介紹

多重指針:一個指針指向另一個指針
離值越近的指針級別越大:一級

內存布局

代碼

圖示:

多重指針–整型

#include<stdio.h>
#include<string.h>
//多重指針--整型//二級指針
void two()
{printf("二級指針:\n");int a=896;int *p=&a,**pp=&p;printf("a=%d self-address=%p\n",a,&a);printf("a=%d address=%p self-address=%p\n",*p,p,&p);printf("a=%d address=%p self-address=%p\n",**pp,pp,&pp);
}//三級指針
void three()
{printf("三級指針:\n");int a=57877777;int *p=&a,**pp=&p,***ppp=&pp;printf("a=%d self-address=%p\n",a,&a);printf("a=%d address=%p self-address=%p\n",*p,p,&p);printf("a=%d address=%p self-address=%p\n",**pp,pp,&pp);printf("a=%d address=%p self-address=%p\n",***ppp,ppp,&ppp);
}int main()
{two();three();getchar();return 0;
}

多重指針–字符

#include<stdio.h>
#include<string.h>
//多重指針--字符//二級指針
void two()
{printf("二級指針:\n");char a='i';char *p=&a,**pp=&p;printf("a=%c self-address=%p\n",a,&a);printf("a=%c address=%p self-address=%p\n",*p,p,&p);printf("a=%c address=%p self-address=%p\n",**pp,pp,&pp);
}//三級指針
void three()
{printf("三級指針:\n");char a='y';char *p=&a,**pp=&p,***ppp=&pp;printf("a=%c self-address=%p\n",a,&a);printf("a=%c address=%p self-address=%p\n",*p,p,&p);printf("a=%c address=%p self-address=%p\n",**pp,pp,&pp);printf("a=%c address=%p self-address=%p\n",***ppp,ppp,&ppp);
}int main()
{two();three();getchar();return 0;
}

多重指針–字符串

#include<stdio.h>
#include<string.h>
//多重指針--字符串//三級指針
void two()
{printf("三級指針:\n");char *a="hello world";char **p=&a,***pp=&p;printf("c=%c a=%s self-address=%p\n",*a,a,&a);//char **p=&a=a的地址  根本沒有存儲"hello world"的地址,不能使用 %s pprintf("a=%s address=%p self-address=%p\n",a,p,&p);printf("a=%s address=%p self-address=%p\n",a,pp,&pp);
}int main()
{two();getchar();return 0;
}