then func2… …\u50cf\u8fd9\u6837\u6709\u51e0\u5341\u4e2a\u3002\u867d\u7136\u770b\u8d77\u6765\u8fd8\u7b97\u6e05\u695a\uff0c\u4f46\u662f\u60f3\u7528\u4e00\u79cd\u66f4\u52a0\u9ad8\u6548\u7387\u7684\u65b9\u5f0f\u5b8c\u6210\uff0c\u80fd\u591f\u51cf\u5c11\u4ee3\u7801\u91cf\uff0c\u6216\u8005\u63d0\u9ad8\u8fd0\u884c\u901f\u5ea6\u3002\u76ee\u524d\u60f3\u5230\u7684\u662f\u505a\u4e00\u4e2a x \u548c func \u7684\u6620\u5c04\uff0c\u4f8b\u5982 map \u7b49\uff0c\u7136\u540e\u8fd9\u6837\u65f6\u95f4\u590d\u6742\u5ea6\u5c31\u53d8\u6210\u4e86 logn \u3002\u8bf7\u95ee\u6709\u6ca1\u6709\u66f4\u597d\u7684\u65b9\u6cd5\uff1f <\/div>\n
\u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (26<\/span>) <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n
    \n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : Morii <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    1.\u7b56\u7565\u5de5\u5382
    2.\u6a21\u677f\u65b9\u6cd5
    3.\u8d23\u4efb\u94fe <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : ysc3839 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    x \u6bd4\u8f83\u8fde\u7eed\u7684\u8bdd\u76f4\u63a5\u7528\u6570\u7ec4\uff0c\u590d\u6742\u5ea6\u5c31\u662f O(1) \u4e86\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : ipwx <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u5982\u679c\u662f\u6574\u6570\uff0c\u53ef\u4ee5\u7528 switch \u3002\u7f16\u8bd1\u5668\u53ef\u80fd\u5e2e\u4f60\u76f4\u63a5\u8f6c\u6362\u6210\u8df3\u8868\uff08\u67e5\u8868\uff09\uff0c\u4e5f\u662f O(1) \u7684\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : zxlzy <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    map \u7684\u65f6\u95f4\u590d\u6742\u5ea6\u662f 1 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : Jooooooooo <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u8fd9…\u9664\u975e\u662f\u6709\u4e0a\u4e07\u4e2a, \u4e00\u822c\u4e0d\u8003\u8651\u8fd9\u79cd\u6027\u80fd\u635f\u8017.
    \u4ece\u53ef\u8bfb\u6027\u7684\u89d2\u5ea6\u51fa\u53d1\u4f18\u5316\u5427. <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : shijieheping <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u8868\u9a71\u52a8\uff0c\u903b\u8f91\u4e0e\u6570\u636e\u5206\u79bb <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : linquan <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @zxlzy \u8fd9\u4e2a\u6211\u4e5f\u633a\u61f5\u903c\u7684\uff0c\u5728 c++\u597d\u50cf\u662f hashmap \u590d\u6742\u5ea6 1 \uff0c\u76f4\u63a5\u7528\u54c8\u5e0c\u51fd\u6570\u5b9e\u73b0\uff1b map \u7528\u7ea2\u9ed1\u6811\uff0c\u590d\u6742\u5ea6 logn <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : villivateur <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u5982\u679c\u662f c \u7684\u8bdd\uff0c\u53ef\u4ee5\u8003\u8651\u7ed3\u6784\u4f53\u6570\u7ec4+\u51fd\u6570\u6307\u9488\u3002
    C#\u5e94\u8be5\u53ef\u4ee5\u76f4\u63a5\u7528\u5b57\u5178\u5b9e\u73b0\u5427\uff1f <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : DTCPSS <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    C#8 \u6709\u6a21\u5f0f\u5339\u914d switch\uff1a
    https:\/\/docs.microsoft.com\/zh-cn\/dotnet\/csharp\/language-reference\/operators\/switch-expression <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : fregie <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u903b\u8f91\u6e05\u695a\u548c\u7b80\u5355\u624d\u662f\u4e00\u4e2a\u4e2d\u5927\u578b\u8f6f\u4ef6\u5de5\u7a0b\u6700\u9ad8\u4f18\u5148\u7ea7\uff0c\u6ca1\u5fc5\u8981\u7684\u9ad8\u6548\u7387\u548c\u4f4e\u4ee3\u7801\u91cf\u53ea\u4f1a\u5f92\u589e\u9879\u76ee\u7684\u7ef4\u62a4\u6210\u672c\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : DTCPSS <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    “`
