“*”的几种用途

1. 乘法运算符

   int x = 1;
   int y = 2;
   int z = x * y;

2. 定义新的类型

   char x;
   char* x;

3. 取值运算符

   • • 指针类型的变量
       int* a =(int*)1;
       printf("%x \n",(a +1));
       10: int a =(int*)1;
       00401028 mov dword ptr [ebp-4],1
       11: printf("%x \n",*(a +1));
       0040102F mov eax,dword ptr [ebp-4]
       00401032 mov ecx,dword ptr [eax+4]
       00401035 push ecx
       00401036 push offset string "%x \n" (0042201c)
       0040103B call printf (00401070)
       00401040 add esp,8
       当然这里运行的时候肯定出错 因为 1 是一个异常的不存在的地址

探测 * 指针类型 的类型

int*** a;
int***** b;
int******* c;
int* d;
//int x = *(a+1);
//int x = *(b++);
//int x = *(c-5);
//int x = *(d+6);
//总结
//    *加指针类型 的类型是 指针类型减去一个*

取值运算符举例

int x=1;                        int x =1;
int* p = &x;                    int* p = &x;
printf("%x %x \n",p,*(p));      int** p2 = &p;
*(p)=2;                         int*** p3 = &p2;
printf("%d \n",x);              int r = *(*(*(p3)));
                                printf("%d \n",r);

Q.E.D.