索引结构中指针指向的数组

Question

看着我的Previous question。我用这组代码获得了解决方案

const MEMBERS *some_members = (MEMBERS *) GET_MEM();
unsigned value1 = some_members->mem1;
unsigned value2 = *some_members->mem2;

不按预期工作。但是在样本是

的情况下

unsigned sample [4] = {2,5,6,1};

如果需要从结构中对数组的第3个字符（即sample [3] = 1。）进行索引，如何在数组中进行索引。我也将value2作为指针吗？

谢谢大家..

Answer 1

在这种情况下，是的，使value2成为指针。即：

const MEMBERS *some_members = (MEMBERS *) GET_MEM();
unsigned value1 = some_members->mem1;
unsigned *value2 = some_members->mem2;

// These are true statements
value2[0] == 2;
value2[1] == 5;
value2[2] == 6;
value2[3] == 1;

Answer 2

可以访问指针和数组。

例如：

int array[4] = { 1, 2, 3, 4 };
printf("Third entry in array = %d\n", array[2]);

int *pointer = array;
printf("Third entry in array using pointer = %d\n", pointer[2]);

如果指针位于某个结构中并不重要，只需使用普通字段访问权限（例如structure.pointer[2]或structpointer->pointer[2]）。