- 指针仅仅是指向计算机中的某个地址，并带有类型限定符。
- 你可以对一个指针使用数组的语法来访问指向的东西，也可以对数组的名字做指针的算数运算。
- 你应该每次尽可能使用数组，并且按需将指针用作提升性能的手段。
无论怎么样，你都不应该把指针和数组混为一谈。它们并不是相同的东西，即使C让你以一些相同的方法来使用它们
除了sizeof、&操作和声明之外，数组名称都会被编译器推导为指向其首个元素的指针。对于这些情况，不要用“是”这个词，而是要用“推导”。
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数组与指针的关系
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| #include <stdio.h> | |
| int main(int argc, char *argv[]) | |
| { | |
| int ages[] = {23, 43, 12, 89, 2}; | |
| char *names[] = {"Alan", "Frank", "Mary", "John", "Lisa"}; | |
| int count = sizeof(ages) / sizeof(int); | |
| int i; | |
| // 1. 最原始的方式：通过数组+下标访问 | |
| for (i = 0; i < count; i++) | |
| { | |
| printf("%s has %d years alive.\n", | |
| names[i], | |
| ages[i]); | |
| } | |
| printf("-------------------\n"); | |
| int *cur_age = ages; | |
| char **cur_name = names; | |
| // 2. 通过对直接进行偏移访问元素 | |
| for (i = 0; i < count; i++) | |
| { | |
| printf("%s is %d years alive.\n", | |
| *(cur_name + i), | |
| *(cur_age + i)); | |
| } | |
| printf("-------------------\n"); | |
| // 3. 把数组直接作为指针来访问 | |
| for (i = 0; i < count; i++) | |
| { | |
| printf("%s has %d years alive.\n", | |
| cur_name[i], | |
| cur_age[i]); | |
| } | |
| printf("-------------------\n"); | |
| // 4. 通过对进行运算来访问 | |
| for (cur_name = names, cur_age = ages; | |
| (cur_age - ages) < count; | |
| cur_age++, cur_name++) | |
| { | |
| printf("%s is %d years alive.\n", | |
| *cur_name, | |
| *cur_age); | |
| } | |
| return 0; | |
| } |
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