C语言变量与指针

-地址 取地址的符号 &
-值 如果是指针类型的变量,可以用 * 来获取这个指针变量所指的变量的值;
** 可以快速获取取两级指针所指的值

#include 
 
int main ()
{
   int  V;
   int  *Pt1;
   int  **Pt2;
 
   V = 100;
 
   
   Pt1 = &V;
 
   
   Pt2 = &Pt1;
 
   
   printf("var = %pn", V );
	printf("&var = %pn", &V );
   printf("Pt1 = %pn", Pt1 ); 
	printf("&Pt1 = %pn", &Pt1 ); 
   printf("*Pt1 = %pn", *Pt1 ); 
   printf("Pt2 = %pn", Pt2 );
   printf("&Pt2 = %pn", &Pt2);
	printf("*Pt2 = %pn", *Pt2);
	printf("&Pt2 = %pn", &Pt2);
   printf("**Pt2 = %pn", **Pt2); 
 
   return 0;
}

结果如下:

var = 0x64
&var = 0x7fffc6fd3a9c
Pt1 = 0x7fffc6fd3a9c
&Pt1 = 0x7fffc6fd3a90
*Pt1 = 0x64
Pt2 = 0x7fffc6fd3a90
&Pt2 = 0x7fffc6fd3a88
*Pt2 = 0x7fffc6fd3a9c
&Pt2 = 0x7fffc6fd3a88
**Pt2 = 0x64