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c-faq review and a chinese translation (1.12) February 15, 2007

Posted by TSAI HONG-BIN in Programming.

please refer to http://c-faq.com/decl/auto.html for original document.

1.12 What’s the auto keyword good for?

Nothing; it’s archaic. [One can imagine stylistic uses such as emphasizing that a variable must be automatic, and supposedly some compilers have used it to force a variable not to be in a register.] (It’s a holdover from C’s typeless predecessor language B, where in the absence of keywords like int a declaration always needed a storage class.) See also question 20.37.


關鍵字 auto 有什麼好處

沒有,那已廢棄不用。auto可以做為字面上強調該變數必需為自動(automatic),也許某些編輯器以此來強迫變數不要存放在register裡。C語言的前身B語言沒有類似 int 的關鍵字,因此用auto來做 storage class。




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