sizeof的优先级

本文介绍了sizeof的优先级的处理方法，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

sizeof与演员阵容具有相同的优先级，并且他们都从右边绑定到 左边。以下不能用gcc为我编译： int main（无效） { sizeof（double） 5; 返回0; } 它是否与globbing有关？ - Frederick Gotham

sizeof has the same precedence as a cast, and they both bind from right to left. The following won''t compile for me with gcc: int main(void) { sizeof(double)5; return 0; } Has it got something to do with "globbing"? -- Frederick Gotham

推荐答案

10月6日晚9点39分，Frederick Gotham< fgotha ... @ SPAM写道： On Oct 6, 9:39 pm, Frederick Gotham <fgotha...@SPAMwrote: sizeof具有与演员相同的优先级，并且它们都从右边绑定到 左边。以下不能用gcc为我编译： int main（无效） { sizeof（double） 5; 返回0; } 它是否与globbing有关？ - Frederick Gotham sizeof has the same precedence as a cast, and they both bind from right to left. The following won''t compile for me with gcc: int main(void) { sizeof(double)5; return 0; } Has it got something to do with "globbing"? -- Frederick Gotham

" sizeof（（double ）5）"效果很好。

"sizeof ((double)5)" works well.

Cong Wang写道： Cong Wang wrote: 10月6日晚9点39分，Frederick Gotham< fgotha ... @ SPAM写道： On Oct 6, 9:39 pm, Frederick Gotham <fgotha...@SPAMwrote: sizeof与演员阵容具有相同的优先级，他们俩都是从右边绑定到 离开。以下不能用gcc为我编译： int main（无效） { sizeof（double） 5; 返回0; } 它是否与globbing有关？ - Frederick Gotham sizeof has the same precedence as a cast, and they both bind from right to left. The following won''t compile for me with gcc: int main(void) { sizeof(double)5; return 0; } Has it got something to do with "globbing"? -- Frederick Gotham

" sizeof（（double ）5）"效果很好。

"sizeof ((double)5)" works well.

Cong Wang发布： Cong Wang posted: " sizeof（（double）5）"效果很好。 "sizeof ((double)5)" works well.

是的，我意识到了。我的问题涉及运算符优先级和 关联性 - 具体来说，原因： sizeof（double）5 被gcc解释为： （sizeof（double））5 而不是： sizeof（（double）5） - Frederick Gotham

Yes, I realise that. My question pertains to operator precedence and associativity -- specifically, why: sizeof(double)5 is interpretted by gcc as: (sizeof(double))5 rather than: sizeof((double)5) -- Frederick Gotham