    async Task DoSomething(Direction direction)
    {
    Task task = direction switch
    {
    Direction.Up => GoNorthAsync(),
    Direction.Right => GoEastAsync(),
    Direction.Down => GoSouthAsync(),
    Direction.Left => GoWestAsync(),
    _ => throw new ArgumentOutOfRangeException(nameof(direction), $”Not expected direction value: {direction}”),
    };
    await task;
    }
    “` <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : telung <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u91cd\u6784 if else \u5e76\u4e0d\u80fd\u63d0\u9ad8\u4ee3\u7801\u8fd0\u884c\u901f\u5ea6 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : BeautifulSoap <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    lz \u4f60\u8fd9\u60f3\u6cd5\u4e0d\u5c31\u662f\u8868\u9a71\u52a8\u5417\uff0c\u8fd9\u4e48\u505a\u6ca1\u95ee\u9898\u7684 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : lightjiao <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u522b\u641e\u90a3\u4e48\u591a\u62bd\u8c61\uff0c\u6c42\u6c42\u4e86\uff0c\u6211\u4eec\u9879\u76ee\u4ee3\u7801\u4e03\u516b\u5c42 OOP \u770b\u5410\u4e86
    \u53ea\u8981\u4e0d\u662f\u90a3\u79cd\u4f4e\u6548\u7387\u6216\u8005\u5b8c\u5168\u6ca1\u6709\u62c6\u5206\u51fd\u6570\u7684 if else \uff0c\u6ca1\u5565\u6bdb\u75c5\u554a\uff0c\u9605\u8bfb\u8d77\u6765\u7b80\u5355\uff0c\u597d\u7ef4\u62a4\uff0c\u8fd0\u884c\u6548\u7387\u6709\u4fdd\u8bc1\uff0c\u8fd8\u8981\u5565\u81ea\u884c\u8f66 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : Cloutain <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    switch \u4e0d\u5c31\u884c\u4e86 \u8fd8\u7528\u5565 map \uff0cswitch \u4e0b\u8981\u4e48\u53d8\u8df3\u8f6c\u8868\uff0c\u8981\u53d8\u7d22\u5f15\u8868\uff0c\u8981\u4e48\u53d8\u6811\uff0c\u5145\u5206\u5229\u7528\u7f16\u8bd1\u5668\u7684\u7279\u6027 \u4e0d\u8981\u81ea\u5df1\u6298\u817e <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : wizzer <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u597d\u597d\u4f18\u5316\u4e1a\u52a1\u5b9e\u73b0\uff0c\u4e0d\u6bd4\u4f18\u5316\u6389 if else \u66f4\u80fd\u63d0\u5347\u6027\u80fd\uff1f <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : OysterQAQ <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    if else \u6bd4\u4f60\u8bf4\u7684\u4ec0\u4e48 map \u5feb\u591a\u4e86\uff0c\u4e0d\u662f\u4e00\u4e2a\u91cf\u7ea7\uff0c==\u5728\u6c47\u7f16\u5c31\u4e00\u53e5\u8bdd \u5bf9\u5e94\u673a\u5668\u7ea7\u522b\u7684\u4e00\u6761\u4e8c\u8fdb\u5236\u6307\u4ee4 \u7136\u540e\u6839\u636e\u7ed3\u679c\u65e0\u6761\u4ef6\u8df3\u8f6c \u63d0\u5347\u8fd0\u884c\u901f\u5ea6\u662f\u4e0d\u53ef\u80fd\u7684 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : ipwx <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @OysterQAQ \u4f60\u8bf4\u9519\u4e86\u5427\uff0cswitch-case \u624d\u662f\u8df3\u8868\u3002\u3002\u3002\u3002if-else \u4e32\u8054 1000 \u4e2a\u90a3\u8fd8\u662f\u5f97\u6162\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : OysterQAQ <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u57fa\u672c\u4efb\u4f55\u5bf9\u4e8e\u5de5\u7a0b\u6027\u7684\u4f18\u5316\u90fd\u4e0d\u4f1a\u63d0\u9ad8\u8fd0\u884c\u901f\u5ea6\uff0c\u4f8b\u5982 