在指针声明中放置星号 [英] Placement of the asterisk in pointer declarations

问题描述

我最近决定我最终只需要学习 C/C++，关于指针，或者更准确地说，我不太了解它们的定义.

I've recently decided that I just have to finally learn C/C++, and there is one thing I do not really understand about pointers or more precisely, their definition.

这些例子怎么样:

1. int* test;
2. int *test;
3. int * test;
4. int* test,test2;
5. int *test,test2;
6. int * test,test2;

现在，据我所知，前三种情况都在做同样的事情:Test 不是一个 int，而是一个指向 1 的指针.

Now, to my understanding, the first three cases are all doing the same: Test is not an int, but a pointer to one.

第二组例子有点棘手.在情况 4 中，test 和 test2 都是指向 int 的指针，而在情况 5 中，只有 test 是一个指针，而 test2 是一个真正的"int.案例6呢?和案例5一样吗?

The second set of examples is a bit more tricky. In case 4, both test and test2 will be pointers to an int, whereas in case 5, only test is a pointer, whereas test2 is a "real" int. What about case 6? Same as case 5?

推荐答案

4, 5, 6 是同一个东西，只有 test 是一个指针.如果你想要两个指针，你应该使用:

4, 5, and 6 are the same thing, only test is a pointer. If you want two pointers, you should use:

int *test, *test2;

或者，甚至更好(让一切都清楚):

Or, even better (to make everything clear):

int* test;
int* test2;

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