C语言 多重指针--整型字符字符串 int**pp

介绍

多重指针:一个指针指向另一个指针

离值越近的指针级别越大:一级

内存布局

代码

图示:

多重指针–整型

#include<stdio.h>#include<string.h>//多重指针--整型//二级指针void two(){printf("二级指针:\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);}//三级指针void three(){printf("三级指针:\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;}

多重指针–字符

#include<stdio.h>#include<string.h>//多重指针--字符//二级指针void two(){printf("二级指针:\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);}//三级指针void three(){printf("三级指针:\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;}

多重指针–字符串

#include<stdio.h>#include<string.h>//多重指针--字符串//三级指针void two(){printf("三级指针:\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 根本没有存储"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;}