magic \u6570\uff0c\u7acb\u5373\u6570\u80af\u5b9a\u662f\u6bd4\u5176\u4ed6\u5bfb\u5740\u65b9\u5f0f\u5feb\u5f97\u591a\u7684\u3002\u591a if else \u9700\u8981\u8003\u8651\u5bf9\u4e8e\u5de5\u7a0b\u6027\u4e0a\u7684\u4f18\u5316\uff0c\u4ee3\u7801\u7684\u53ef\u8bfb\u6027 \u53ef\u7ef4\u62a4\u6027 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : OysterQAQ <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @ipwx \u4f60\u8bf4\u7684\u5bf9 if \u4e32\u8054\u662f\u4f1a\u591a\u6b21\u5224\u65ad\uff0c\u6211\u662f\u8bf4 if\/switch \u4e00\u6b21\u5224\u65ad\u548c map \u4e00\u6b21\u6620\u5c04\u7684\u6bd4\u8f83 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : MatDK <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u4f60\u53ef\u4ee5\u505a 1 \u4e2a functionarray[n]={func0,func1,….\/}
    \u7136\u540e\u6309\u76f4\u63a5 functionarray[x](params)\u5c31\u884c\u4e86…. <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : PiersSoCool <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u521a\u5de5\u4f5c\uff1a\u4e0d\u77e5\u9053
    \u5de5\u4f5c 1 \u5e74\uff1a\u7b56\u7565\u6a21\u5f0f
    \u5de5\u4f5c N \u5e74\uff1a\u53ea\u8981\u80fd\u770b\u61c2\uff0c\u5199\u8d77\u6765\u4e0d\u9ebb\u70e6\u5c31\u884c <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : kisshere <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    [Imgur]( https:\/\/imgur.com\/eG6Je61) <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : DrakeXiang <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u4e0d\u8003\u8651\u6027\u80fd\uff0c\u51e0\u5341\u4e2a if else \u6211\u770b\u7740\u4e5f\u53d7\u4e0d\u4e86\u3002\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : tool2d <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u51fd\u6570\u91cc\u5149\u662f\u591a\u4e2a if \uff0c\u4ee3\u7801\u4e5f\u633a\u597d\u7406\u89e3\u7684\u3002
    \u5c31\u662f else \u5fc5\u987b\u5c11\u7528\u3002
    C++\u4f1a\u628a\u5927\u578b switch case \u4f18\u5316\u6210\u4e8c\u5206\u67e5\u627e\uff0c\u76f8\u5f53\u4e8e map \u7684 logn \uff0c\u4f46\u662f\u6055\u6211\u76f4\u8a00\uff0c\u8fd9\u5bf9\u6027\u80fd\u538b\u6839\u4e0d\u91cd\u8981\u3002\u9664\u975e\u4ee3\u7801\u662f\u81ea\u52a8\u751f\u6210\u7684\u51e0\u767e\u51e0\u5343\u4e2a IF \uff0c\u90a3\u53e6\u8bf4\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : c0xt30a <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u5bf9\u6211\u6765\u8bb2\uff0c\u8fd9\u6837\u76f4\u767d\u7684\u4ee3\u7801
    “`
    int func( int i )
    {
    return i == 1 ? func1( i ) :
    i == 2 ? func2( i ) :
    i == 3 ? func3( i ) :
    i == 4 ? func4( i ) :
    i == 5 ? func5( i ) :
    0;
    }
    “`
    \u6bd4\u903b\u8f91\u4e0e\u6570\u636e\u5206\u79bb\u7684\u8868\u9a71\u52a8\u4ee3\u7801\u66f4\u597d\u4e00\u70b9\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n","protected":false},"excerpt":{"rendered":"

    \u5927\u91cf if-else \u7684\u51fd\u6570\u91cd\u6784 …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/552688"}],"collection":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=552688"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/552688\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=552688"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=552688"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=552688"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}