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int arr[10];
定义了一个数组arr
arr——（数组名）代表首元素地址
&arr[0]——也代表首元素地址
&arr——代表数组的地址
上述三个变量的值是相同的，但是第三个和前两个的含义不同。
int main() { int arr[10]; printf("%p\n", arr); printf("%p\n", &arr[0]);
printf("%p\n", &arr); return 0; }
含义的不同可以通过+1来体现。
首元素地址+1变成下一个元素的地址，而数组地址+1，则会跳过这个数组，到下一个位置。
下面通过代码演示一下：
int main() { int arr[10]; printf("%p\n", arr); printf("%p\n", &arr[0]);
printf("%p\n", &arr); printf("%p\n", arr+1); printf("%p\n", &arr[1]);
printf("%p\n", &arr + 1); return 0; }
前两个都是从D4变成D8，增加了4个字节
数组的地址从D4变成FC，增加了40个字节，刚好跳过该数组。
数组名在一般情况下是首元素的地址，但是有两个例外
1. 使用sizeof(arr)求数组长度——此时数组名并不代表首元素地址，而是代表整个数组
2.&arr不代表首元素地址，而是代表整个数组的地址。
如果使用sizeof(&arr),得到的结果是4个字节，因为求的就是这个地址占用的空间大小。
