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コバにゃんチャンネル By コバにゃんチャンネル

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コバにゃん☆です?
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大象中醫 By 大象中醫

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長照是一個劇變的旋轉舞台 百年難得一見 沒有準備的人 被旋轉舞台甩出去 不是坐下就是躺下 而大象中醫是太極的推手 推動著旋轉舞台 讓 所有爬不起來的人 背後有一股推手力量 支撐再站起來
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expected ';' before 在 大象中醫 Youtube 的最佳解答

大象中醫 By 大象中醫

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長照是一個劇變的旋轉舞台 百年難得一見 沒有準備的人 被旋轉舞台甩出去 不是坐下就是躺下 而大象中醫是太極的推手 推動著旋轉舞台 讓 所有爬不起來的人 背後有一股推手力量 支撐再站起來
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expected ';' before 在 [問題] expected primary-expression before '.' token 的推薦與評價


作者luckychild (兌現承諾)
看板C_and_CPP
標題[問題] expected primary-expression before '.' token
時間Wed Dec 9 11:22:39 2009

遇到的問題： (題意請描述清楚)

class"B"的 public data member vector<double> *f
而main內有個函式 A(vector<double> &)
我這樣做 A(*(*B.f))

程式跑出來的錯誤結果：

expected primary-expression before '.' token

開發平台： (例: VC++ or gcc/g++ or Dev-C++, Windows or Linux)

Dev-C++

有問題的code： (請善用置底文標色功能)


補充說明：

請指正我的程式觀念,我不知道該怎麼改...
謝謝囉.

--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 140.120.11.174
推 VictorTom:B是指標嗎?? 是就A(*((*B).f)), 不是就A(*(B.f))試試@@" 12/09 11:51
→ VictorTom:前者A(*(B->f))應該也行; 不是這個問題的話就不知了@@" 12/09 11:51
推 AstralBrain:就error message看來.. B是class name 12/09 11:55
→ AstralBrain:non-static member要有一個instance才能用 12/09 11:56
→ AstralBrain:所以要 B b; A(*b.f); 這樣 12/09 11:57
→ tinlans:class name 又不是 primary-expression，你沒查語法表嗎。 12/09 12:10

什麼語法表,我不是資工相關科系的,所知道的資源比較少.


我犯了低級錯誤.
我有class B.在main內我忘記打上物件的名稱就這樣用

B (...........); 但可以compile,我也就找不到錯誤在這了

這樣compiler不會告訴我錯了喔!? 為什麼呢?

應該這樣才對 B b(...................);

謝謝大家熱心回覆.
※ 編輯: luckychild 來自: 140.120.11.174 (12/09 12:39)
→ tinlans:B(xxx) 是合法的啊，意思是造出一個臨時物件。 12/09 14:40
→ tinlans:程式語言跟 BNF 的看法在大一計概會教吧，沒學到要罵老師 12/09 14:42
→ tinlans:，我記得以前很多非資工系的計概亂教，學生去考預官計概死 12/09 14:43
→ tinlans:很慘才知道要回學校罵老師亂教 XD 12/09 14:43
推 VictorTom:外系的大一資概有半學期一學期都在教office之類的吧XD 12/09 15:15
→ MOONRAKER:前台北教大校長莊某當年在某淡字學校開的資概也差不多 12/09 16:29






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expected ';' before 在 Error: expected primary-expression before ';' token - YouTube 的推薦與評價

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#64. [問題] expected primary-expression before '.' token

遇到的問題： (題意請描述清楚) class"B"的public data member vector *f 而main內有個函式A(vector &) 我這樣做A(*(*B.f)) 程式跑出來的錯誤結果：