本文介绍了为什么多行宏在每行末尾都有反斜杠?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
在宏声明中,例如:
#define WAIT_SPI2_TRANSMISSON_END() {while ((SPI2_SR & SPI_SR_TXCTR_MASK) != 0) {\ if( SPI2_SR & SPI_SR_RFDF_MASK ) {\ (void)SPI2_POPR;\ SPI2_SR |= SPI_SR_RFDF_MASK ;\ }}\这些反斜杠( \ )是什么意思或
What do these backslashes (\) mean or do there?
推荐答案这是行继续符。
有
它对宏特别有用,因为它增加了清晰度。
It's particularly useful for macros as it adds clarity.
b $ b
(非常偶尔-尤其是在旧代码中,您会看到 trigraph序列 ?? / 代替 \ 。这些天,虽然这更多是面试官的技巧
(Very, very occasionally - especially in old code - you'll see the trigraph sequence ??/ in place of \. These days though it's more of an interviewers' trick question.)
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为什么多行宏在每行末尾都有反斜杠?
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